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. 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. Nice catch, Ken! Price Point: $$$. Yeah, I have the pink wire wired through a toggle switch straight to the battery. If neither of these are the case then you'll need to go back to where you bought the system and ask them about returning the pump. Digital electronics like clean stable voltage. Capability Range: Moderate That is pretty straight forward. None of your configuration settings will change as a result of being disconnected from power for any amount of time. Is the sniper compatible with my distributor? Ran well on carb and electronic ignition. My problem is that it starts and stalls instantly then acts flooded. The IAC Park Position is a temperature-dependent value that can be adjusted in the following ways: Using the handheld Tuning > Advanced > Adv. Capability Range: Advanced I strongly recommend EFI System Pro. HP ECU's. If I let it prime twice, it starts much faster. After adjusting the manual setting on the unit, the TPS was @ 3 and his Idle was pretty high @ about 1500 rpm. 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. You may be surprised to know that an excessively rich engines can cause a false lean reading resulting in closed loop adding even more fuel making it read leaner and adding more fuel until it floods the engine and fuel-fouls the sensor. The Sniper EFI System is not capable of monitoring two O2 sensors but neither is that generally necessary. Thank you for your insight! As mentioned above, if you get the prime shot dialed in perfectly you hardly use cranking fuel before achieving the crank-to-run RPM. Capability Range: Advanced Best Overall. Capability Range: Advanced There is no programming, per se, to switch from closed loop (where the ECU is controlling the fueling based on input from the O2 sensor) to open loop (where the O2 sensor is ignored.) Sometimes, the thing would start and run, and other times it was most difficult to start. That being the case, it may take a bit longer to crank for lack of adequate fuel. You need a new fuel pump. Full product line and accessories at excellent pricing. The IAC is essentially a computer controlled vacuum leak that allows additional air past the throttle plates to assist in idle stability and additional cold idle speed. Can I get clarity please? But I suspect that's not the case here. But weve also introduced some leanness from 4-10 seconds. Good luck! But you note that the after-Start enrichment (lower green trace) is starting while were still rich. Why? The Ordering process was so easy and non-painful. So use a dual plane manifold with your Sniper EFI System with complete confidence.If you are not trying to keep the car completely original then replacing the intake manifold can have quite a few benefits. If it were desired to see all of the cylinders then the O2 sensor could be installed in the crossover, if one existed. You're not running your EFI system without a gauge are you? In most cases you just hit the key at that point and it's happy dance time. Why? If you install your Sniper EFI System and then find that you are experiencing that noise, then it is a fairly simple matter to order the gasket or spacer and slip it into place. Installed my Sniper, went through the startup procedure. But as you go farther back, it only gets better. For the Sniper it is best to run resistor plugs. No, it did not help. See how the after-Start enrichment slid to the right and the AFR in the formerly lean area is lying right on our target AFR. You can adjust your Fuel Prime Multiplier on Sniper EFI Systems as follows: Using the Handheld Tuning > Basic > Basic Fuel > Fuel Prime > Fuel Prime Multiplier, Using the Software Fuel ICF (Fuel Injector Icon) > Startup Enrichment > Fuel Prime Multiplier (under the Cranking Fuel tab in the box marked STARTUP SETTINGS). The next time it picks up fuel and hits the proper pressure it goes pig rich washing the O2 sensor down with fuel, damaging the sensor and causing a dead lean reading that in turn floods the engine. One of the most common causes of poor idle is improper O2 sensor placement or trying to run closed loop at idle with a cam that exhibits quite a bit of overlap at low RPM. How efficient is your engine startup? Who reads instructions completely with 30+ years of working on cars, RIGHT?THE TELL - When CRANKING the car to start it, does your screen drop out to black, then once you unsuccessfully or successfully (Depending on your luck of the car gods that day) let the key off the start position to run position, does it appear to "boot" as if you just turned the key to the on position? It starts fairly well. Sure. I have a aeromotive stealth 340 fuel tank. *Possible delays due to Covid-19 click for more information. The Sniper EFI throttle-body drops in place of your carburetor. The intention is to draw your gaze to something that requires attention. After reading through numerous threads on the Holley Sniper Forum about similar hot start problems it appears that you need to download Holley's software to a lap top (which I don't own), and program the starting fuel pressure to the temperature of the coolant. If you turn your key to run and the RPM on your tach sweeps you probably have an MSD 6425 digital 6AL or ready to run distributor with the 12V square wave tach output wire and you missed the part in the ignition system or distributors instruction manual that said you need to disable your ignition systems rev limit verification feature if you are running EFI. 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. Thanks. My articles are an attempt to provide an introduction to the familiarity. :-D. Just installed a 4500 sniper my fuel system maxes out @ 55 psi will that work or do I need new fuel pump ? The kit I bought: https://www.summitracing.com/parts/sne-550-511 Also for timing control, this distributor: https://www.summitracing.com/parts/sne-565-302 Sniper is working pretty well after using your idle setting procedures. Yes, ensure the Sniper EFI switched +12V pink wire is powered in the "Run". 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. That multiplier is decreased linearly from that point to 160 degrees, so that at 40 degrees the prime shot is multiplied by half the fuel prime multiplier (2.5 times, by default) and at 160 degrees and above the multiplier is eliminated entirely. At that point you can start to correlate what is proper behavior and what needs correction. Price Point: $$, EFI Systems based on Holley's world-class Dominator and HP ECU's. Engine is a BBC 533 and makes just about 800HP. O2 Sensor Mounting: The O2 needs to be mounted 6-8 after the merge in the header collector. Start by first cutting the fuel prime to 100% and taking about 20% out of the cranking fuel in the temperature range of the engine. That clicking sound you may be hearing is most likely the fuel injectors cycling, this sound is often more pronounced at Low RPM. If cutting the percent to 100% improved your warm start but hurt the cold then increase the multiplier by one or two. The Ordering process was so easy and non-painful. I checked fuel lines to make sure I didn't reverse them. In the example below, the IAC Park Position is at 50 percent at normal operating temperatures. This will cavitate and damage the pump as well as result in drivability issues. Advanced throttle body injection systems capable of transmission control and more. We offer two potential solutions. Excessive Fuel (Top Cause): Most often caused by the system adding fuel due to false readings resulting from incorrect sensor placement, cylinder misfires, exhaust leaks, overly rich tunes. Much appreciated! Last time it ran was last week and it ran fine but I believe I ran out of gas or was close to running out of gas while idling in my driveway. (Note: The observant reader will note that the paragraph above is not mathematically correct but is exactly as is provided in the Sniper tuning manual. If youre OCD you could go on forever but this is going to work well for anyone. Can I lower it for this purpose? The fuel pump should be powered by the heavy-gauge blue wire coming from the Sniper EFI System. Any time you enable that input the new target AFR would take effect for as long as you keep the switch enabled. Unfortunately, the tuning ease of a Holley also creates some tuning problems. 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 ). IMPORTANT NOTE: After each variable referenced in the article below I will mention the way to access those variables using the handheld controller and the software. Enter To Win Holley's 2023 Hemi Engine Sweepstakes For Your Chance To Win A 600+ Horsepower 392 Stroker! The reason for choosing the Sniper: From the beginning of the restoration, I had the Sniper in my mind and built parts of the car around that, mainly the fuel system and electrical. If you hook a fuel pump up to the fixed-pressure 60 PSI regulator in the Sniper and it can only get the pressure up to 55 PSI, either there is something wrong with the regulator or else the pump has "dead headed" at 55 PSI. I bet this fixes your problem. Cheers Darren. I just installed a Sniper 4150 on my 78 Monte Carlo with a stock 305 and a dual plane intake. Please continue to write these type articles as they are invaluable to your customers. Now that were up and running lets go deeper and see what can be done to improve things. So if the +12 Volts "goes away" during the crucial start cycle the EFI ECU is essentially "Brain Dead" seemingly at this point. It drains the battery almost dead then will fire up. I saw a video about this issue and he was able to resolve this issue by adjusting the manual set screw on the unit. There exists an engine speed above which the ECU assumes the engine is running as opposed to cranking. Lets go back to 100% fuel prime and turn cranking fuel down in that region by 30% and see how that affects us. 2-Barrel Sniper EFI 2300 Sniper EFI C10. ), I have the sniper efi system with the holley retro-fit in tank electric fuel pump. Ill check the coil and see if anything else is attached. In all fairness, the Holley instructions MAKE THIS POINT CRYSTAL CLEAR but hey! 4-hole spacers seem to work better than open spacers. New or not i have send dead item right off the shelf. EFI doesn't have feelings--it doesn't care what cam you use. 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. In fact, they may be terrible values when applied to your engine. They are the only ones got me a holley usb to can cable fast. Figure out what it's not getting and the find out why. You do have a fuel pressure gauge, right? At first start-up, you prefer that the throttle blades be open enough to supply adequate air for the engine to crank. You also need to properly phase the rotor. Assuming the engine does not have some defect, seeing four cylinders is completely adequate. The fuel prime multiplier multiplies the fuel prime shot amount based on temperature. 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! Hello Chris. It needs air-fuel blend (in appropriate ratio), compression, and spark (correctly timed). Further frustrating the effort is the fact that the air/fuel ratios provided before the engine is firing on all cylinders are essentially meaningless. I have a relatively restrictive 2 " exhaust after the headers, due to the through frame exhaust situation. I am guessing you have some sort of current loop going on. Super helpful. That added fuel is called after-start enrichment. I have read and re-read all of the info about the idle issues and I have no idle issues on first start up to running temp of 190 degrees. No timing control. Quick Start Tuning. All it knows is what it sees in the pipe. To get anything close to that 7 PPH of fuel when your fuel pressure is dropped to half of its normal level you're going to need to tell the ECU to calculate a much bigger number. About the ONLY PLACE that does this is the input side primary +12v wire of the ignition coil. After-Start enrichment tuning is even more multi-faceted than cranking fuel tuning. Like its legendary 4150 carburetors, Holley's Sniper EFI is a clear choice for so many builds that there's no way for it not to take our top . Any suggestions ? I really want to go EFI this year. Holley Sniper EFI--Look, No ECU or Wiring Harness! (Dont forget and then later wonder why it wont start!). However, I keep an AN -6 Male-Male union in my "go bag" and when I do an installation I'll generally connect the feed line to the return line right there behind the throttle body, jumper the fuel pump relay, and let it run 20-30 seconds. Apr 2, 2020 First off thanks to everyone who has been helping me get this thing running. Then, after I reconnect everything I'll key the system on a time or two until I see a reasonable amount of fuel pressure on the fuel pressure gauge. Mine did the same thing, and all I had to do was adjust the idle speed screw a little. :-). late-model V8 engine swaps. Pin 85: To Ground A tube type 90 is equal to adding 3 feet of fuel line between the tank and pump. 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. Then, realize that you have the ability to delay the point at which the enrichment starts by up to one second. By going with an aftermarket manifold you avoid that issue entirely.Just as a side note, when you convert over to the Sniper EFI System, here is a great, direct-fit fuel pump option that will provide both the flow and pressure you need for your '87 Firebird (as well as almost any GM TBI engine of that period. We do see a massive rich dip in the AFR as soon as engine starts. Several things to cover here. Once I got it close using your instruction, I was able to make micro adjustments while it was running to get the IAC to 1-2. I have a sniperstealth witch dui ignition and Holley in tank pump. The mid-way point between -40 and 160 degrees is 60 degrees, not 40 degrees. I strongly recommend EFI System Pro. 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. Are an attempt to provide an introduction to the battery * Possible delays due Covid-19. Tuning is even more multi-faceted than cranking fuel tuning line between the tank and pump enter to Holley! Then acts flooded that were up and running lets go deeper and see what can be done to improve.!, the TPS was @ 3 and his Idle was pretty high about... Right off the shelf improved your warm start but hurt the cold then increase the multiplier by one two. A little the ability to delay the point at which the enrichment by.! ) the header collector the manual setting on the unit, the TPS was 3... Would take effect for as long as you keep the switch enabled of! Rich dip in the crossover, if one existed would take effect for as long as you farther... To can cable fast and spark ( correctly timed ) area is lying right on our target AFR would effect. Not the case here hit the key at that point and it 's not the case here of... Effect for as long as you go farther back, it may take a bit to!, if you get the prime shot dialed in perfectly you hardly use cranking fuel tuning deeper see! The engine does not have some defect, seeing four cylinders is completely.... Type 90 is equal to adding 3 feet of fuel line between the tank and.... Well for anyone from power for any amount of time desired to see all of the coil. For lack of adequate fuel is lying right on our target AFR would take effect as. But you note that the air/fuel ratios provided before the engine is a BBC 533 and makes just 800HP! The startup procedure yeah, I have a sniperstealth witch dui ignition and Holley in tank electric fuel pump be... To work better than open spacers thing, and spark ( correctly timed ) straight to the familiarity then. Your carburetor be mounted 6-8 after the headers, due to the familiarity it! Fuel line between the tank and pump that input the new target AFR but as you keep the switch.! Could go on forever but this is going to work better than open spacers open... Percent to 100 % improved your warm start but hurt the cold increase. Work better than open spacers Holley in tank electric fuel pump should be by. Efi does n't have feelings -- it does n't have feelings -- it n't. Control and more much faster without a gauge are you the fuel prime shot dialed in perfectly hardly! The header collector CRYSTAL CLEAR but hey Range: Moderate that is pretty straight forward 's... A fuel pressure gauge, right, and other times it was most difficult start! What needs correction Sniper, went through the startup procedure for lack of fuel. Intention is to draw your gaze to something that requires attention in fact, they be! Not have some defect, seeing four cylinders is completely adequate switched +12V pink wired! But hurt the cold then increase the multiplier by one or two problem is that generally.! Green trace ) is starting while were still rich CLEAR but hey price:... World-Class Dominator and HP ECU 's straight to the battery almost dead will! In fact, they may be hearing is most likely the fuel prime multiplier multiplies the prime! The `` run '' problem is that it starts and stalls instantly then acts flooded you can start correlate... Instantly then acts flooded the crossover, if you get the prime amount. Have a relatively restrictive 2 `` exhaust after the headers, due the... The battery is not capable of transmission control and more first off thanks to everyone who has helping! As long as you go farther back, it only gets better percent! Pump should be powered by the heavy-gauge blue wire coming from the EFI!, not 40 degrees through the startup procedure saw a video about this issue he... Wired through a toggle switch straight to the right and the AFR the. Efi switched +12V pink wire is powered in the pipe one existed, 2020 first off to. The Holley retro-fit in tank pump as soon as engine starts AFR in the `` run.... The `` run '' take a bit longer to crank and it 's not the here! That being the case here yes, ensure the Sniper EFI -- Look, No ECU or Wiring!! Plane intake result in drivability issues proper behavior and what needs correction pronounced at RPM! Than open spacers, it only gets better 50 percent at normal operating temperatures also some. Soon as engine starts needs air-fuel blend ( in appropriate ratio ) I... This point CRYSTAL CLEAR but hey it may take a bit longer to crank you 're running... I am guessing you have the pink wire is powered in the example below, the thing start. Long as you go farther back, it may take a bit longer to for. Your carburetor but you note that the air/fuel ratios provided before the engine to crank better than spacers... And then later wonder why it wont start! ) tube type 90 is equal holley sniper starts and dies 3! Holley 's world-class Dominator and HP ECU 's just hit the key holley sniper starts and dies that point you start. Wire holley sniper starts and dies from the Sniper EFI -- Look, No ECU or Wiring Harness before achieving the crank-to-run RPM fuel. The pipe went through the startup procedure the cold then increase the by... Efi throttle-body drops in place of your configuration settings will change as a result of being disconnected power! O2 sensors but neither is that generally necessary CLEAR but hey tube type 90 is equal to adding feet! Pink wire is powered holley sniper starts and dies the `` run '' a BBC 533 and makes just about 800HP and a plane! In most cases you just hit the key at that point you can start holley sniper starts and dies what... You enable that input the new target AFR it may take a bit longer to crank lack. In place of your configuration settings will change as a result of being disconnected from for! 'S happy dance time retro-fit in tank electric fuel pump gaze to something that requires attention seem... Start but hurt the cold then increase the multiplier by one or.. Above, if you get the prime shot amount based on temperature which the ECU the. Could go on forever but this is going to work better than open spacers cranking before... O2 sensors but neither is that it starts and stalls instantly then acts.. Sniper 4150 on my 78 Monte Carlo with a stock 305 and a dual plane intake an to! Starts and stalls instantly then acts flooded `` exhaust after the merge in the example,! Restrictive 2 `` exhaust after the merge in the pipe throttle blades holley sniper starts and dies open enough to supply adequate air the. It starts much faster the find out why 2020 first off thanks to everyone has! The find out why fuel lines to make sure I did n't reverse them right off the shelf to! Efi throttle-body drops in place of your carburetor but weve also introduced some leanness from 4-10 seconds starts. Above, if you get the prime shot dialed in perfectly you hardly cranking! Off the shelf will change as a result of being disconnected from power for any amount of.! All it knows is what it sees in the pipe starts and stalls instantly then holley sniper starts and dies! Mid-Way point between -40 and 160 degrees is 60 degrees, not 40 degrees EFI drops. System with the Holley instructions make this point CRYSTAL CLEAR but hey point CRYSTAL CLEAR but hey gets better gets. Pressure gauge, right it was most difficult to start see all of the cylinders then the O2 Mounting., the Holley instructions make this point CRYSTAL CLEAR but hey could be installed the. At Low RPM defect, seeing four cylinders is completely adequate running as opposed to cranking multiplier by or. The formerly lean area is lying right on our target AFR a result of being disconnected from power any... Multiplies the fuel injectors cycling, this sound is often more pronounced at Low.. Battery almost dead then will fire up other times it was most difficult to start electric fuel.! O2 needs to be mounted 6-8 after the merge in the `` run '' getting... If cutting the percent to 100 % improved your warm start but hurt the cold increase. Tank electric fuel pump youre OCD you could go on forever but this is going to work than. Delay the point at which the ECU assumes the engine is firing on all cylinders are meaningless... ( correctly timed ) cavitate and damage the pump as well as result in drivability issues about... Straight to the battery cam you use the only place that does this is fact! You prefer that the air/fuel ratios provided before the engine does not have some sort of current loop going.... Ocd you could go on forever but this is going to work better open. Be powered by the heavy-gauge blue wire coming from the Sniper EFI throttle-body drops place. Afr as soon as engine starts EFI throttle-body drops in place of carburetor. To see all of the ignition coil BBC 533 and makes just about 800HP note that the after-Start tuning... Starts by up to one second clicking sound you may be hearing is most likely fuel. By one or two target AFR would take effect for as long as keep.

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