holley sniper efi iac problems

That is not a huge problem but it just means the IAC has no ability to lower the idle beyond what it is running at that point. But I can tell you that for most people who try this it introduces so much RFI onto the Sniper that it never works right. We have shipped quite a few of these to customers in Australia and New Zealand so I know that there is becoming a good following there!We recommend this Inline 10-micron fuel filter to prevent problems like that. Hello, Chris, thanks for the help.I have not installed the software yet, and I'm having trouble with two cars. >I'm using russell hi pressure gas line to feed the gas up to the sniper and using the stock steel gas line that use to be the feed line for the carb to return the gas to the tank. Robust, feature-rich multi-port EFI systems offer easy plug-and-play late-model V8 engine swaps. It has a lightweight centrifugal spring kit installed so I reach total timing around 2500 rpm. Cycled the ignition off. Start by doing the fastest start you can that doesn't bog. I installed the Holley Sniper in my Chevelle this winter with a brand new BluePrint 496. I have installed my Sniper and the car runs great. Can the return line be an issue?I have had 2 faulty gpa-4 255 walbro pumps go bad. You just need to go back through the IAC adjustment procedure now that idle timing control is enabled. The IAC going to 30 is normal. Others might require 60 RPM. No big deal, just time to re-adjust! Though they both are indications of the amount of opening through the throttle body, the TPS is the throttle opening percentage and the IAC number tells us how far the IAC stepper motor is opening the bypass air circuit.If I understand you correctly you are saying that the TPS reads somewhat normally (traveling from 9% to 100% or so) but that when you cycle the key it once again starts at 9%. Then it started behaving oddly. It is always best to get the base map as close as possible before adding acceleration enrichment. You could go either way.. Holley - 543-105 EFI Idle Air Control Motor , Black - amazon.com NOTE: Do not attempt to set the target idle speed and IAC position until the engine is above 160F! Remember that as an EFI System Pro customer you have access to me at any time via my cell phone. The small rubber plug had a leak. 90% of problems, (INCLUDING MYSELF) could be answered/fixed by just reading the instructions. % = 49 My IAC and TPS show zero when it does this. If you look down and your TPS is 2% then either your throttle is stuck slightly open (which itself will cause the idle-up) or RFI riding on the TPS signal has caused the ECU to see the throttle as open and, as a result, open the IAC to the hold position. It is good to at least know that the Sniper fuel pressure regulator can have high pressure failure issues (contrary to what I posted to Scott back on April 13th!) I recommend you have a look:https://www.efisystempro.com/efi-pro-hangout/holley-sniper-efi-instruction/solving-sniper-rfi-problems, I recently purchased your fixed linkage to open primaries first and the throttle linkage extender to also get a smoother pedal. 90% of time with engine hot. I do know that the reference angle is 57.5, the inductive delay says 100.0. Supports up to 650hp with Four 100 Lb/Hr Injectors! The only way to do this is by installing a mechanical fuel pressure gauge. ChrisI finally got everything resolved. Look over all of your vacuum lines and fittings. Hello, I am having a tps and idle issue. Note that sometimes you can get into a back-and-forth situation. That is what I really respect about Holley. Is there away to program the ecu to compensate for this at start up. Plus, you can email that file to me and I can be of more help. If the TPS is 1% or below then the air is coming from somewhere else. Handheld shows plenty of fuel so I dought it's an issue there. Have you ever experienced a high idle once the engine reaches 200 degrees?Ive set my idle the way you said and it works great until the engine reaches 200 degrees. The engine makes very low vacuum at idle. If it is already adding fuel, it may be worth expanding this into the area where the tip-in is occuring (and where there is no learning occuring. Thanks again Chris, your help has been invaluable.If anyone is considering going EFI, Chris is the man to chat with. With an assistant pressing the accelerator, you need to make sure that when the accelerator is pressed to WOT that the throttle blades are fully opened, and when accelerator is lifted the linkage is fully at rest against the idle speed screw. Using a Snap-on variable timing light so this is why I say timing is perfect. In most cases the IAC (Idle Air Control) circuit is the source of the whistle. If you can track specific engine coolant temperatures where the engine stumbles and dies that would be a good place to start. I would gladly engage with you to solve this but ultimately you are going to need to go through whomever you purchased the system if a warranty return is in order. Thank you for any advice. I think that the more important point is that Holley kept sending him units until everything was working. When I put it in gear, it drops so low that it will stall if I don't add throttle. However, it is a good question so I thought I'd throw a few bits of info out there that I think might help.First, I believe that you may have a basic misunderstanding of what is being referred to sort of generically as AFR. )If you rule out a fuel supply issue then we're going to have to gather a few more clues. IAC Pos.% = 0 This page was generated at 12:26 AM. I would continue checking the electrical connections along the fuel supply. Thank you for your input. Two things to keep in mind as you do that. 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. If the issue persists, you may need to replace the IAC. Ive also used another snap on light to confirm. You can find those settings here: Handheld: Tuning > Advanced > Advanced Idle > Rampdown, Software: Idle > IAC Settings > IAC Ramp Down. I also tried changing roc/map to 8 from 15 again no change at all.My ve table is smooth and tuned I even changed my AFR to 13.5 from 14.2 and no change at all. We are running a Sniper on my mates 355ci small block V8 & so far he is very impressed ! But another thing to consider is adjusting your target A/F ratio. It could be that you've left a vacuum port unplugged, it could be that the throttle plates are misaligned (unlikely), it could be that your IAC is not closing properly. Part# 538-13. Holley EFI Electronic Fuel Pressure GaugeI think its a little ridiculous that I cant see fuel pressure on the display even though its measuring it but whatever. The idle will not return to the set value.The second issue is the same as the first but the motor will stall out. If that happens then follow my 10-step process shown above. I had that problem, right out of the box it would not power up, sent it back in, had defective hand held. Then it changes and will not idle down, the handheld will display 0% IAC but you can see and feel that the IAC valve is more like 100%. Based on your situation above as well as some of other experiences, I recognized that I needed to improve my tuning procedures above to better explain what steps to take if that 10-step process doesn't completely solve the problem. Sniper EFI offers superior throttle response and wide-open throttle power. When I removed the tape and started it again, it was idling at 1400-1500 RPM and sucking a bunch of air through the IAC, even though it showed 0% on the sensors screen (pic attached). Now it's at 5% on a big cam 440 Mopar. When I put it in gear, it drops so low that it will stall if I don't add throttle. (Grease can sometimes do the same thing as a more permanent gasket sealer without making the removal of the air cleaner such a pain.). As I said I didn't buy from you so you don't owe me anything. If your fuel pressure is at or about 60 PSI then visually inspect the barrels of the throttle body while having someone key on the Sniper. If it creates an issue (not normally the case) then you'll know. I think you will find that it will learn its way through this. Let It would be possible to set up a 1D or 2D table and do something like this, so if you've gotten into these advanced setups then that would be another thing to check.If neither of these work then I'd recommend that you do a data log of the engine idling as the temperature is reaching and then exceeding 200 degrees. Idle : IAC Rampdown : IAC hold positionChange this by maybe 2% in either direction. I can have it working fine (5% to 10% at target idle at operating temp.) I have an entire article on choosing between Sniper and Terminator X throttle body solutions and while Sniper is still a sound choice for some applications, Terminator X (with transmission control) is hands-down the way to go for those who need that. There is no sense proceeding until your TPS is at zero at key-on. If you have an installation or start-up issue that is nagging you then please use the comments section to reply and we will gladly provide more information that we hope will be useful to you. So try changing your IAC hold value slightly:Tuning : Advanced : Adv. So you installed your Holley Sniper. Hi Chris I didn't get any traction on Holley.com = 2.34 It is how the engineers allow you to clear a flood condition when you detect it. Hi Chris. It will need to see it again and again. i would have been happy to answer there. But when you have it then you can look for exactly what the IAC is doing at that point, and if there is anything that might lead to this happening. When you set the Static Timing to 15, what did you read with the timing light? Seems to be working. Using the handheld, navigate to Tuning > Basic > Basic Idle and ensure your target idle speed is set to the RPM you desire. Capability Range: Professional Note too that the larger the throttle stab, the more brief the time in that cell and the more gradual the change.Here's what I recommend: Get somewhere where you can repeatedly stop and go. Going lower with the blanking might pay dividends, but there is so little room below 7/8 that you will quickly be in a range where every tiny variation in the TPS or MAP is throwing extra fuel into the engine. The Sniper Quick-Start Manual provides the following instructions for setting the idle. Though it started and ran good, it was dumping fuel and would not lean out to AFR set points. Holley sniper, bogging/ losing power "NOW FIXED" Wish I had bought my sniper from you, but unfortunately didnt. Turn the idle speed screw on the primaries in about 2-3 turns after it makes contact with the linkage and starts opening the primary throttle blades. )So before I hook up another gauge to see if the Auto Meter is bad (assuming I can find a 0-100 test gauge in my shop). The link above includes the option to buy a -6 AN Have you confirmed your fuel pressure at idle is 60 PSI? Now I have most of the bugs worked out it runs fine on the highway and around town it's just the idle. OK, I did the baseline idle speed screw setting. Super helpful and knowledgeable. Contact whomever sold you your system or Holley directly. Yes, let me know how that setup process works. That initial rev is going to be determined by your IAC Park Position. IAC looks good once it finally s fires. Should I just disable idle timing control? Generally, one of two things: a stuck throttle or noise on the TPS signal. That is not the way to go. ?I never had my Carb Cold start RPM any higher then 1600 RPM.THANK YOU. carburetor setup, but it does blow when I can't jump on the highway like I use But as you see from the recent revision I did above you seem to be having a fixable issue. The only way to confirm RFI problems is by doing a data log. Yes, it will talk to you--but not with words. These will fix the noise but if the performance is suffering then likely you won't see any difference since it is not likely to be related to this sound. Due to when the pump i'm using now makes a loud howling noise when it gets ran for awhile and it gets at a 1/4 tank of fuel or less.

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