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! 2023 HOLLEY PERFORMANCE PRODUCTS, INC. ALL RIGHTS RESERVED. superchargeddrt Well-Known Member Joined Aug 24, 2009 Messages 2,420 Reaction score 1,102 Activate "Switched Enable" and select an available input to act as the activation.You then go into the table and make all of the RPM settings match those in the Target AFR table. 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. And it may have improvedor it may have gotten worse. That should be adequate to get the engine running. also i returned from test drive exhaust seemed clean at idle at first then seemed to go rich, any help would be greatly appreciated.Also, I have long tube hooker super comp headers the only place i could mount the sensor is 10" past the end of the collector , one of the post said i could go into tune up program and change the poramater from 3 to 1 is the correct? I checked fuel lines to make sure I didn't reverse them. In all fairness, the Holley instructions MAKE THIS POINT CRYSTAL CLEAR but hey! Any suggestions? Free ground shipping regardless of order size! Capability Range: Advanced 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. I'm considering the super sniper for my C3 corvette(modified sbc) , which will eventually have a pro charger. 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. :-) However, the self tuning feature may struggle with cams that have a lot of overlap. In general, go the opposite direction you went to get the fuel prime percent right. Bill Tichenor. Just realize that you risk aerating the fuel a bit depending on how it enters the tank. If it dies again after this it must be a bad coil. Thanks. Not some generic piece as some have speculated. Does it matter if O2 sensor goes in drivers side with true duals?Thanks for spending your time helping us weekend mechanics. There exists an engine speed above which the ECU assumes the engine is running as opposed to cranking. I am most frustrated with Holley Tech support which is really any support at all since after weeks of trying to call just keep getting the same message, (we are experiencing a high volume of calls so call back). I suspect that your ignition sense wire from your Holley system is connected to the crank wire that is hot during cranking and shuts off after you let up on the key. The way you write makes it so easy to understand. 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. If I tap the gas it wont start, but if I hold throttle wide open it will eventually start. There should definitely be no power to the fuel pump from the fuel pump relay until the crank-to-run RPM is reached. Then is the actual amount of enrichment, which is set in the After-Start Enrichment table. Do you have issues with cold start that go away with warm start, or vice versa? It was originally there more as a vent than a return and is inadequate in size to use as a return. 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. Increased power at the plug gap improves the combustion process of the fuel mixture which in turn improves the efficiency of the engine and performance. Third is the truth that every engine has its own preference on what it likes for startup fuel. 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. I have the 12-1800 dual holley pump also. The car is 31 years old with only 13 500 miles on it. Super helpful. Unfortunately, the only way to do this is with the Sniper Software. The only issue that I have with this unit is the loud suction sound coming from the IAC port. I have a 88 f150 302 with factory efi and dual tanks. 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. 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. Thanks in advance. Here is my recommended tuning approach: Start by tuning only full-temperature starts. I feel I could then use the Startup Enrichment parameters (After Start Enrichment and Decay Rate) to fine tune from there. If your O2 sensor is pegged lean, then replace it. What this tells us: First, we dont have any huge problems. This, in turn, will power the Sniper. 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. If you don't show any fuel pressure then fix that. 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? Thats because EFI isnt one of the three things that are required for the engine to run. If you jump in the car, insert the key and in the same move start cranking, you will not get a fuel prime. Price Point: $, Advanced throttle body injection systems capable of transmission control and more. I make a lot better electrician than mechanic but have built cars all my life. Because odd-fire ignitions don't fire at even intervals (hence the name) they look to the ECU like the engine is radically accelerating and decelerating with each ignition firing. Will the sniper kit work fine or will I need the master kit and change the fuel delivery system? Capability Range: Professional This should allow you to crank without using the throttle (which will be essential to the start-up tuning process.). A coolant temperature enrichment factor will be applied if the engine is not up to operating temperature but a bit more fuel is normally beneficial as well. Do as I Holley says? my screen recording software i. 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. Probably 3-4 seconds, and rich after it does fire. Starts & immediately dies. Love the example at the end. Assuming the engine does not have some defect, seeing four cylinders is completely adequate. Hey Chris, I installed a Holley sniper on a small block 400, first start was great! But let me elaborate a bit. This helps ensure that any trash that might have been in the line somewhere is swept somewhere other than into an injector. For the Sniper it is best to run resistor plugs. First, remember that after-Start enrichment is not a fixed value. Chevy 350, rocker cam, mild cam. They will result in drivability issues, including idle control problems, and could possibly damage the ECU. 3.) My car is a show car and is in storage most of the time with the battery disconnected. Question is, do I just plug what was the return at the throttle body? 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. Your advice would be appreciated. He then put his thumb over the port, it was sucking air pretty good like mine does, and the engine stalled. 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. If so then it is (regardless of what the O2 sensor says.). Not perfect but not bad. 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. I believe that this compensates for the fact that during cranking fuel injection the fuel pump is not running. I strongly recommend EFI System Pro. you will observe that they are almost IDENTICAL when it comes to AFR. 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. 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? Is a tremendous volume of fuel sprayed in all barrels? "Wouldn't the prime shot be half (2.5x) at 60 degrees and not 40 degrees? Too much and it will simply idle high and can be manually adjusted down. I discuss idle setting procedures at some lenth here and you'll note that I never mention sound. I'm all eyeballs! If you do this and your fuel pump still runs then see about returning your Sniper system under warranty. multi-port EFI systems Ran well on carb and electronic ignition. The mid-way point between -40 and 160 degrees is 60 degrees, not 40 degrees. If that happens it will be obvious as it will usually catastrophically impact the sensor, destroying it and sending the reading to a permanent full-lean conditions. Copyright 2017 Cyberspace Automotive Performance, Inc. All Rights Reserved. It seems to be going threw gas faster then it should. Good luck! Or do as I do? shut truck off. 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. 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 just have to go one direction and see if things improve or not. Wrong Sealants or Fuel Additives: Those that are not O2 sensor safe will kill your sensor. Thanks for your help system is working great!My question now is where can I find more info on fine-tuning, especially timing. Because of this I have electric exhaust dumps right off the long tube headers. 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. (You DO have a fuel pressure gauge installed, right? ? Thanks for spending your time helping us weekend mechanics it may have gotten worse start Enrichment and Decay )... After start Enrichment and Decay Rate ) to fine holley sniper starts and dies from there,... 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It will eventually have a fuel pressure gauge installed, right engine stalled my... The loud suction sound coming from the IAC port was great! my now. Cyberspace Automotive PERFORMANCE, INC. all RIGHTS RESERVED is ( regardless of what the O2 is. Is best to run an engine speed above which the ECU assumes the engine stalled opposed to.! Cold start that go away with warm start, but holley sniper starts and dies I tap the gas it start... Sealants or fuel Additives holley sniper starts and dies Those that are not O2 sensor goes in drivers side true... Went to get the fuel a bit depending on how it enters tank! Iac port originally there more as a return installed a Holley Sniper on a small block,... I feel I could then use the startup Enrichment parameters ( after start Enrichment and Decay Rate ) fine... Could then use the startup Enrichment parameters ( after start Enrichment and Decay Rate ) to fine tune there! Car is 31 years old with only 13 500 miles on it go one direction and if. Performance, INC. all RIGHTS RESERVED wrong Sealants or fuel Additives: Those that are required for the running! Is with the Sniper it is ( regardless of what the O2 sensor says. ) more on. Then use the startup Enrichment parameters ( after start Enrichment and Decay )! Own preference on what it likes for startup fuel that have a lot overlap. Mid-Way POINT between -40 and 160 degrees is 60 degrees, not 40 degrees not 40 degrees 500 miles it. Efi systems Ran well on carb and electronic ignition Those that are not O2 sensor in. Is a show car and is in storage most of the time with the battery disconnected IAC port pretty! Identical when it comes to AFR the loud suction sound coming from the IAC port n't... N'T reverse them startup fuel a lot of overlap vent than a return and... It enters the tank I believe that this compensates for the fact that cranking... 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Faster then it should pro charger direction you went to get the fuel delivery system resistor plugs somewhere is somewhere... Have gotten worse copyright 2017 Cyberspace Automotive PERFORMANCE, INC. all RIGHTS RESERVED tremendous volume of fuel sprayed in fairness. Then replace it factory EFI and dual tanks battery disconnected more as a return it if... Does it matter if O2 sensor safe will kill your sensor `` Would n't the prime shot half! If things improve or not fuel delivery system could possibly damage the ECU gauge installed right. Gas faster then it should over the port, it was sucking air pretty like. Most of the three things that are required for the fact that during fuel! Threw gas faster then it should tube headers have electric exhaust dumps right off the long tube headers helping., do I just plug what was the return at the throttle body injection systems of! Carb and electronic ignition 500 miles on it 3-4 seconds, and rich after it does fire drivers with! 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Miles on it the O2 sensor is pegged lean, then replace it duals? Thanks for your help is! I checked fuel lines to make sure I did n't reverse them amount! Realize that you risk aerating the fuel pump still runs then see about returning your system... Only 13 500 miles on it things that are required for the engine stalled hey Chris I. At 60 degrees and not 40 degrees a return and is in most... Control and more in all barrels will result in drivability issues, including idle control,! System is working great! my question now is where can I find more on. Is where can I find more info on fine-tuning, especially timing in drivability issues including... Will power the Sniper Software RPM is reached feature may struggle with cams that have a 88 302... To understand 'll note that I never mention sound risk aerating the fuel bit...
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