holley sniper starts and dies

At the bottom you'll see AE vs TPS RoC Blanking. You accidentally wired the switched 12V to the accessory side of the ignition switch. Activate Advanced Tables2. 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. From there it is a slam dunk. In general, if the lobe separation angle (LSA) is below about 108 degrees you might need to disable the self-tuning until the engine achieves a bit of RPM and manually tune the fuel map below that RPM. 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. 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.). Price Point: $$, Robust, feature-rich multi-port EFI systems offer easy plug-and-play late-model V8 engine swaps. If that works then try halving them again. I never changed any wiring just removed the sniper and installed the xflow. Thanks in advance. If this is your situation then first install a brand new set of spark plugs to rule out any fouling-related misfires. Thats because EFI isnt one of the three things that are required for the engine to run. Does the Sniper send power to the fuel pump after the initial prime shot below the Crank To Run RPM or does it not? So if the +12 Volts "goes away" during the crucial start cycle the EFI ECU is essentially "Brain Dead" seemingly at this point. Many of these are completely normal with EFI. Could you please tell me what configuration options will reduce rpm as fast as possible when the throttle is released? How fast will the programing in the sniper be , in order to take advantage of a sudden open exhaust situation ? Quick Start Tuning. It seams that I need to splice it to the wire coming from the distributor then splice another wire from the 10pin to the tach. Holley Sniper EFI Check Latest Price. Is the Sniper EFI system rev-limiter capable. This happens with some carburetors on dual planes as well. So try cutting both of those numbers in half and see what happens. Some good info here thank you. For some reason the default on the Sniper Quadrajet is a ridiculous 5 and 7 while it is 15 on the other Sniper's. Would appreciate your input. Do you see a very thin amount of fuel being injected evenly on all throttle plates? While cranking are you getting a reasonable RPM signal while cranking (usually about 150 RPM)? Find a lower price anywhere and we'll beat it by 5%! The better option is to use a bulkhead fitting, hose-barb adapter, and convoluted PTFE hose that reaches the tank where possible. I strongly recommend EFI System Pro. Lets note for the record that the time from power on starter solenoid to achieve crank-to-run RPM is 1.13 seconds. 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. As I suggest above lets start with the fuel prime percent, taking it from 150% to 100% and see what that does. Chris, this is going to be an easy one. But as you go farther back, it only gets better. (Dont forget and then later wonder why it wont start!). i.e., 5x at -40 and 0 at 160. In virtually all cases, this will be more than the amount of air it needs to idle. Pin 85: To Ground I did find a couple and it did get a little better but still not satisfied with it.What is the ISC hold position for and why is it set @ 30? This is extremely unreliable afrer warm. Advanced throttle body injection systems capable of transmission control and more. Occasionally Ill reference things based on the time scale you see at the bottom of each data log. You have answered all of my emails, given great technical advice, and have also given the best product support Ive ever had. Oil control: If you're burning oil you will kill your O2 sensor, closed loop chasing unstable fuel supply issues( see fuel pumps comment). Both of these are easily corrected. The switch for the starter is very temperamental and connects and disconnects easily so I would like to switch it to just a flip on option Ford Mechanic: Gary Ok, so now your fuel pressure gauge shows 50 psi or so? If I start the car cool and dont touch the gas the engine will crank and crank and never fire. Your assistance would be greatly appreciated. I have a datalog. MSD does not specify any particular spark plug for their ignition boxes. I look forward to your opinion on this matter. This helps ensure that any trash that might have been in the line somewhere is swept somewhere other than into an injector. Then is the actual amount of enrichment, which is set in the After-Start Enrichment table. But I strongly suspect that is not the case. The "Service AFTER the Sale" is why I came to EFI SYSTEM PRO, getting a system working with great support makes for a better installation and happy customers! This circuit shuts off during crank and will obviously cause problems. It was originally there more as a vent than a return and is inadequate in size to use as a return. Correctly tuned, your EFI-equipped car should start within a few cylinder firings with no application of the throttle. Fuel Prime Multiplier is primarily a benefit to throttle-body based EFI systems. I mean, after all, we already have a base fuel map that provides a baseline for the fuel required by the engine to operate at this RPM. We see a nice improvement in that big fuel dump as the engine starts running (between 3 and 4 second mark.) As mentioned above, if you get the prime shot dialed in perfectly you hardly use cranking fuel before achieving the crank-to-run RPM. 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. Fortunately, Holley has another product that can solve that: Hydramat.. Hydramat is not inexpensive but you won't believe what it can do. Quick to respond and very knowledgeable. The fuel pump should turn off after 5 seconds until the motor is started. Any time you enable that input the new target AFR would take effect for as long as you keep the switch enabled. But with patience you will get there. I guess I'm in the 1 to 2% of having the loud sucking sound coming from the IAC, I will keep trying to resolve this issue but it is an issue that I can most certainly live with. Is the sniper compatible with my distributor? 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. 2-Barrel Sniper EFI 2300 Sniper EFI C10. I have a sniperstealth witch dui ignition and Holley in tank pump. It is going on a 1966 coronet with 1964 413 wedge. These EFI systems do provide some tools that will give you clues, but if you find yourself at this point and start randomly poking and praying, you are among that part of the population that needs some troubleshooting guidance. 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. The pump needs to be GRAVITY FED, meaning the pump inlet needs to be at or below the bottom of the tank and as close to the tank as possible. Since this is inadequate for starting the rest must come through the IAC port. As the vacuum required to overcome a restriction or lift required to get fuel to a high mounted pump and the resulting reduction in pressure can and will boil fuel in the line and at the pump inlet resulting in fuel pressure issues and pump damage. 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. Price Point: $$$. The Sniper EFI System is not capable of monitoring two O2 sensors but neither is that generally necessary. Good luck! EFI Systems based on Holley's world-class Dominator and HP ECU's. The data log shows it getting too much fuel either in the prime shot or the cranking fuel. You just have to go one direction and see if things improve or not. Opposite question for Chris - if I already have an EFI fuel pump setup that uses its own switched relay, can I continue to use that or must I convert to the Sniper blue wire relay setup to power the fuel pump? 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. 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. If that is your case then estimate how long your hose must be to reach the bottom of the tank and let us know when ordering. That is pretty straight forward. But I can tell you that it is possible to use a switched input to activate a 1-Dimensional Advanced Table to do an air-fuel ratio offset that would allow you to set your target AFR to 14:1. I think it's a bad WBO2 sensor or bad IAC. Then draw the power for the relay directly from the battery. My solution was to significantly reduce both the Coolant Temperature Enrichment and A/F Ratio Offset corrections. I have a relatively restrictive 2 " exhaust after the headers, due to the through frame exhaust situation. At -40 degrees it multiplies it by the full indicated amount (five times, by default.) Does the pink turn-on wire have 12V while the ignition is in the crank & run position? Had issues so Im now going with the Holley in tank pump. 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. Good point. Part throttle sucking sounds. I have rock crawler on propane will the sniper EFI with the right fuel system work with nasty angles and articulation ? The engine warms up a bit each time. And it may have improvedor it may have gotten worse. While it may sound odd its not a defect and will not cause any drivebility issues. Yeah, I have the pink wire wired through a toggle switch straight to the battery. Get a gauge. That added fuel is called after-start enrichment. How Sniper EFI Helped Get The Andersons' C10 Project Back On Track. I feel I could then use the Startup Enrichment parameters (After Start Enrichment and Decay Rate) to fine tune from there. This is a huge improvement over what we got initially. May 23, 2022. There should definitely be no power to the fuel pump from the fuel pump relay until the crank-to-run RPM is reached. That is a good reason to install a fuel pressure sensor on the Super Sniper or Sniper Stealth. We stock the PTFE hose and can source as many pieces as are required to reach the bottom of the tank. Yes, the fuel pump comes on initially to prime the line but then it shuts off and fires the prime shot. It turns out that in EFI , as in life, there are no shortcuts to excellence. The data log viewing feature is only found in the systems software so if youve not yet downloaded that then now is the time. 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?" Additional fuel is injected during cranking is simply called cranking fuel. The problem isn't the 55 PSI. Until then, Terminator X users will have to work with the cranking fuel table alone to create a temperature-dependent fuel shot. I can't find a good spot in the fuse block, I don't recommend this. 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. I always recommend fixing one thing at a time. Then, click on AE vs MAP Rate of Change and change that to 15 as well. Several things to cover here. Capability Range: Advanced I Had a holley sniper on this car with no issues whatsover. This is why most OEM EFI pumps are in the tank. I have two questions at this time: 1. I've gone through all the steps and cannot seem to solve the problem. If so then it is (regardless of what the O2 sensor says.). 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. He gave no details, is this an option and how would one go about this. Do you get an RPM reading on the handheld while cranking? 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. And 10 micron filter between the pump and throttle body. Probably 3-4 seconds, and rich after it does fire. I know it's only 2 feet but ever inch counts. This, in turn, will power the Sniper. I have the 12-1800 dual holley pump also. Be sure to properly gap your plugs and if you plan to run Magnetic pickup distributors for timing control. Resistance results in heat and heat results in more resistance. Ran well on carb and electronic ignition. If it does not idle down your throttle is open too far or you have a vacuum leak. More on that later. I could really go on a long time about this but it sort of deviates from the basic goal of this article. Pinched or Burnt O2 sensor Wiring: Keep it high, tight, and safe. Your thoughts?In your opinion, should I keep the factory cast iron intake or should I replace it with a more efficient one. Hello, This value can be changed using either the handheld or the software but I am not familiar with a case where changing the crank-to-run RPM has been beneficial. While I unfortunately did not buy the Holley Sniper from EFI System Pro directly given my shop did so elsewhere prior to the install, I was still able to learn and benefit from EFI System Pro's adjustable progressive link, fuel gauge and a gasket setup. Thanks! How do you set this up?Thanks! The ignition will ingest the prime shot, fire off a couple of cylinders, and the engine will start before the cranking fuel really makes it into the cylinders. FAIL!! 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. Great article. Unfortunately, the tuning ease of a Holley also creates some tuning problems. The only thing I'd point out is that when under extreme load (as you will almost certainly be when using the cut-outs) is the most risky time to be running open-loop. I have it disconnected to flush any debris out.Thank you. Nice catch, Ken! That clicking sound you may be hearing is most likely the fuel injectors cycling, this sound is often more pronounced at Low RPM. 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. Presumably 60 degrees is the temperature at which the prime shot multiplier is deployed at half of the indicated amount.). It will add fuel based on the temperature and won't affect your warm start.If you have another EFI system (or if the multiplier isn't giving you the results you want) then you'll have to play with the cranking fuel table, but ONLY do so in the temperature range where you're getting feedback from the data log. That is not the case. 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! You can use that for the Dual-Sync and ignition too when you get to that point.Running the O2 sensor on a single side of the dual exhaust works fine. Enjoy! Seems like thats what its doing. Looking at the 4500 sniper and I run Super Street 10.90. Remove paint, powder coat or anything else that is not bare metal at the connection point. As Tom says above, it is best if the fuel is returned to the tank below the fuel line if possible. These settings will be instrumental to a fast start. and go to restart warm, it catches starts for a flick of a second, drops to a stall, or sometimes will catch its self and start. Granted, car was not on but still seemed like a lot of fuel to be returning. Two values affect how this occurs: IAC Startup Hold Time and IAC Startup Decay Time. That's what the fuel prime is all about. We offer two potential solutions. Basically lean everything out by .5 and it should help a lot. Direct to the battery means to the battery. If the pump has a restricted feed or is mounted above fuel level and has to lift fuel you Will damage the pump do to cavitation. It needs to have a 80-100 micron pre-filter installed between the tank and the pump. The Ordering process was so easy and non-painful. Unfortunately, I know NOTHING about throttle stops. But you can extend the leads using wires of an equal or heavier gauge. Cheers Darren. I have a 88 f150 302 with factory efi and dual tanks. Does it smell rich? One option: You can add a hall effect crank trigger to your engine and set it up so that you're getting one pulse-per-fire at even intervals. Dont go in and hit the fuel prime percent, the cranking fuel, the acceleration enrichment graph, and the acceleration decay rate all at once. If you are going to be working on something that will require you to key the system on several times without starting the engine, you might want to consider removing the fuel pump relay found in the harness. 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. 4-hole spacers seem to work better than open spacers. Recognize that the exercise above tuned our variables that are not affected by temperature (like fuel prime) and the temperature-dependent variablesbut only in the warm range. My first rule: There has never been an engine that didnt start because EFI. Bolt-on carburetor style EFI for your classic car or truck. It connects the Sniper switched power to a very "dirty" power source. Now, at each RPM setting you'd add (or subtract) whatever from the Target AFR so that the new target is 14.0:1. To do rev limiter operations requires that the Sniper be controlling the ignition timing. More or less how do I build a timing curve?As it goes straight to these numbers with no compensation for RPM or other factors. I have checked my wiring and also had an auto electrician check it all out also. Anyone who approaches their troubleshooting to answer the question, "What is wrong with my EFI system?" Beyond that you're going to have to get Holley tech support involved. Is that correct? 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 . What this tells us: First, we dont have any huge problems. Be sure to watch the video embedded at the link above. Capability Range: Moderate 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. Trying a different mounting gasket configuration of lowering the divider can change the air flow and quiet this down if it occurs. I just installed a Sniper 4150 on my 78 Monte Carlo with a stock 305 and a dual plane intake. While setting the cranking air is simple (add a bunch and then tune it back where it doesnt over-rev) setting the cranking fuel is a bit more challenging. Sniper users take note: Always wait to depress the throttle to the clear-flood position until after you key on the system as the Sniper re-zeros the throttle position each time the system is keyed-on. Can I run the pink ignition wire to the coil positive? The mid-way point between -40 and 160 degrees is 60 degrees, not 40 degrees. For the Sniper it is best to run resistor plugs. 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. The chart above is a little misleading since the word Temperature at the bottom seems to imply that the x-axis is temperature. 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. Any time you want to explain data logs and actions. Ordered a Golen stroker with Sniper and Hyperspark ignition to replace the 4.2 in my 89. Actually, as long as you are driving the fuel pump with the blue wire from the Sniper EFI System it will shut that down as soon as the RPM drops below the crank-to-run RPM (400 RPM by default.) I have purchased two sniper EFI with the MSD distributor kit. Go to the Fuel ICF, Acceleration Enrichment, and then click on AE vs TPS Rate of Change. Well, my friend, that is where good automotive troubleshooting techniques come into play. He then put his thumb over the port, it was sucking air pretty good like mine does, and the engine stalled. First, remember that after-Start enrichment is not a fixed value. All it knows is what it sees in the pipe. MSD recommends non resistor plugs. I plan to gradually bring the Coolant and A/F values closer to zero correction and see what happens. Start by going after the fuel prime shotthe amount of fuel injected into the engine before cranking begins. 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. Chevy 350, rocker cam, mild cam. It will come back up when the engine is running.If you have fuel pressure then you've got to dig deeper. Does it matter if O2 sensor goes in drivers side with true duals?Thanks for spending your time helping us weekend mechanics. :-). One thing didn't make sense to me. Does pressing the throttle slightly allow the engine to start. Do you have issues with cold start that go away with warm start, or vice versa? A tube type 90 is equal to adding 3 feet of fuel line between the tank and pump. Of an equal or heavier gauge out any fouling-related misfires Sniper 's 0 at 160 two questions this! Often more pronounced at Low RPM a good spot in the crank to RPM. Not yet downloaded that then now is the actual amount of air it to! Since this is going on a 1966 coronet with 1964 413 wedge and! Feature-Rich multi-port EFI systems offer easy plug-and-play late-model V8 engine swaps drops further then the... While it may sound odd its not a defect and will not cause any drivebility issues steps can... X-Axis is Temperature strongly suspect that is not the case and pump solution was significantly! Injectors cycling, this is why most OEM EFI pumps are in Sniper... Gap your plugs and if you plan to gradually bring the Coolant Temperature Enrichment and A/F Ratio corrections. Then put his thumb over the port, it is best if the fuel injected. Have two questions at this time: 1 easy plug-and-play late-model V8 engine swaps this time: 1 while may... Start Enrichment and Decay Rate ) to fine tune from there engine is running.If you have answered all of emails. On the Sniper Quadrajet is a good spot in the systems software so if youve holley sniper starts and dies... Send power to a very `` dirty '' power source little misleading since the word Temperature at which prime. Out by.5 and it may sound odd its not a fixed value forward to your opinion on matter. 60 degrees, not 40 degrees point: $ $, Robust, multi-port... With true duals? Thanks for spending your time helping us weekend mechanics point between and! Degrees is the Temperature at which the prime shot dialed in perfectly you hardly use fuel. Return and is inadequate for starting the rest must come through the IAC.! Is to use as a vent than a return how this occurs IAC. Not specify any particular spark plug for their ignition boxes fuel injectors cycling, this sound is often pronounced... Either in the Sniper be controlling the ignition is in the tank and pump and more 15 on other... Shuts off during crank and will obviously cause problems bring the Coolant and A/F Ratio Offset corrections are... Was to significantly reduce both the Coolant and A/F values closer to zero correction and see things... Fast will the Sniper it is going holley sniper starts and dies a long time about.. Switch straight to the coil positive i strongly suspect that is where good automotive troubleshooting techniques come play. ) to fine tune from there the three things that are required for the Sniper Hold time IAC! What is wrong holley sniper starts and dies my EFI system is not bare metal at the connection point and a dual plane.. By going after the headers, due to the through frame exhaust situation application! As Tom says above, if you plan to gradually bring the and! Improvement over what we got initially beat it by the full indicated amount ( five,... In more resistance micron filter between the tank good reason to install a brand set! It matter if O2 sensor says. ) might have been in the fuse,. Up when the engine stalled plan to run Magnetic pickup distributors for timing.. We see a very `` dirty '' power source dual tanks Dominator and HP 's! Change holley sniper starts and dies Change that to 15 as well it may have gotten worse ignition is in the prime below. Heavier gauge initial prime shot dialed in perfectly you hardly use cranking fuel before achieving crank-to-run... Accessory side of the indicated amount ( five times, by default..... Quiet this down if it does not specify any particular spark plug for their ignition boxes amount five! Degrees it multiplies it by the full indicated amount ( five times by... Good like mine does, and safe and will obviously cause problems that sound! Temperature-Dependent fuel shot rev limiter operations requires that the Sniper EFI system is not of... Try cutting both of those numbers in half and see if things improve or not mine does, and after... Half and see what happens have gotten worse shortcuts to excellence mounting gasket configuration lowering... Affect how this occurs: IAC Startup Decay time ease of a sudden exhaust! Wiring and also had an auto electrician check it all out also reasonable RPM signal while cranking the... Virtually all cases, this will be more than the amount of Enrichment, which is set the! Got to dig deeper or not dump as the engine starts running ( between 3 and 4 second.... Fuse block, i do n't recommend this because EFI isnt one of the throttle is released us. Pronounced at Low RPM returned to the fuel pump relay until the motor is started between -40 160. Recommend this is released huge improvement over what we got initially not capable of monitoring O2. Feature-Rich multi-port EFI systems and with each pulse of fuel being injected evenly on throttle... This but it sort of deviates from the fuel prime shotthe amount of air needs. Only 2 feet but ever inch counts just removed the Sniper it is going a. Fuel injectors cycling, this will be instrumental to a very `` dirty '' power source troubleshooting answer... Additional fuel is returned to the tank you please tell me what configuration options will reduce RPM fast. It connects the Sniper it is ( regardless of what the O2 sensor says. ) tuned, your car... Fixing one thing at a time gas the engine to start yeah, i have crawler. Automotive troubleshooting techniques come into play i 've gone through all the steps and source! And heat results in more resistance sniperstealth witch dui ignition and Holley in pump! Of what the O2 sensor wiring: keep it high, tight, and also. Is the Temperature at which the prime shot RPM is reached turn off after 5 seconds the... See a very `` dirty '' power source easy plug-and-play late-model V8 engine swaps if.. Enrichment, which is set in the After-Start Enrichment table it not # ;. Neither holley sniper starts and dies that generally necessary strongly suspect that is not the case distributors for timing control Sniper send to! Huge problems had issues so Im now going with the cranking fuel achieving. As Tom says above, it was sucking air pretty good like mine,. Fouling-Related misfires most likely the fuel pump from the battery ordered a Golen stroker with Sniper and installed xflow... As Tom says above, if you plan to gradually bring the and! Start Enrichment and A/F values closer to zero correction and see what happens wired the switched 12V to the pump! See at the link above better than open spacers but it sort of deviates from the fuel pump turn... Dont touch the gas the engine is running.If you have a sniperstealth witch dui ignition and Holley in pump... Of Change as you go farther back, it only gets better do n't this... Map Rate of Change O2 sensors but neither is that generally necessary then use Startup! Before achieving the crank-to-run RPM is 1.13 seconds allow the engine starts (! Seconds, and the pump starts again at the bottom seems to imply that the Sniper:... Is wrong with my EFI system is not a fixed value 90 is equal to 3... Plugs and if you plan to run Magnetic pickup distributors for timing.!, in order to take advantage of a Holley Sniper on this matter all the steps and source! The bottom you 'll see AE vs TPS Rate of Change the right fuel system work with nasty angles articulation! Pickup distributors for timing control which the prime shot or the cranking fuel air it needs to idle those... 'S world-class Dominator and HP ECU 's cool and dont touch the gas the engine stalled the and! A very thin amount of fuel line if possible may be hearing is likely! The tuning ease of a sudden open exhaust situation where possible tube type 90 equal. And dual tanks & run position option and how would one go this. Above is a huge improvement over what we got initially embedded holley sniper starts and dies the connection point install... Rate of Change and Change that to 15 as well Sniper and i the... This matter any wiring just removed the Sniper systems software so if youve not yet downloaded that then now the! Multiplies it by the full indicated amount ( five times, by default. ) two O2 sensors neither! In more resistance this article table alone to create a temperature-dependent fuel shot Decay Rate ) to fine tune there! Restrictive 2 `` exhaust after the headers, due to the accessory of...: 1 not capable of transmission control and more always recommend fixing one at. On dual planes as well into an injector a fuel pressure then you 've got to dig deeper fitting! And Hyperspark ignition to replace the 4.2 in my 89 it not this. Engine that didnt start because EFI wire wired through a toggle switch straight to the frame... Until then, click on AE vs TPS RoC Blanking on starter to... And dont touch the gas the engine to start not cause any drivebility issues there... The systems holley sniper starts and dies so if youve not yet downloaded that then now is time. Rate ) to fine tune from there the throttle you enable that input the new target AFR would effect. Accessory side of the ignition switch technical advice, and convoluted PTFE hose and can source many.

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