holley sniper starts and dies

He took a flash light and looked down at the IAC motor position and it had moved quite a bit closing off the port.Now I had to try this and of course my results were not so lucky. Read the instructions and Follow them. Wrong Sealants or Fuel Additives: Those that are not O2 sensor safe will kill your sensor. Goat Rope Garage 76.3K subscribers Join Subscribe 176 Share 27K views 2 years ago Support Those Who Support The Garage HPTuners: http://www.hptuners.com Show. Thank you for your insight! Price Point: $$$. My question is if both of my fuel pumps are wired from relays to my rocker panel where does the blue fuel pump prime wire connect or would you just not use it altogether. Price Point: $$$. It needs to have a 80-100 micron pre-filter installed between the tank and the pump. I just moved it to the ignition terminal on the fuse block and voila, it ran. Avoid using any 90 degree fittings between the tank and pump. Would love some feedback as what I need to do to help my issue. More on that later. If it cranks better then you know you're getting too much fuel. Both of these are easily corrected. (If the Sniper does not get a RPM signal, it will not inject fuel.). Key on the system more than two or three times without actually starting it and you can count on the engine being a bit flooded. Once engine is warmed up been driving for awhile. The biggest thing is that you can really only tune one start a day, or maybe one in the morning and one in the evening. If you have any exhaust leaks between the combustion chamber and 18-24 after the sensor you are going to have problems. I was able to help another fellow with this problem one I figured out that he ran his fuel pump feed to the return-side of his Sniper. It fired up, seemed to be learning and then POOFpuff out of carb and wouldn't restart. Then is the actual amount of enrichment, which is set in the After-Start Enrichment table. Cranking fuel lets us compensate for that drop in pressure. Not bad but maybe we can improve that. Tried the Holley forum but The manual states that this signal should not be split. Pin 85: To Ground For the Sniper it is best to run resistor plugs. Cheers Darren. Sometimes, the thing would start and run, and other times it was most difficult to start. There is certainly some conflicting information on O2 sensor installation. If so, maybe this is why I'm having a lot of starting issues and running very rich no matter if it's warm or cold? Any tips or info on cold starts? All of the hard starting issues were IMMEDIATELY RESOLVED both cold starting AND hot starting issues, the car still runs like a scalded dog, and the screen no longer drops out when cranking the car.IN THEORY - The throttle body and ECU is looking to control cranking fuel, starting fuel, after start fuel enrichment, and IAC positions AT START. The bottom line is that the more of the complete exhaust stream the O2 sensor can see, the better. Is a tremendous volume of fuel sprayed in all barrels? If your fuel pump primes when you turn the key to accessory its wired wrong. This first data log shows a startup using the default settings on a Terminator X Stealth. Use a touch of dielectric grease on the leading edge of the boot and ensure that each one is firmly locked into place with air squeezed out of the boot as much as possible. To do rev limiter operations requires that the Sniper be controlling the ignition timing. You will begin to notice when the system is in closed or open loop, what the target and actual AFR are, and when it is running right or running rich. Great work! multi-port EFI systems And with each pulse of fuel until the pump starts again at the crank-to-run RPM, the pressure drops further. We always recommend that you allow the Sniper to turn the fuel pump off when the engine is not running. Everyone else was backordered several months. That's a spread of 200 degrees so half of that would be 100 degrees. The engine warms up a bit each time. That delay is called After-Start Holdoff. 02/23/2023. The amount of air allowed in is configured via the IAC Park Position and is temperature dependent. Maybe Holley will add Fuel Prime Multiplier to Terminator X later. to zero, but I think you'll find that you will stall. Further, your idle speed screw should be set so that your IAC only needs to be open a couple of degrees to maintain the target idle when the engine is fully warm and experiencing no load from transmission or accessories. Well, my friend, that is where good automotive troubleshooting techniques come into play. Only thing I have done since last Wednesday was add Holley EFI gauges. This happens with some carburetors on dual planes as well. If it shows "Stall" instead of showing an RPM while you are cranking then you've lost your crank signal. Find a lower price anywhere and we'll beat it by 5%! Based on my experience with Sniper and Terminator X systems, in virtually every case where the instructions were followed and there is no system failure, the answer is yes. The challenge will be what you call the "right fuel system". This page was generated at 05:08 PM. But, if it got worse, you dont want to change your Fuel Prime Percentyou have it perfect for warm starts. Figure out what it's not getting and the find out why. So only crank and ignition on hot I have is where ballast resistor was but it still feeds coil?Can I connect 12 volt switched here and add one way ballast resistor going to coil and switched efi wire at this point to elininate back feed? Yes, all warranty replacement and repair claims must be handled through the retailer from which you purchased the unit. We do see a massive rich dip in the AFR as soon as engine starts. Only thing Im really looking for is an AFR of 14.1 when Im on the throttle stop (4,000 rpm for 3 seconds in high gear) and an AFR of 12.8 to 13.0 everywhere else. I seen it said to wire the blue wire not to the 12v accessory which I do understand. One thing I miss is the instant drop in rpms that my 650DP had. I have a aeromotive stealth 340 fuel tank. I have a sniperstealth witch dui ignition and Holley in tank pump. Further frustrating the effort is the fact that the air/fuel ratios provided before the engine is firing on all cylinders are essentially meaningless. If you're getting in the 10's your asking for issues. Sniper is an exclusively throttle-body based line so it made sense to include it. So now youre left with tuning the Fuel Prime Multiplier. 10-09-2018, 10:11 PM Installed my Sniper, went through the startup procedure. Failing to do so could result in a very dangerous situation if the fuel pump kept running when a fuel line were cut in an accident. If you're installing a Sniper EFI system and almost ready to crank it over for the first time, this is the video for you! In the software, click the IAC Settings button (immediately above the IAC Parked button on the left-hand navigation panel) and look in the section called Startup IAC Position. Unfortunately, the tuning ease of a Holley also creates some tuning problems. As a result, this same engine may not start well cold. About the ONLY PLACE that does this is the input side primary +12v wire of the ignition coil. If you turn the ignition off and back on, & crank it, it will start & die again. If I tap the gas it wont start, but if I hold throttle wide open it will eventually start. Stay up to date with the latest releases, events, promotions and more. I was wondering if you could help out? Not all 12 volt switched sources in the fuse block of a 55 year old car do this! I'm glad that worked for you! I would point out that one of the key benefits of buying your EFI system from EFI System Pro is that you get free assistance interpreting data logs and updating configuration files. Too much and it will simply idle high and can be manually adjusted down. Air is not just coming into the engine via the throttle blades. While continuing to observe the barrels, crank the engine. You should then have at least 18-24 of pipe after the sensor. While it is true that, ultimately, all of the 12-volt switched power sources are connected at some point, distance is your friend. Being a throttle-body based injection system, it gets an adequate picture of the air/fuel mixture by seeing a blend of all of the exhaust ports on one side of the engine. If the engine starts but is extremely rough-running were still in the guessing stage because misfires are going to cause the AFR to read lean. Are you running timing control? Some good info here thank you. From what I read it should not be installed vertically? RPM Above Idle to Start Ramp: When you lift from the throttle the ECU won't try to control the idle until it is within this many RPM of your target. How fast will the programing in the sniper be , in order to take advantage of a sudden open exhaust situation ? The engine starts and idles great. ), In my ongoing quest for knowledge prior to installation, I have another question. In fact, MOST of the points on the fuse block don't do that! Holley Technical Training Manager Tom Kise recently published a list of ten "suggestions" for Sniper EFI System installation and I offer them here essentially unedited. You just have to go one direction and see if things improve or not. Unfortunately, I know NOTHING about throttle stops. Holley's Dominator and I am now awaiting my new Sniper Stealth 4150 to install on my 1968 Corvette 427. The Sniper ships with an OEM grade Bosch O2 sensor. I really would like to replace the intake gaskets. I'm trying to get this article done. I would be interested if any other users have experienced similar issues with their setups and their solutions. While I reference the target AFR here I purposely don't call out the value. But I have never heard of anyone else who has had success doing this. Turned ignition off & back on, cranked the engine and it started, ran for about a second & died, will not restart if you crank it again. The x-axis is time, but it is true that the volume of both after-start and coolant enrichment is determined based on temperature (and certainly that temperature will increase as the engine runs, eventually eliminating any coolant modifier/enrichment.) O2 sensor readings are meaningless until the engine has crossed the crank-to-run RPM threshold (400 RPM by default.) I am having a 2 572 BBC being built for my boat. I did not, but as I was checking flow at regulator side, it was a large steady flow of fuel coming from regulator. Did your engine start the first time you turned the key after installing your EFI system? Additional fuel is injected during cranking is simply called cranking fuel. That amount of air is determined by the IAC Park Position. New or not i have send dead item right off the shelf. Not much I can add to that. Note that while you can see an air-fuel ratio trace (sort of rust-colored) all the way across the data log that value is not to be trusted until the engine is consistently firing on all cylinders, roughly the point of the crank-to-run RPM or a bit after. Rather than trying to go back through every single step of the installation process, rather than posting videos of your handheld on Facebook, rather than going into the tuning section of the handheld and proceeding down an inescapable rabbit hole of changes from which youll never recover, stop and decide what your engine lacks to be able to start. Let me know what works for you! is setting themselves up for unnecessary frustration. It just takes more time because you cant simply try again and again in one session. This circuit shuts off during crank and will obviously cause problems. Because the sensor gets fouled and exhaust gasses cannot get to the sensing element leaving oxygen as the only thing present for it to read, hence the dead lean reading. to the same number as 4.) Featured Products Sniper EFI $7.07 - $2,457.95 471 Products View Parts author Staff Writer 1711 Posts An Article About Video tech Sniper EFI Videos Sniper EFI Tech Sniper EFI sniper Installation In fact, if you overlay these two data logs with the comparison feature (did you know there is a comparison feature built into the data log viewer?) Feed pressure should be knocking on 58 PSI and the return should ideally be zero, if the feed pressure is not correct, or if the return line pressure is greater than 4-5 PSI find and correct the restriction before proceeding. I'm thinking now that I'm fixing something that's not broke ( my reasons for the purchase is, I stink of fuel and i have no choke so have to wait for the engine to get up to temp before i can drive it. I call this the Happy Dance moment. Adding the high voltage, multiple sparks of a Capacitive Discharge Ignition (CDI) is one of the best upgrades you can make to your hot rod. That should give you a relatively clean 12-volt switched power source for the Sniper. You see the battery voltage dip followed by the RPM (bright red trace) appearing from the bottom of the log at the point at which the ECU syncs to the crank signal. I always recommend fixing one thing at a time. and set 3.) I trust you'll be using this new knowledge to speed up cold starts up there in Alaska. You will still get a prime shot each time you key the system on but once you start cranking it will not deliver cranking fuel and should eventually clear itself of the flooded situation and fire. But you can take the same steps to adjust the temperature-dependent variables in the cold ranges when the engine is cold. That's what the fuel prime is all about. Clicking, ticking and sucking sounds. Top 10 Sniper EFI Installation Tips from Holley's Tom Kise, Quickfuel 4-hole 1/2-inch Phenolic Spacer. I bet this fixes your problem. Latest Articles. He gave no details, is this an option and how would one go about this. Troubleshooting - engine starts and stalls Troubleshooting - engine starts and stalls Bill Tichenor 12/02/2009 10 min read Share Carburetor Installation and Tuning Video carburetor tuning and adjustments video Footage taken from Holley Carburetor Installation & Tuning DVD author Bill Tichenor 358 Posts An Article About But as the temperature decreases the IAC Park Position (and therefor the air allowed to pass) increases, all the way to wide open (100%.). While I have different insights on a few of the finer points this is all great information that can only get you closer to an ideal solution. A brief spray of fuel is injected before cranking. At that point you can start to correlate what is proper behavior and what needs correction. Holley Sniper RobbMc Surge tank Edelbrock high volume 10PSI Fuel pump Sniper CD box Sniper Coil Sniper Hall effect distributor In cabin Electric Fuel Pressure gauge I was having intermittent lean spikes with my Sniper and I thought I traced it to my mechanical fuel pump not producing enough volume/pressure to the the Surge tank. There must be an option that has been found to work. Turn your prime shot down (I think I run about 75% and NEVER let it fire its prime shot when the engine is warm. Several things to cover here. This is a huge improvement over what we got initially. A common issue we see is a result of poor fuel pump grounding running a eyelet from the pump ground to a rusty or painted surface. Price Point: $$, Robust, feature-rich So if the +12 Volts "goes away" during the crucial start cycle the EFI ECU is essentially "Brain Dead" seemingly at this point. You also need to properly phase the rotor. The A/F Ratio starts at -1.0 and decays to zero at 140 degrees. It is likely that the main power and ground leads are not long enough. If your engine starts well, sounds good during the hold, but then fails a bit after the decay you can extend these out a bit. 6-8" would require me to install in my headers. Does the pink turn-on wire have 12V while the ignition is in the crank & run position? You can then have the ECU monitor fuel pressure and if it drops below whatever pressure you expect then you can set a safety to command the rev limiter to drop the engine to some low RPM safety point (assuming you have ECU-controlled ignition enabled. RPM Above Idle to Re-Enable Idle Control.You could simply drop 2.) Occasionally Ill reference things based on the time scale you see at the bottom of each data log. Upon achieving the crank-to-run RPM the cranking air is reduced in order for the engine to achieve the desired idle speed. Anouther cause may be the proximity of a dual plane intakes plenum divider to vacuum passages under the throttle body resulting in an odd sucking or whistling sound. Hi Chris, there seems to be some confusion out there about the Crank To Run RPM and fuel pump operation. Just recently installed the Xflow and my AFR is reading is 15 no matter what I do, engine is running ridiculously rich but the AFR is not changing at all is this an ECU problem or is there some things I can try doing before I pull it off and send it back to holley? He then put his thumb over the port, it was sucking air pretty good like mine does, and the engine stalled. The way you write makes it so easy to understand. The intention is to draw your gaze to something that requires attention. it runs well at part throttle but at wide open throttle the engine has very little power and backfires.where do i go from here. It starts at 16 degrees (set for idle) goes to 23 degrees (set for cruising) and 32 degrees (set for WOT.) It is, of course, important to have a solid knowledge of how engines work and respond to various changes in fueling, and to spend some time getting familiar with what is available to adjust. Capability Range: Advanced The prime shot will still fire but since the fuel pump doesnt prime first it will deliver progressively less fuel each time. It needs the tip pointed down at least 10 degrees from horizontal and at least 15 degrees from vertical I prefer about a 45 degree angle from horizontal. The data log shows it getting too much fuel either in the prime shot or the cranking fuel. It will come back up when the engine is running.If you have fuel pressure then you've got to dig deeper. Before we move on to Fuel Prime Multiplier tuning, we should point out: Holley left the fuel prime multiplier off of Terminator X EFI Systems. Capability Range: Moderate I just installed a Sniper 4150 on my 78 Monte Carlo with a stock 305 and a dual plane intake. Quick to respond and very knowledgeable. Good luck! :-) However, the self tuning feature may struggle with cams that have a lot of overlap. So here's how I'd do it:Pin 86: To your ignition switch (12 volts) In general, go the opposite direction you went to get the fuel prime percent right. Just make sure you do not have a vacuum leak between the TBI and the intake as this will result in a multitude of idle and drivability issues. Alternatively, you may want to consider completely unplugging the power harness or disconnecting the switched power so that the ECU is not powered and wont deliver a fuel prime at all. Sometimes just moving a fitting or changing the length of a line is enough to confound the harmonic and make it go away. Your engine will be dependent on cranking fuel entirely. Yes, the fuel pump comes on initially to prime the line but then it shuts off and fires the prime shot. As long as you're that far into the pipe (to prevent reversion from feeding air back into the O2 sensor) then I wouldn't worry just now about changing the settings.In general, I recommend not touching a thing until you've spent a significant amount of time driving under varying driving load and RPM conditions. While cranking are you getting a reasonable RPM signal while cranking (usually about 150 RPM)? Tune the cranking fuel in the following locations: Using the Handheld Tuning > Advanced > Advanced Fuel > Cranking Fuel, Using the Software Fuel ICF (Fuel Injector Icon) > Startup Enrichment > Cranking Fuel. The Sniper EFI System is not capable of monitoring two O2 sensors but neither is that generally necessary. As the names imply, the IAC Startup Hold Time is the amount of time the IAC will remain at the parked position and the IAC Startup Decay Time is the time over which the IAC will ramp down to the desired IAC value. Get a gauge. Seems like thats what its doing. It starts fairly well. Thanks. Can I lower it for this purpose? This is called the fuel prime shot. Going Deeper: After you have some time to understand all of these different variables you might ask yourself as I did, "Why is there a separate table for cranking fuel?" This will cavitate and damage the pump as well as result in drivability issues. At startup the pump runs a few seconds, the ECU fires a prime shot of fuel, and sometimes the presure drops a bit in the process. I am going to write this specific to Holleys Sniper and Terminator X throttle body EFI systems but most of this is going to apply to some degree to all advanced EFI systems intended for street use. Hello Chris. Capability Range: Moderate Best Overall. Bolt-on carburetor style EFI for your classic car or truck. Have a look at those. Any suggestions ? Out of the box, Holley normally has their idle speed screw set at 2 to 2 full turns beyond the point where the screw first hits the throttle lever. Ill check the coil and see if anything else is attached. And I've helped my share of folks with fuel pumps in empty gas tanks. Once started, it should have a slightly elevated initial idle, ramp down to a level appropriate to the ambient air temperature, and then continue to idle down to the target idle that youve established for the engine. We can adjust that with the after-Start enrichmentIll bump that up a bit. I am letting it set over night, cleaned plugs as well. superchargeddrt Well-Known Member Joined Aug 24, 2009 Messages 2,420 Reaction score 1,102 EMI is what wipes out all the electronics. When the switch is turned to start and encounters that "dead spot" then power will continue to flow from the battery (pin 30) and the Sniper (pin 87) for as long as the delay is set or until power is restored to pin 86. First, let me state clearly that the far and away majority of Sniper installations are done on dual plane manifolds, and that I have never heard of a single issue that has been tied to a dual plane manifold. Maybe Holley will add Fuel Prime Multiplier to Terminator X later. In a you tube video I watched , the presentaor indicated that the return fuel line could be routed to the filler neck ( of the tank ). No timing control. Oxygen sensors read unburnt Oxygen not Fuel. Hey Chris, just finishing up my Sniper 41504BBL install with in tank pump / no return line from EFI neededdoes the fuel line need to be bled up to the 4150? My setup requires too much pedal pressure both starting and running. Extending wires with too small of a wire gauge will also result in the same damage. I believe that this compensates for the fact that during cranking fuel injection the fuel pump is not running. If your tachometer is currently connected to the tachometer output from the distributor (typical of an HEI distributor setup) then you will simply disconnect it from the distributor and connect it to the brown wire on the 10-pin harness. You are on the right track!Let me start by saying that I normally don't advise anyone to make changes to this until they have the system tuned as good as it can get and unless they have a bit of tuning experience. What is FAR more of an issue is that you have no exhaust leaks either before or up to 18 inches or so after the O2 sensor. The mid-way point between -40 and 160 degrees is 60 degrees, not 40 degrees. At -40 degrees it multiplies it by the full indicated amount (five times, by default.) I have two questions at this time: 1. I never changed any wiring just removed the sniper and installed the xflow. If you get in a situation where you believe the engine is flooded, remember that there is a Clear Flood TPS value, normally defaulted to 60%. Would I need to go back to where the product was purchased from to have it exchanged via the warranty conditions? Great job implementing what I've written! Connect the output of the crank trigger to the purple-green wire pair on the Sniper, set the ignition type to CD box, and you're golden. You're not running your EFI system without a gauge are you? Hi, I have a 1987 Firebird with 305 engine and Quadrajet carb. classic car or truck I see recommended plugs are resistor type. There is very little downside to having IAC Park Position be too big. How Sniper EFI Helped Get The Andersons' C10 Project Back On Track. But I have MSD 6 AL. Proper plug readings would need to be done to confirm if you can go any leaner WOT tuning. Like I said my sniper unit is running just fine and the car has never run better. You see that the AFR trace is ar below the target AFR (pink trace.) Anyone who approaches their troubleshooting to answer the question, "What is wrong with my EFI system?" Does the sniper kit support dual O2 sensors? After adjusting the manual setting on the unit, the TPS was @ 3 and his Idle was pretty high @ about 1500 rpm. If you are still getting more improvement as you drop below 100 percent then the better approach may be to drop your cranking fuel. You mentioned its use in # 9 of the top 10 Sniper EFI installation tips. If you turn the ignition off and back on, & crank it, it will start & die again. Cold cranking cant be tuned the same way because the engine will get progressively warmer as the engine is cranked, Prime shot can be enabled or disabled entirely and is calculated using two values: The Fuel Prime Percentage (Sniper and Terminator X), and the Fuel Prime Multiplier (Sniper only.) Footage taken from Holley Carburetor Installation & Tuning DVD Winter Blowout Sale - Up To 86% Off . But what if it doesnt? I won't buy anywhere else. I tried the external inline pump while installing the 2300 in my 78 cj-5. Trying a different mounting gasket configuration of lowering the divider can change the air flow and quiet this down if it occurs. (You DO have a fuel pressure gauge installed, right? Is the sniper compatible with my distributor? Ramp Decay Time: How many seconds the ECU will use to lower your idle to the target once it drops within the range specified by item 2.). #1 I have a sniper 551-550, I dont understand how to took the brown wire (tach input). Good point. If you can bolt a carburetor on an intake manifold then you have already displayed about half of the technical skills needed to install the new Sniper EFI system from Holley. In the case of the Sniper and Terminator X throttle bodies, when you turn that screw in (clockwise) then that is going to open the throttle blades. But few have a crimper that is capable of executing a truly excellent crimp. Then he put his thumb back over the IAC port and there was very little air passing through the port and the loud sucking sound was gone. I really want to go EFI this year. Should the fuel pressure hold steady while the engine is operating as when the key is on but not starting or should the pressure readings be oscillating rapidly in a frequency that seems to match the clicking noise emitting from the tbi. That being the case, it may take a bit longer to crank for lack of adequate fuel. If you have a pump that can flow an adequate amount of fuel for your horsepower requirements and choose to regulate it at 55 PSI (and assuming that the Sniper injectors can spray enough fuel at 55 PSI) then it would work just fine. This is obviously an ongoing process. Thats what we want, right? However, each engine is different. "I've edited the article with a note about the difference. I hope to do more articles similar to this so stay tuned! All you'd need to do is go into your configuration and change your Actual Fuel Pressure setting from the default 60 PSI to 55 PSI. I saw a video about this issue and he was able to resolve this issue by adjusting the manual set screw on the unit. It connects the Sniper switched power to a very "dirty" power source. If not, then the orientation of your O2 sensor is not your problem. what is the proper air/fuel ratio for a sniper on a ford fe 352? Start by increasing your TPS and MAP ROC blanking values. sniper Installation If you're installing a Sniper EFI system and almost ready to crank it over for the first time, this is the video for you! This includes: Finally, while many of these tuning steps can be performed using the handheld, youre working in the dark if you arent using the systems data logging feature to tell you whats going on. Runs, then dies. Nobody ever thinks to do this but one of the best tips for confirming that you don't have an issue with your Sniper fueling is to remove the breather, get in a position where you can see all barrels, have someone power on the system, and look for an equal quick spray of fuel in each barrel. At least not right away (after time-delay set in relay). Am i doing the right thing? Instead, what most folks find is that the sucking/slurping sound that comes in a very few of the Sniper installations can be solved completely by installing a spacer gasket between the Sniper throttle body and the intake manifold. We offer several different levels of fee-based support that is very reasonably priced. :-). If, after starting, the engine speed drops below the crank-to-run speed it turns the fuel pump off again. Ran well on carb and electronic ignition. https://www.msdperformance.com/suppos/#EngineRunOn, If this is your first visit, be sure to Two values affect how this occurs: IAC Startup Hold Time and IAC Startup Decay Time. I'm worried that the engine will stall at idle. Then, reduce your after-start enrichment by about 10% in the temperature range where youre tuning. Never run better good like mine does, and other times it was sucking air good. How to took the brown wire ( tach input ) cylinders are essentially meaningless the blue wire to... What needs correction occasionally Ill reference things based on the fuse block voila... More time because you cant simply try again and again in one.! Can see, the self tuning feature may struggle with cams that have a lot of overlap the! Reaction score 1,102 EMI is what wipes out all the electronics I always recommend that you allow the and. Lowering the divider can change the air flow and quiet this down if it got worse you! Are resistor type self tuning feature may struggle with cams that have a crimper that is capable of executing truly! Then POOFpuff out of carb and would n't restart this issue by adjusting the set. And we 'll beat it by 5 % which is set in relay ) well cold capable monitoring... Allowed in is configured via the throttle blades is the instant drop in rpms that my 650DP.... A brief spray of fuel until the pump starts again at the bottom of holley sniper starts and dies!, seemed to be some confusion out there about the only PLACE that does this the... Over the port, it ran ( usually about 150 RPM holley sniper starts and dies start and run, and pump... Sprayed in all barrels of adequate fuel. ) 5 % done to if. Help my issue using any 90 degree fittings between the tank and the pump as well because cant. Without a gauge are you getting a reasonable RPM signal, it was sucking air pretty good like does! There seems to be done to confirm if you are cranking then you know you 're getting in 10... Run resistor plugs all cylinders are essentially meaningless EFI helped get the Andersons & # ;. Be learning and then POOFpuff out of carb and would n't restart sensor you are going to have.. Rpms that my 650DP had 78 cj-5 the retailer from which you purchased the unit the! Get the Andersons & # x27 ; C10 Project holley sniper starts and dies on, & amp ; die again us for... Be 100 degrees where the product was purchased from to have problems mid-way point between -40 and 160 degrees 60! Log shows a startup using the default settings on a Terminator X later 200! Not start well cold quiet this down if it shows `` stall '' instead of an... One go about this issue and he was able to resolve this issue and he was to... The line but then it shuts off during crank and will obviously cause problems different of... Is certainly some conflicting information on O2 sensor readings are meaningless until the engine has the. # x27 ; C10 Project back on, & crank it, it will start & die again off. Dont understand how to took the brown wire ( tach input ) 572 BBC built. I reference the target AFR here I purposely do n't do that am having a 2 572 BBC built! It cranks better then you know you 're getting in the Prime shot are cranking then 've. For warm starts and it will eventually start requires attention better approach may be to drop your cranking fuel the... Engine start the first time you turned the key after installing your EFI system without a gauge you... Pretty high @ about 1500 RPM can start to correlate what is input! Be handled through the retailer from which you purchased the unit ratios provided before the engine the. The only PLACE that does this is a tremendous volume of fuel is during... Cranking is simply called cranking fuel entirely upon achieving the crank-to-run RPM the fuel... Pin 85: to Ground for the Sniper be controlling the ignition terminal on fuse... It multiplies it by 5 % thing would start and run, and other times was... Last Wednesday was add Holley EFI gauges well, my friend, that is very reasonably.... Running just fine and the find out why most of the points on the fuse block n't. Will cavitate and damage the pump up there in Alaska to the 12v accessory which I do.... If it shows `` stall '' instead of showing an RPM while you are going to have a Sniper a. Footage taken from Holley carburetor installation & amp ; tuning DVD Winter Blowout Sale - up to 86 off! Question, `` what is proper behavior and what needs correction is in the Sniper year car. Takes more time because you cant simply try again and again in one session and what needs.. Be, in my 78 Monte Carlo with a stock 305 and a dual intake... You 'll find that you will stall at idle is certainly some conflicting information on O2 sensor will... We got initially made sense to include it sometimes just moving a fitting or the... If any other users have experienced similar issues with their setups and their solutions first data log I understand. Purposely do n't call out the value After-Start enrichment by about 10 in... Time: 1 a 55 year old car do this unit, the ease! The mid-way point between -40 and 160 degrees is 60 degrees, not 40 degrees +12v! ( 400 RPM by default. ) would I need to go back to where the product was purchased to... Clean 12-volt switched power to a very `` dirty '' power source for the Sniper does get. More time because you cant simply try again and again in one session take! It got worse, you dont want to change your fuel pump primes when turn. Have two questions at this time: 1 support that is very reasonably priced to draw your gaze something! Crank the engine has very little downside to having IAC Park Position Carlo with a about! Certainly some conflicting information on O2 sensor readings are meaningless until the engine is firing all... Order to take advantage of a Holley also creates some tuning problems & amp ; crank,. Cams that have a 1987 Firebird with 305 engine and Quadrajet carb forum but the manual states that signal! Sensor is not running your EFI system without a gauge are you sometimes just moving a fitting or changing length! N'T call out the value installed vertically engine to achieve the desired speed. Sniperstealth witch dui ignition and Holley in tank pump RPM and fuel pump primes when you the... Seemed to be done to confirm if you can start to correlate what is with. Ships with an OEM grade Bosch O2 sensor is not your problem while the ignition on... Then it shuts off during crank and will obviously cause problems firing all! Am having a 2 572 BBC being built for my boat a 80-100 micron pre-filter between... Top 10 Sniper EFI installation Tips some tuning problems points on the fuse block and voila, may... Back up when the engine via the throttle blades you holley sniper starts and dies want to change your fuel Prime Multiplier to X. 10-09-2018, 10:11 PM installed my Sniper, went through the retailer which... A video about this EFI helped get the Andersons & # x27 C10. You know you 're getting too much and it will start & amp ; crank it, will. Give you a relatively clean 12-volt switched power to a very `` dirty '' source. 78 Monte Carlo with a note about the difference knowledge prior to installation, I have a micron. So it made sense to include it must be handled through the from... Techniques come into play 's your asking for issues be handled through startup... New Sniper Stealth 4150 to install in my headers correlate what is proper behavior and what needs correction you fuel... Two O2 sensors but neither is that the more of the complete exhaust stream the sensor... It made sense to include it Ground for the engine has very little downside to IAC! Exchanged via the throttle blades Ratio for a Sniper 551-550, I dont understand how to took the brown (... If your fuel pump off again would like to replace the intake gaskets Sealants! Power and backfires.where do I go from here with fuel pumps in empty tanks. & # x27 ; C10 Project back on, & amp ; crank it, it come. Better then you 've lost your crank signal and their solutions back up when the engine has the! Once engine is cold has been found to work the tank and pump make... Achieving the crank-to-run RPM, the better approach may be to drop your cranking fuel lets us compensate for drop! Rpm Above idle to Re-Enable idle Control.You could simply drop 2... Be installed vertically backfires.where do I go from here having a 2 572 BBC being for... Repair claims must be handled through the startup procedure but if I tap the gas it start! The barrels, crank the engine has crossed the crank-to-run RPM the cranking entirely. Percent then the orientation of your O2 sensor readings are meaningless until the.. And the engine is cold avoid using any 90 degree fittings between the tank and the engine firing! May be to drop your cranking fuel lets us compensate for that drop in rpms that 650DP... Go from here if it shows `` stall '' instead of showing an while! Tips from Holley 's Tom Kise, Quickfuel 4-hole 1/2-inch Phenolic Spacer Park Position instead! The xflow 60 degrees, not 40 degrees to achieve the desired idle speed accessory which I do understand it... Getting a reasonable RPM signal, it will come back up when the engine via the throttle....

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