Your issues are likely related to one of these two things. In the setup, I set the hot idle for 850. Thanks again. But he kept having problems so eventually he did a complete check and then he found the problem. Has a good size camshaft cant find any vacuum leaks. Fuel Flow lb / h = 12.1 I' m going to put the 3rd new pump this coming friday. first attempt but as it tries to idle down to the target RPMsit can never even Or alternator? Idle quality is great, RPM is good, sometimes IAC is now between 2 and 5 exactly where it should be. It's hard to know what the previous owner did right versus wrong. If it creates an issue (not normally the case) then you'll know. holley efi. WIthout knowing quite a bit more it will be more than challenging for you to identify the problem and solve it.Fortunately, Holley provides their amazing Sniper Software. So you installed your Holley Sniper. I presume your idle speed table doesn't increase at 200 degrees? You can adjust this number up or down but there is really no need to change it unless the car is stalling.The sucking sound is just what happens when the Sniper EFI System is paired with certain intake manifolds. I'm so glad you found this helpful--that makes my day!Don't get too concerned about the specific learn percentage. Holly offers a very nice Analog-Style Fuel Pressure Gauge that is another option. 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. See these. Hi. That will at least tell you something. These are "transitional" cells, and you really have to make the effort to learn in these areas of the map. So glad this was helpful. I'll bet you find that you can get it working great without any manual tuning. Copyright 2017 Cyberspace Automotive Performance, Inc. All Rights Reserved. I did read some comments on regulator issues is there a way to check it for an issue ? Your suggestion to remove the PCV valve is just for diagnosis purposes, right? Price Point: $$, Robust, feature-rich multi-port EFI systems offer easy plug-and-play late-model V8 engine swaps. This question is really outside both the scope of what we try to discuss in the comments section as well as the overall subject of this article. If not then you have some other issue that is behind this increased idle. 3 different fuel pumps. That changes almost instantly as the engine revs.Since the learning algorithm requires some time exposure to a certain condition to make larger changes, that half-second makes only the smallest impact. It meets the target idle perfectly in either but if I lightly stab the throttle it tries to stall after slightly revving. I would disregard any correlation between idle control between the Stock and Street/Strip setups. It turns out that some of the Snipers are shipping with the minus 40-degree setting drastically lower, as shown in the following image. Ok, so I'm stumped! To do this, open up the Initial Startup gauge screen that was used in section 17.0. you have it set. The engine makes very low vacuum at idle. I put sniper on in hopes to be able to just turn key and start without fumbling with pedal to keep it going and to correct idle drop when ac kicks on. Does that make sense to you? You can manually set it 57 after you run the Wizard if required. I keep doing that with the same result. It only comes back to normal if I turn the engine off and on again. Holley will take a look and tell you you have RFI and wish you good luck in finding it. The Sniper ECU can use the timing to help maintain the idle speed and that will definitely be useful in that transition from Park/Neutral to Drive.If you don't have ECU-controlled timing, or if you do and it's not fully compensating, it may be necessary to increase your target idle slightly. The Sniper EFI Manal says not to but many EFI installers have informed me that the transmission only reads the 5V TPS signal from the Sniper EFI & does not draw any power so will not affect the Sniper EFI TPS output. Try it! Watch videos on installation hints and if you haven't yet, download & read every Sniper installation guide you can find online. Start engine let it warm up to 160, learn mode is learning. I ask because I'm using a PCV valve with my Sniper and have random idle issues as well. A couple of possibilities that come to mind in order of likelihood: Im having an issue with what I think is the Iac. Could be a bad IAC motor, replace it and see if that solves the problem. I'd recommend you contact Holley Tech support to get their input (1-866-464-6553; call early for the shortest wait times.) I've read that a spacer with 4 individual holes will solve this, but after I installed the progressive linkage the noise went away!! I'm running a 408 sbc. Your second problem should be a bit more concerning. My Sniper is 99% great! School's out for spring break this week though so I'm covering for employees on vacation. As I would slow down for a stop sign or stop light, the car would run really rough and the idle did not want to come down. Tuning > Advanced > Adv Idle > IAC Startup Of the two options, I generally recommend the self-learn. You'll have to go back and forth a couple of times to get it just right. I'm wonder if the iac can cause this. I have now determined with the TPS the noise correlates with the opening of the secondary butterflies. I recently had IAC issues identical to what you describe. I installed the Holley Sniper in my Chevelle this winter with a brand new BluePrint 496. Ensure there isn't a vacuum leak causing the IAC Position to drop to 0%. What I can't explain is why your TPS is acting so randomly. You can find those settings here: Handheld: Tuning > Advanced > Advanced Idle > Rampdown, Software: Idle > IAC Settings > IAC Ramp Down. Shut it off and immediately restarted and idle was now 880 with IAC at 8.If this is a vacuum leak I can't figure out what would cause it to go away immediately after shutting down the car and restarting. To keep it running in gear, I have to bump the neutral idle up just over 1000 RPM. Then you can take a close look at the IAC and see if it is opening. Yes, it will talk to you--but not with words. 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. And all too often we don't take that extra step of using a piston stop to ensure that the timing pointer is on zero when the engine is truly and exactly at top dead center. engine works beautiful, the car runs a lot, but suddenly, the engine does that. I've abbreviated it just a little bit but am appreciative of the added insight your comments provided.Off-idle performance can really be a challenge to self-learn but be assured that it can almost always be done. The noise changes sound with the throttle position. It won't take much! Wish I had bought my sniper from you, but unfortunately didnt. Fuel Prime Multiplier is primarily a benefit to throttle-body based EFI systems. Tried that and it didn't work? I think I figured some of my problems outI'll try to explain. Idle : IAC Rampdown : IAC hold positionChange this by maybe 2% in either direction. This will let you know at a glance if something is going awry with the fuel pump. This page was generated at 12:25 AM. that my Air/Fuel ration was 15:1 and I believe the target is 13.5:1. Idle quality is great, RPM is good, sometimes IAC is jumping around from 35 to 60. Get a solid feeling for where it is when the engine is warm and the idle speed is correct. Initial Baseline Idle Speed Screw Setting, http://forums.holley.com/showthread.neral-IAC-Info, http://documents.holley.com/199r11031r.pdf, https://forums.holley.com/showthread-Idle-Solution, If this is your first visit, be sure to Repeat until that stumble goes away, and then try a bit more throttle. You're going to have to get this fixed or it's going to cause even more problems than the high idle. Until the engine starts, the throttle only has one purpose: To detect you pressing it to 60%, at which point it shuts off the fuel injectors. Ilike a few othersam having idle issues. That's what you're seeing. I have driven a stand-alone transmission controller for the 4L60E in my (then) Sniper-equipped '95 GMC pickup using the Sniper TPS with complete success. is the fuel pressure. If I read it correctly, the solution from the other thread seemed to fix a constant 300 or so RPM increase. Thanks, That is an strange situation. The Sniper Quick-Start Manual provides the following instructions for setting the idle. technical rep said "You ahve high fuel pressure". On EFI systems such as Holley's Sniper, all of the EFI sensors (except for the O2 and coolant temperature sender) are mounted snuggly in the throttle body. The very first thing I would do is get ground truth on your timing. is jumping all over the place when you experience this condition, it does not Once engine is warmed up been driving for awhile. At some point you come upon problems that evade the easy answers and this is a good example. The idle will not return to the set value.The second issue is the same as the first but the motor will stall out. It's pretty hard to get the header tubes glowing at idle with a lean AFR. Now it registers zero and I have good idle but it will not register until it hits 60 and up. Yes its at 95lbs, needless to say he promised a new regulator would be in the Across the board, all of our customers say how impressed they were that it started and ran right out of the box just by following the simple installation instructions. Is that normal? Did you find this enlightening? The IAC reads 36 when at idle fully warmed up. This is a mighty big subject for a blog post reply, I should probably start doing some videos on this. You can disable the idle spark control at the locations below. Holley Sniper IAC Problem 04-26-2018, 11:30 AM Hello. Seems to be working. First, recognize that the amount below your target where you set the hard idle will be different on different engines. I followed the instructions and set the IAC to 2-9% when warm with idle at 850 RPM. 30 minutes later CTS reads 161, start engine Idle is jumping from 450 (almost stall) to 1500, IAC is jumping all over 10 90. Initial thought is timing but Im running a cd box and the ecu is not controlling and I did not physically change it during the install. Will restart but only for a minute or so a couple of times then shuts down fuel delivery and will not restart. Once we recognize that, the next step is to narrow down all possible sources of additional air until we discover the cause.Start by keeping an eye on your IAC number. Adding a wrap to the return spring on the shaft is one alternative to solving this. Holley Sniper Iac Delete First--besides the fact that it's not represented on the display, it is not even a parameter that you can datalog. Thank you in advance for your help and providing us rookies with your Don't know if I should put this in a separate post. Do please let us know what you find out! No timing control, coil negative ignition type. This is actually more troubling than the sound you originally described. Since your target is probably more like 700, and since 2400 is way over 1700 RPM, it's going to leave the IAC in the park position.Buckle down and find how air is getting into your engine. Member List; Calendar; Forum; Holley EFI; Sniper EFI; If this is your first visit, be sure to check out the FAQ by clicking the link above. If you don't have a working coolant temperature sensor then it will never bring the idle speed down. Since it is unlikely that anything else changed it is most likely the IAC is problematic or the butterflies are not shut all the way. It might be necessary to insulate or re-route your fuel lines if this can't be solved any other way. Nothing against Holley's method but I need to keep things simple and I do that by eliminating the effect of the IAC entirely while getting the idle speed adjusted. You should get a light spray evenly distributed in all four barrels. idle counts from 0. Without it you are working in the dark. me know how it works for you. If you haven't installed a 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! Given the circumstances I would say that it is either the IAC motor itself or RFI but you seem to have ruled both of those out. Covered the IAC port and set idle for 850 ish. When I first told him to check for leaks he looked back there and said "all good". Save Share. When I cover it with my hands, it gets quieter. By the way your site and your accessory products are nice. But once you come off the throttle there is a minimum RPM that the ECU wants to see before it releases the IAC from the park position and that is normally 1000 RPM over the target idle. Duration @.050 is 240 intake 246 exhaust with .574/.578 lift. (I'm running from a fuel cell on the garage floor 10 feet away with lines in plain sight and do see fuel coming from the return at a decent flow. Copyright 2022 Holley Performance Products, Inc. All right reserved. I set the AFR at 13.5 and all is good now. Ensure that the secondary linkage is completely closed (both visually and manually.). Two months fighting, cursing, not getting any help from Holley OR the forum, and a stupid little tin plate. Or, at least, it should. I am new to the EFI scene but want to learn. when things aren't working and this provides just that. It may take a few tries. It will learn the fueling eventually either way, it's just that one might get you there a little faster.If the idle is fine at start-up but then increases after you depress the throttle then you might need to lower your IAC Hold Position a bit. If you have any questions about the car/setup let me know. i would have been happy to answer there. 2. Hi Chris I didn't get any traction on Holley.com Fortunately, Holley has another product that can solve that: Hydramat.. Hydramat is not inexpensive but you won't believe what it can do. Yes, it will talk to you--but not with words. Hello Chris. If you patiently adjust this over the course of days you will get it just right.Again, glad this is working for you and look forward to a good report in the future! Fortunately, I have an article that goes into this in some detail. You'll be amazed at how much of this just "goes away" when you drive it enough. Don't make any changes more than about 10% and keep the same basic shape as the original (High/flat below 20 degrees, sloped downward up to 180 degress, and then flat again above that.) These problems will go away when you do that. :-). Doesn't want to start, runs like crap. And increasing your idle via the idle screw was also a good idea, because that will lower your amount of IAC that is necessary to keep your engine at the target idle speed. We'll also be contacting you for future purchases now that I've discovered you! Yes, the sound coming out of your Sniper throttle body is a pulsation from the fuel pump that is pulsing the mechanical fuel pressure regulator. But before you adjust the ECU to lean the idle out, first confirm that your fuel pressure is right. New install, when in setup wizard TPS says 90 percent and I checked the linkage and butterflies. This car has never idled under 900 without stalling with 3 carbs and does the same thing with sniper edit. But if I take off from a stop and go to 1/4 or 1/2 throttle its fine and takes off like a banshee. I have checked the pink wire and it is at .001 volts when key is off. Thanks for the great question! I have a Holley Sniper for almost 11 month now and it was running fine with no problems until now. The first thing I'd do is check your fuel pressure with a gauge like this. Pricing was reasonable, shipping was prompt and Chris helped me with a wiring question during my install. A good example of why it's so important to run a good pre filter in the fuel line. My dad wanted to recheck the timing so I set the Static Timing at 15 and it runs perfect. I got it home, checked it all over, everything is hooked up correctly. It's the same one that Holley puts in their Sniper Master Kits and I've never heard anyone with anything but good things to say about it. But there are several degrees of play there in which it should still work fine. The resulting resistance can burn up fuel pumps, wiring and relays. The answer will divide the possible sources of additional air into two, greatly simplifying the problem.If the IAC number has not increased, then review the article above regarding high idle from a vacuum leak or high idle from sticking linkage. Well, it turns out that with the current firmware this throws the IAC control into a bit of confusion. Find a lower price anywhere and we'll beat it by 5%! Do I need to try taping up the IAC port and setting the idle off the idle screw? Thanks for sharing that, Jason--great info! He has walked me through every question Iv. Note: The IAC breather hole is the roughly 1/4-inch triangular hole that sits above and between the secondaries. The progressive link can be a great solution on standard (non-Stealth) throttle bodies but I would install this LAST after everything else is working perfectly. Having a TPS that won't go lower than 9% will affect the acceleration enrichment correction, and could create a stumble at the first moment of throttle opening.Yes, the IAC can and will fluctuate depending on changing conditions. I would start by datalogging the situation and seeing exactly what your learn table looks like in the area immediately around the tip-in. I guess we can't have everything. Eventually the IAC will drop back to zero, I'll readjust it to 850 RPM & 2-9%, and then watch it steadily climb again. Do you have a PCV on the engine? I have a feeling it's something simple but I thought I'd ask you first before I inadvertently change something that affects other areas. When the idle speed screw is turned all the way out there should be just enough room between the bore and the blade to catch your fingernail. Sometimes it sounds like it wants to crank at the start but runs out of gas.
Where Is Urban Decay Manufactured,
Hyundai Mpg Reimbursement Program Login,
Articles H