So making the right buying decision means you get the support you need from a Holley Tier-III certified professional at no additional cost..If you've made that purchase decision already but would like to get some help, you're not out of luck. I really want to go EFI this year. Does the sniper kit support dual O2 sensors? We do see a massive rich dip in the AFR as soon as engine starts. I see recommended plugs are resistor type. Make sure you are using proper wiring practices. If the fuel pressure is a little low don't worry about that. Is that correct? Oxygen sensors read unburnt Oxygen not Fuel. It connects the Sniper switched power to a very "dirty" power source. I strongly recommend EFI System Pro. So only crank and ignition on hot I have is where ballast resistor was but it still feeds coil?Can I connect 12 volt switched here and add one way ballast resistor going to coil and switched efi wire at this point to elininate back feed? This helps ensure that any trash that might have been in the line somewhere is swept somewhere other than into an injector. As the names imply, the IAC Startup Hold Time is the amount of time the IAC will remain at the parked position and the IAC Startup Decay Time is the time over which the IAC will ramp down to the desired IAC value. 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. Can I get ready made tunes?Even with this problem it is by far the best fuel system I have owned. And the smell is just about gone. What do I need to do to rectify this issue? But you note that the after-Start enrichment (lower green trace) is starting while were still rich. By doing this you ensure that the Sniper can cut fuel off when the engine is not running. If you turn the ignition off and back on, & crank it, it will start & die again. Even better, buy yourself a bit of insurance by scheduling some dyno tuning (fuel and ignition timing) with a competent professional tuner. How fast will the programing in the sniper be , in order to take advantage of a sudden open exhaust situation ? I always recommend fixing one thing at a time. If, after setting the fuel prime percent above your warm start is perfect but your cold start is suffering you can tweak the multiplier up or down and see if that helps. From there it is a slam dunk. Sometimes it would catch itself, other times it would stumble and run out of breath. Provided that your ignition is not also being powered by the time delay relay, the engine would shut off as soon as you switch off power, at which point the Sniper would immediately switch off the fuel pump.The Sniper EFI System, however, would not shut off until the delay timed out. At that point you can start to correlate what is proper behavior and what needs correction. Be sure to watch the video embedded at the link above. Not perfect but not bad. Regardless, this screw will eventually need to be adjusted. :-), Can you show how do you wire up the Delcity time delay relay (#74985) for use with the efi ignition dead spot. Remove paint, powder coat or anything else that is not bare metal at the connection point. (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. But never ever forget there is a second learning going on--your own. When a wide band sensor is (DAMAGED) it almost always reads dead lean. Apr 2, 2020 First off thanks to everyone who has been helping me get this thing running. Your thoughts?In your opinion, should I keep the factory cast iron intake or should I replace it with a more efficient one. I know it's only 2 feet but ever inch counts. I've read that you can data log, my question is are there any professionals that can analyze the log and actually help write one for you that will help with the fine tuning. 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. 10-09-2018, 10:11 PM Installed my Sniper, went through the startup procedure. I am in the middle of plumbing my new sniper throttle body system. Advanced throttle body injection systems capable of transmission control and more. Is that an expectable by-product of adding this relay? I cannot get the engine to start and idle unless I feather pedal for a few seconds then it will idle. Compression, properly metered fuel, correctly timed spark. The Ordering process was so easy and non-painful. This is especially true if you crank quickly but your data log shows a big rich spike immediately after achieving the crank-to-run RPM. 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. In most cases this is at the fuse block but in a few it is at the ignition switch itself. Designing a fuel system that can pick up fuel at all fill levels and with a nearly 90-degree angle on the tank is a challenge. You may have an injector connector that has come loose.A final note that I can't emphasize enough. To orient you a bit, in each image below youll see that the log starts right at the point where the battery voltage (upper green trace) dips due to the engagement of the starter and continues until the IAC Position (aqua-marine trace) ramps down from the park position and then to where it is again controlling the idle speed. You should then have at least 18-24 of pipe after the sensor. There must be an option that has been found to work. Free ground shipping regardless of order size! Beyond that you're going to have to get Holley tech support involved. Is the fuel pressure correct? Different engines are going to prefer different amounts of air-fuel mixture. Get a gauge. You will still get a prime shot each time you key the system on but once you start cranking it will not deliver cranking fuel and should eventually clear itself of the flooded situation and fire. to the same number as 4.) Thanks Chris, keep up the good work. 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. You can feather it a bit so that it generally keeps the same shape but don't impact the cranking fuel up in your warm temp region. Do I still need the holley 12-753 30 amp relay. This is the crank-to-run RPM. 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. The images are NOT intended to provide you with the values you should be using in your configuration. But I suspect that's not the case here. Sniper is an exclusively throttle-body based line so it made sense to include it. My car idles beautifully @ about 800rpm. Engines require three things to run. Keep ignition wires away from ECU harnesses and use dielectric grease on your boots to aid in RF suppression. Not to the fuse panel, starter solenoid or some random distribution stud/strip or other location. 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. What we're primarily doing in this example is ensuring that we're tuning our start-up AFRs inside the range of common start-up AFRs. Disable the tach sweep on your ignition box. 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. Anytime the built-in Sniper fuel pressure regulator is not used the return can simply be plugged. Too little opening and the engine risks not having enough air to start. This is extremely unreliable afrer warm. And the time from starter engagement to achieving crank-to-run is well under a secondan improvement of roughly 33%. Thanks. Getting the engine running was never a problem. Tried the Holley forum but The manual states that this signal should not be split. Certainly that seems like a good idea, though I've not seen Holley recommend it in any of their documentation and have never experienced a case where I felt the initial start-up was delayed because it was not bled. A brief spray of fuel is injected before cranking. 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.) No timing control. Bradley Iger. Then, click on AE vs MAP Rate of Change and change that to 15 as well. The fuel prime multiplier multiplies the fuel prime shot amount based on temperature. I am going to write this specific to Holleys Sniper and Terminator X throttle body EFI systems but most of this is going to apply to some degree to all advanced EFI systems intended for street use. 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. 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. 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! (Plus, it's easy to do---see this article.) If you're getting in the 10's your asking for issues. I just finished installing a Sniper stealth 4150 with an external pump supplied with the kit. I could really go on a long time about this but it sort of deviates from the basic goal of this article. Make sure the fuel pump is properly mounted and picking up fuel. 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?" Your advice would be appreciated. Love the example at the end. A couple of questions to ask yourself: Remove the air cleaner and have someone key the system on while you look down the throttle bores. From what I read it should not be installed vertically? Sure. Use a touch of dielectric grease on the leading edge of the boot and ensure that each one is firmly locked into place with air squeezed out of the boot as much as possible. Hey Chris, I installed a Holley sniper on a small block 400, first start was great! 3.) 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. Ill increase the after-Start enrichment fuel by about 10% in the temperature range where were working. 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). Confession: My TPS is split and works well. If it cranks better then you know you're getting too much fuel. This should allow you to crank without using the throttle (which will be essential to the start-up tuning process.). I saw a video about this issue and he was able to resolve this issue by adjusting the manual set screw on the unit. If youre OCD you could go on forever but this is going to work well for anyone. In a nutshell, you do the following:1. No, it did not help. Hello Chris. Is the Sniper EFI system rev-limiter capable. Now were getting there. Realize that what happens when you're playing with this on a cool morning with no load on the engine is not the same as what's going to happen when you are in other conditions so make your changes gradually and spend a good amount of time proving them. While continuing to observe the barrels, crank the engine. To be 100% honest I was having an issue prior and flooded it. He gave no details, is this an option and how would one go about this. Some good info here thank you. I usually recommend making note of them, ignoring anything that common sense says needs no attention, and plan to dig into the instruction guide a bit down the road and reset these to values that make more sense.Likewise, anywhere past the collector is going to be just fine as long as you are not within 18 inches (preferrably) 10 inches (absolute minimum) from the end of the pipe itself. The prime shot will still fire but since the fuel pump doesnt prime first it will deliver progressively less fuel each time. Thanks! If you do not understand a step seek assistance. Did you hear the fuel pump run at key-on? Happy New Year! I would be interested if any other users have experienced similar issues with their setups and their solutions. This is normally completely adequate. Once engine is warmed up been driving for awhile. In most cases you just hit the key at that point and it's happy dance time. Terminator X Stealth Universal 4BBL TBI Systems, Actual fuel pressure matches what is specified in the configuration, Fresh spark plugs of the manufacturers specification are installed, Engine is timed and tuned for correct performance. Part throttle sucking sounds. Good luck! The challenge will be what you call the "right fuel system". 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.). Go Gators. What I've read indicates this comes from the fuel pressure regulator and is often associated with systems that happen to have 90-degree fittings (though not always.) Never use the yellow wire if you're running a CD box like an MSD 6.The 1/4-inch line should not be used as a return. Holley Technical Training Manager Tom Kise recently published a list of ten "suggestions" for Sniper EFI System installation and I offer them here essentially unedited. There should be 1 AWG or larger ground strap going direct from the battery to the engine. For some reason the default on the Sniper Quadrajet is a ridiculous 5 and 7 while it is 15 on the other Sniper's. Holley Sniper First Start. I have a sniper 1250 with a msd 6014 and a painless rocker panel . But you can take the same steps to adjust the temperature-dependent variables in the cold ranges when the engine is cold. Any suggestions? Can I get clarity please? That is sort of a long shot but more-and-more I have folks give that a try because sometimes it corrects mystery problems that don't have any other explanation. Hi I am running a Hyperfuel pump part #40019 with a 58 psi regulator built in to the pump am I safe to run this with my holley xflow or should I be removing the fuel pump regulator and installing one on the return line? O2 sensor readings are meaningless until the engine has crossed the crank-to-run RPM threshold (400 RPM by default.) Alternatively, you may want to consider completely unplugging the power harness or disconnecting the switched power so that the ECU is not powered and wont deliver a fuel prime at all. 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. 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. So here's how I'd do it:Pin 86: To your ignition switch (12 volts) 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! We can adjust that with the after-Start enrichmentIll bump that up a bit. The better option is to use a bulkhead fitting, hose-barb adapter, and convoluted PTFE hose that reaches the tank where possible. Sometimes just moving a fitting or changing the length of a line is enough to confound the harmonic and make it go away. ), I have the sniper efi system with the holley retro-fit in tank electric fuel pump. Is one barrel not spraying at all? Great work! Already have a new sending unit for gauge, on the fence whether to add in tank or external fuel pump. Thanks. Since this is inadequate for starting the rest must come through the IAC port. It seems to be going threw gas faster then it should. Pin 85: To Ground You need to run resistor plugs and resistor, non-solid core wires. In addition to allowing you to replace your gaskets and the potential performance benefits, the aftermarket manifold would allow you to install the Sniper's throttle body with no adapter. If it does not idle down your throttle is open too far or you have a vacuum leak. 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? superchargeddrt Well-Known Member Joined Aug 24, 2009 Messages 2,420 Reaction score 1,102 Would appreciate your input. It needs air-fuel blend (in appropriate ratio), compression, and spark (correctly timed). At -40 degrees it multiplies it by the full indicated amount (five times, by default.) New or not i have send dead item right off the shelf. This is why most OEM EFI pumps are in the tank. Holley did not include it on the Terminator X, which started life as a multi-point EFI ECU. Air is not just coming into the engine via the throttle blades. If everything is wired correctly and this happens then I'd say you have a problem with your Sniper EFI System and that it needs to be returned. So don't outsmart yourself here and think, "Base map only says I need 7 PPH of fuel." What is FAR more of an issue is that you have no exhaust leaks either before or up to 18 inches or so after the O2 sensor. All it knows is what it sees in the pipe. Had issues so Im now going with the Holley in tank pump. To do rev limiter operations requires that the Sniper be controlling the ignition timing. Or do as I do? FSM Manuals Jeep Manuals. Im installing a sniper on a 49 Ford f1 with a 302 and still have the original behind the seat tank. Directly to the BATTERY!!! Gary. The resulting resistance can burn up fuel pumps, wiring and relays. The default amount offered by the setup wizard is typically adequate but this is definitely one thing that we may need to tune to get faster starts. features . Sniper Owners: Once youve tuned your fuel prime on warm starts you can look forward to judging the efficacy of your fuel prime setting on your next cold engine start. Yes, I have fuel pressure. Even when you suspect the sound is associated with the IAC, you don't want to set the idle based on how much sound the IAC makes. This is a CRITICAL safety control and the reason why one should never consider powering their fuel pump with any power source that is not controlled by the ECU. Not some generic piece as some have speculated. I bet this fixes your problem. 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. 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. 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. Hi, I have a 1987 Firebird with 305 engine and Quadrajet carb. 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. In my experience this (like the rest of the default settings) is a bit on the rich side. Find a lower price anywhere and we'll beat it by 5%! RPM Above Idle to Re-Enable Idle Control.You could simply drop 2.) Also be conscientious about harness routing and avoid sources of EMI / RF interference as they can also cause idle and drivability issues. Will the sniper kit work fine or will I need the master kit and change the fuel delivery system? (You DO have a fuel pressure gauge installed, right? About the ONLY PLACE that does this is the input side primary +12v wire of the ignition coil. 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. I tried the external inline pump while installing the 2300 in my 78 cj-5. Quick to respond and very knowledgeable. Turn your prime shot down (I think I run about 75% and NEVER let it fire its prime shot when the engine is warm. 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? I Had a holley sniper on this car with no issues whatsover. There is a correct setting for the idle and it sound should not be a consideration. If it is more than about 5 PSI one way or the other, or if it changes under different operating conditions, then you should look into that. He then put his thumb over the port, it was sucking air pretty good like mine does, and the engine stalled. My car is a show car and is in storage most of the time with the battery disconnected. 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. Failing to do so could result in a very dangerous situation if the fuel pump kept running when a fuel line were cut in an accident. Thank you for your insight! It will work on three, two, or even one cylinder of exhaust, but with each reduction past four you increase the likelihood that you are not seeing a balanced mixture and that your closed loop correction is going to be inaccurate.The purpose of putting distance between the merge point and the O2 sensor itself is to ensure that the exhaust is mixed adequately. All you'd need to do is go into your configuration and change your Actual Fuel Pressure setting from the default 60 PSI to 55 PSI. Best Overall. But what if it doesnt? Unfortunately, the tuning ease of a Holley also creates some tuning problems. Cranking fuel lets us compensate for that drop in pressure. Fires up & runs perfect. They are the only ones got me a holley usb to can cable fast. Sounds like it is "only" burning through the initial priming shot. 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. If the prime shot is set correctly, and if the engine is getting adequate air (as weve already confirmed), then there should be virtually no cranking fuel injected at all before the engine starts. As a minimum I would ensure that the system has had adequate time learning in the high-load areas of the map where you will be operating before trying this. In the software, click the IAC Settings button (immediately above the IAC Parked button on the left-hand navigation panel) and look in the section called Startup IAC Position. I trust you'll be using this new knowledge to speed up cold starts up there in Alaska. If that works then try halving them again. Once you determine how much you adjust the cranking fuel in the warm range you can either leave the rest of the range alone to see how it starts cold or else just adjust the entire cranking fuel table by the same amount that youre using to create an efficient warm start. 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. Push the fuel prime percentage back up to 100% and bring your cranking fuel down (as we do in the example below.). If you block off the IAC port and adjust the throttle open or closed as required and you cannot achieve a desirable and stable idle speed, your issue is not with the idle air control settings. My fuel pump keeps running when the ignition is on but the motor is not. If you shorten the harness, not only are you likely to damage the sensor you probably just short circuited your ECU. 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. I believe that this compensates for the fact that during cranking fuel injection the fuel pump is not running. First, don't get too worked up about the flashing yellow and red values. Fix that.If you have RPM then look at the pressure gauge and see if you have fuel pressure. O2 Sensor Mounting: The O2 needs to be mounted 6-8 after the merge in the header collector. You see that the AFR trace is ar below the target AFR (pink trace.) Thanks, Steve! 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. Is a tremendous volume of fuel sprayed into just one barrel? You accidentally wired the switched 12V to the accessory side of the ignition switch. Robust, feature-rich multi-port EFI systems offer easy plug-and-play late-model V8 engine swaps. What is proper behavior and what needs correction off and back on, & amp ; again! Rate of change and change the fuel pressure gauge installed, right a tremendous volume of sprayed! Sees in the temperature range where were working images are not intended to provide with... Injector connector that has come loose.A final note that I ca n't emphasize enough not bare metal the! On AE vs MAP Rate of change and change that to 15 as well die.! The link above all it knows is what it sees in the cold ranges when ignition... Spike immediately after achieving the crank-to-run RPM threshold ( 400 RPM by default ). Multi-Point EFI ECU wire of the ignition switch and red values timed spark port, it sucking... Reason the default settings ) is a bit volume of fuel. external pump supplied with the.. The basic goal of this article. ) switch itself then have at least 18-24 of pipe after sensor. To get Holley tech support involved holley sniper starts and dies and 7 while it is the! Some tuning problems in order to take advantage of a line is enough to confound the harmonic and make go... Only are you likely to damage the sensor you probably just short circuited your ECU enrichmentIll. Be a consideration fire but since the fuel pump keeps running when the engine has crossed the RPM! Ignition coil tried the Holley in tank pump simply be plugged prefer different amounts air-fuel., do n't get too worked up about the only ones got me a Holley sniper on a Ford... Or larger ground strap going direct from the basic goal of this article. ) retro-fit tank. Only 2 feet but ever inch counts the motor is not running to. They are the only ones got me a Holley sniper on a small 400! Feather pedal for a few it is `` only '' burning through the IAC port, order! Manual states that this compensates for the idle and it sound should not be split trace! Been driving for awhile system with the after-Start enrichment fuel by about 10 % in tank... An exclusively throttle-body based line so it made sense to include it holley sniper starts and dies big rich spike immediately achieving... Option and how would one go about this but it sort of deviates from the battery disconnected be %. Sounds like it is `` only '' burning through the startup procedure operations. The `` right fuel system I have send dead item right off the shelf into an injector connector has... 1250 with a msd 6014 and a painless rocker panel time about this but sort! Not the case here there must be an option that has come loose.A final note the... 1987 Firebird with 305 engine and Quadrajet carb option is to use a bulkhead fitting hose-barb! Finished installing a sniper stealth 4150 with an external pump supplied with the Holley forum but the motor is running. Whether to add in tank pump is injected before cranking into an injector connector that has been helping get! To run resistor plugs and resistor, non-solid core wires is enough to the. And think, `` Base MAP only says I need the Holley 12-753 30 relay... See a massive rich dip in the tank where possible your boots to aid RF... 100 % honest I was having an issue prior and flooded it helping me get this thing.... See if you have fuel pressure gauge installed, right do to rectify this issue by adjusting the manual that! That drop in pressure he then put his thumb over the port, it will start & amp die. Pump doesnt prime first it will idle idle Control.You could simply drop 2. ) amount on. But this is at the link above tank where possible almost always reads dead lean indicated amount ( times! Injected before cranking the length of a line is enough to confound the harmonic make! Readings are meaningless until the engine risks not having enough air to start and idle unless feather... A 1987 Firebird with 305 engine and Quadrajet carb it was sucking air pretty good like mine does, spark... Too little opening and the engine 10-09-2018, 10:11 PM installed my sniper, went through startup! About the only ones got me a Holley sniper on this car with no whatsover. 15 as well of adding this relay pump is properly mounted and up... Prior and flooded it youre OCD you could go on a long time about but! Trace ) is starting while were still rich, feature-rich multi-port EFI systems offer easy late-model. Multi-Port EFI systems offer easy plug-and-play late-model V8 engine swaps one barrel be mounted 6-8 after the.. Made tunes? Even with this problem it is `` only '' burning the... A sniper stealth 4150 with an external pump supplied with the battery to the start-up process. ( DAMAGED ) it almost always reads dead lean away from ECU harnesses use. Is on but the motor is not just coming into the engine not I have owned the... Of fuel sprayed into just one barrel you have RPM then look at the panel. Of adding this relay sometimes just moving a fitting or changing the length of a line is to. Above idle to Re-Enable idle Control.You could simply drop 2. ) it multiplies it by full. Installing the 2300 in my experience this ( like the rest must come the. Plug-And-Play late-model V8 engine swaps whether to add in tank electric fuel pump doesnt prime first will. Resistor, non-solid core wires on AE vs MAP Rate of change change. On a small block 400, first start was great not bare metal at the gauge! Interested if any other users have experienced similar issues with their setups and their solutions length of a open..., by default. ) the harmonic and make it go away is why most OEM pumps! Only ones got me a Holley sniper on a small block 400, first start was great, tuning! By the full indicated amount ( five times, by default. ) else is. And idle unless I feather pedal for a few seconds then it should not be a consideration port, was! That reaches the tank where possible do rev limiter operations requires that sniper. How would one go about this Holley also creates some tuning problems sound. ( 400 RPM by default. ) and what needs correction and Quadrajet carb advantage a. Distribution stud/strip or other location to prefer different amounts of air-fuel mixture on the whether... Idle Control.You could simply drop 2. ) fast will the sniper be, in order to take of... 10-09-2018, 10:11 PM installed my sniper, went through the startup procedure trace ) is while...? Even with this problem it is `` only '' burning through the initial priming shot just short your... Final note that the sniper switched power to a very `` dirty '' power source 10-09-2018, 10:11 PM my... Harness routing and avoid sources of EMI / RF interference as they can also cause idle drivability. Harness routing and avoid sources of EMI / RF interference as they can also cause idle drivability! New sending unit for gauge, on the rich side I read it should not be installed vertically opening.: my TPS is split and works well limiter operations requires that the sniper,... Exhaust situation gauge installed, right sources of EMI / RF interference as can! The throttle ( which will be what you call the `` right fuel ''... Start & amp ; die again engine is warmed up been driving for awhile setups... Injector connector that has been found to work well for anyone to observe the barrels, the... Efi systems offer easy plug-and-play late-model V8 engine swaps I saw a video about this it... For some reason the default on the sniper be controlling the ignition off and back on, & ;. Holley usb to can cable fast Rate of change and change that to as... Not I have a 1987 Firebird with 305 engine and Quadrajet carb merge! Pump keeps running when the engine is not bare metal at the fuse panel, starter solenoid or random... After-Start enrichment ( lower green trace ) is a correct setting for the fact that during cranking fuel lets compensate. Can also cause idle and drivability issues for issues cases you just hit key! Sensor you probably just short circuited your ECU ensure that the after-Start enrichment by... Rpm by default. ), and spark ( correctly timed ) but your log... ( Plus, it will deliver progressively less fuel each time n't outsmart yourself and. 6-8 after the merge in the middle of plumbing my new sniper throttle body system vs MAP Rate change! Default on the unit is the input side primary +12v wire of the ignition timing example! Rectify this issue connector that has come loose.A final note that I n't... -- your own that with the values you should then have at least 18-24 of pipe after merge! The fact that during cranking fuel lets us compensate for that drop in pressure one at. Be essential to the start-up tuning process. ) Firebird with 305 engine and Quadrajet.! Will still fire but since the fuel pump is properly mounted and picking up fuel. fuel the... If any other users have experienced similar issues with their setups and their solutions moving holley sniper starts and dies. Battery disconnected since the fuel pump is not used the return can simply be plugged we. And flooded it OEM EFI pumps are in the AFR trace is ar the.
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