Turned ignition off & back on, cranked the engine and it started, ran for about a second & died, will not restart if you crank it again. And the less correction you do until you understand that---the better! Price Point: $$, EFI Systems based on I have checked my wiring and also had an auto electrician check it all out also. Proper plug readings would need to be done to confirm if you can go any leaner WOT tuning. 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. But what if it doesnt? 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. Capability Range: Advanced Im not looking for timing control just upgrade to EFI. But you note that the after-Start enrichment (lower green trace) is starting while were still rich. Fires up & runs perfect. I have a 88 f150 302 with factory efi and dual tanks. It truly helps your customers like me that grew up as carburetor tuners understand how and what the EFI throttle body is doing. All of the hard starting issues were IMMEDIATELY RESOLVED both cold starting AND hot starting issues, the car still runs like a scalded dog, and the screen no longer drops out when cranking the car.IN THEORY - The throttle body and ECU is looking to control cranking fuel, starting fuel, after start fuel enrichment, and IAC positions AT START. 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? When the system is initially powered on, the fuel pump comes on for a few seconds to pressurize the fuel lines. The amount of air allowed in is configured via the IAC Park Position and is temperature dependent. Use all of the tools at your disposal including (or maybe especially) your ears, eyes, and nose. Robust, feature-rich multi-port EFI systems offer easy plug-and-play late-model V8 engine swaps. Engine is a BBC 533 and makes just about 800HP. Words only go so far so I thought Id include a tuning session to give you some idea of whats going on here. I really want to go EFI this year. 2-Barrel Sniper EFI 2300 Sniper EFI C10. Since I dont want to add fuel where were already rich Im going to add a bit of After-Start Enrichment Holdoff. Thanks. Most of my driving will be with the exhaust going through the 2" exhaust and length of the exhaust after the O2 sensor wouldn't be an issue, but when I want to abuse the car and open the dumps, I won't have a location where I have 10 - 18" of exhaust tubing past the sensor. Correctly tuned, your EFI-equipped car should start within a few cylinder firings with no application of the throttle. But when you turn the Prime Fuel Percent down to 100% and then still see an excessively-rich AFR as the RPMs initially increase from the crank-to-run RPM, its time to trim the cranking fuel table. I have just finished installing my Holley Sniper to my 67 Camaro. All of these values are configurable. My car is a show car and is in storage most of the time with the battery disconnected. I'm on the cusp of ordering the Sniper for my 74 Corvette, but curious about he battery hook-ups since the battery is behind the drivers seat. Capability Range: Moderate Either way, What I recommend is running a switched power wire from that point to a relay and then using that to switch power directly from the battery to all of your sensitive electronics (Sniper, HyperSpark, etc.). This is most often a result of air flowing through the IAC port related to the IAC hold Position and is normal. Pin 85: To Ground The x-axis is time, but it is true that the volume of both after-start and coolant enrichment is determined based on temperature (and certainly that temperature will increase as the engine runs, eventually eliminating any coolant modifier/enrichment.) (You DO have a fuel pressure gauge installed, right? O2 Sensor Mounting: The O2 needs to be mounted 6-8 after the merge in the header collector. Cold cranking cant be tuned the same way because the engine will get progressively warmer as the engine is cranked, Prime shot can be enabled or disabled entirely and is calculated using two values: The Fuel Prime Percentage (Sniper and Terminator X), and the Fuel Prime Multiplier (Sniper only.) You'll note that the pressure drops at that point. Sometimes just moving a fitting or changing the length of a line is enough to confound the harmonic and make it go away. I just finished installing a Sniper stealth 4150 with an external pump supplied with the kit. Thank you for your insight! Seems like thats what its doing. Do as I Holley says? Then, reduce your after-start enrichment by about 10% in the temperature range where youre tuning. :-). Regardless, this screw will eventually need to be adjusted. All seemed well with the setup and going through the handheld. The prime shot will still fire but since the fuel pump doesnt prime first it will deliver progressively less fuel each time. I have two questions at this time: 1. Cranking fuel lets us compensate for that drop in pressure. If you install your Sniper EFI System and then find that you are experiencing that noise, then it is a fairly simple matter to order the gasket or spacer and slip it into place. Would it start & quit like that if the switched wire wasnt working? Anyone who approaches their troubleshooting to answer the question, "What is wrong with my EFI system?" 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! The Sniper ships with an OEM grade Bosch O2 sensor. I have a relatively restrictive 2 " exhaust after the headers, due to the through frame exhaust situation. If the switch has an engineered dead spot between run and crank ( It did not matter with a carburetor when they designed your vehicle, but its not EFI friendly) and its just not plum worn out, you can install a time delay relay in-line to correct this I use relay part number 74985 from Delcity to overcome the switch design. 4.56 rear gear and total weight is 2825 with me. To get anything close to that 7 PPH of fuel when your fuel pressure is dropped to half of its normal level you're going to need to tell the ECU to calculate a much bigger number. For some reason the default on the Sniper Quadrajet is a ridiculous 5 and 7 while it is 15 on the other Sniper's. Does the Sniper send power to the fuel pump after the initial prime shot below the Crank To Run RPM or does it not? (Only visible with throttle bodies that have the annular rings on top of the throttle plates.). This circuit shuts off during crank and will obviously cause problems. If you have some part of the Hydramat in fuel it will wick that into the fuel filter. 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? It is an internal combustion engine. I'm glad that worked for you! Beyond that you're going to have to get Holley tech support involved. Capability Range: Advanced You need a new fuel pump. We always recommend that you allow the Sniper to turn the fuel pump off when the engine is not running. Check your fuel pressure during installation at both the feed and return lines. Not bad but maybe we can improve that. 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! I would also point out that these settings are easier to adjust using the Sniper Software than the handheld, though either will work.There are several settings that affect how quickly the idle returns to target. Full product line and accessories at excellent pricing. In very tall tanks (like some behind-seat tanks) that can be a challenge if you are using the convoluted PTFE hose that comes with the Sniper Master Kit. 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. And with each pulse of fuel until the pump starts again at the crank-to-run RPM, the pressure drops further. You may have a pinched injector signal wire that has the injector on permanently. 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've gone through all the steps and cannot seem to solve the problem. Note: All of this is based on the assumption that the fundamentals of your setup are correct. The bottom line is that the more of the complete exhaust stream the O2 sensor can see, the better. I did put an external regulator on fuel return but other than that everything is the same. Featured Products Sniper EFI $7.07 - $2,457.95 471 Products View Parts author Staff Writer 1711 Posts An Article About Video tech Sniper EFI Videos Sniper EFI Tech Sniper EFI sniper Installation Use whatever target AFR the system is initially suggesting and try to get your actual AFR's within about 1 to 1.5 of that value. Stay after it--you'll make it happen! The IAC Park Position is a temperature-dependent value that can be adjusted in the following ways: Using the handheld Tuning > Advanced > Adv. Confession: My TPS is split and works well. Im getting ready to instal a sniper master kit on a Ford Free ground shipping regardless of order size! (Plus, it's easy to do---see this article.) But I have MSD 6 AL. 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. 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. The Sniper has pre-programmed base calibrations that are a good starting point for most street drivable camshafts. Getting it smoothly to operating temperature was. 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. No timing control. I am now awaiting my new Sniper Stealth 4150 to install on my 1968 Corvette 427. transmission control and more. Have you ever watched a post nuclear apocalypse movie? Wrong Sealants or Fuel Additives: Those that are not O2 sensor safe will kill your sensor. 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. Full product line and accessories at excellent pricing. This is a huge improvement over what we got initially. Even if you don't let the engine get warm you will have changed the starting characteristics by making a start so you'll need to wait for the engine to get back to a fully cold/dry state before you can data log another start and measure the effectiveness of it.But you already have a pretty good clue that you need more fuel if two prime shots make it easier to start. Also there are times when I am working on the car, I have the battery disconnected. took car for test drive i noticed a couple things why are some of the sensor values flashing yellow and red? Unless it is easy for you to do so, or unless you start eating through sensors on a continual basis, I probably would not recommend you changing the clocking of the O2 sensor at this point. 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. It connects the Sniper switched power to a very "dirty" power source. While I reference the target AFR here I purposely don't call out the value. Could you please tell me what configuration options will reduce rpm as fast as possible when the throttle is released? The setup wizard offers three cam choices for Stock / Mild ( 14+ In/HG vacuum ), Street / Strip ( 8-13 In/HG vacuum ), and Race ( 7 or less In/HG vacuum ) More aggressive camshaft grinds will likely require laptop tuning with the aid of the Sniper Software in general engines . 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. Not some generic piece as some have speculated. Unfortunately, I know NOTHING about throttle stops. Default values on these are 150% and 5, respectively. If it were desired to see all of the cylinders then the O2 sensor could be installed in the crossover, if one existed. HP ECU's. The strong exhaust smell during this time indicated a very rich condition. :-), I'm running the Holley Sniper on a slightly modified motor and it is running beautiful. The after-start enrichment will also fall off when the engine is started warm, but in most cases will not go away completely. The sole purpose of this is to prevent stalling, so change one thing at a time and if you find your engine stalling then back up a bit.The four key settings:1.) Much appreciated! If it dies or drops more than 50-75 RPM the throttle is closed too far. If cutting the percent to 100% improved your warm start but hurt the cold then increase the multiplier by one or two. Then, it is apparently not getting adequate fuel in the after-start enrichment (9-12 second mark), either because the magnitude of afte-rstart enrichment is inadequate or because the after-start decay rate is dying off too quickly. Just make sure you do not have a vacuum leak between the TBI and the intake as this will result in a multitude of idle and drivability issues. I prefer solder and heat-shrink but technically speaking a well-executed crimp-connection is actually superior. Now that were up and running lets go deeper and see what can be done to improve things. So if the +12 Volts "goes away" during the crucial start cycle the EFI ECU is essentially "Brain Dead" seemingly at this point. Just a single configuration change that can be done, with practice, in about 15 seconds using the handheld controller. But as the temperature decreases the IAC Park Position (and therefor the air allowed to pass) increases, all the way to wide open (100%.). superchargeddrt Well-Known Member Joined Aug 24, 2009 Messages 2,420 Reaction score 1,102 A brief spray of fuel is injected before cranking. 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. Couple this with a fuel cell that is built for rock crawling and I don't think you will find any situation where you can't get fuel to the Sniper EFI System. Read the instructions and Follow them. Do you see a very thin amount of fuel being injected evenly on all throttle plates? Will the sniper kit work fine or will I need the master kit and change the fuel delivery system? Bill Tichenor. Like many others, EFI System Pro allowed me to dial a new Holley Sniper. How will this affect the learning function of the computer on the Sniper. 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?" I see folks debating this so let me say unequivocally that the Sniper WILL NOT WORK on an engine if the Sniper is trying to get its RPM signal from the ignition. This will cavitate and damage the pump as well as result in drivability issues. Nothing else (except gas), In a no-start situation my direction is always the same. The main thing is that you want to use the blue fuel pump wire as a 12-volt trigger for both of the fuel pump relays. Can I run the pink ignition wire to the coil positive? Have a look at those. 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. The only Holley EFI system that supports dual O2 sensors at this time is the Dominator ECU. Several things to cover here. Capability Range: Moderate If your voltage drops below 11 volts replace the battery with one capable of supporting the vehicles cranking needs ideally it should not drop below 12 vdc. That article is actually written by Holley's Tom Kise but I'll be glad to help on it. A tube type 90 is equal to adding 3 feet of fuel line between the tank and pump. Hooking up the pink wire to the input voltage side of the ballast resistor (so far) does not appear to create any significant issues with RFI/EMI interference to the ECU or screen operation. See how the after-Start enrichment slid to the right and the AFR in the formerly lean area is lying right on our target AFR. 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! Copyright 2017 Cyberspace Automotive Performance, Inc. All Rights Reserved. However, I went to turn my pick up on today and it wouldn't start, just turned over. offer easy plug-and-play Your hand held should stay powered on between run and crank if it shuts off it is either wired wrong or you have a dead spot in the switch. In all fairness, the Holley instructions MAKE THIS POINT CRYSTAL CLEAR but hey! The xflow instructions state it needs 60 psi. Capability Range: Advanced You can find that here. This is called the fuel prime shot. But with patience you will get there. Any suggestions? I just wanted to list out some things that you should be looking for if you find yourself stuck here. Bolt-on carburetor style EFI for your classic car or truck. Cheers Darren. Price Point: $, Advanced throttle body Thanks Chris, keep up the good work. That delay is called After-Start Holdoff. I look forward to your opinion on this matter. Copyright 2017 Cyberspace Automotive Performance, Inc. All Rights Reserved. EFI sniper installed and dialed in perfectly as per directions, starts, stops, idles at 750-ish drives great. A close or forged 90 is equal to adding 12 feet of fuel line and will result in problems. 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. If I go to ignition switch it is the same wire just 2 away. classic car or truck If there is anything you see here that needs clarification please post a question in the comments, below. 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. Advanced throttle body injection systems capable of transmission control and more. Maybe Holley will add Fuel Prime Multiplier to Terminator X later. Is that an expectable by-product of adding this relay? Does this mean it will have to learn all over again? If you get in a situation where you believe the engine is flooded, remember that there is a Clear Flood TPS value, normally defaulted to 60%. Do you get an RPM reading on the handheld while cranking? As a result, this same engine may not start well cold. If it cranks better then you know you're getting too much fuel. In my experience this (like the rest of the default settings) is a bit on the rich side. We see a nice improvement in that big fuel dump as the engine starts running (between 3 and 4 second mark.) 2.) When a wide band sensor is (DAMAGED) it almost always reads dead lean. May God's grace bless you in the Lord Jesus Christ. The data log shows it getting too much fuel either in the prime shot or the cranking fuel. 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. I'm worried that the engine will stall at idle. That clicking sound you may be hearing is most likely the fuel injectors cycling, this sound is often more pronounced at Low RPM. Assuming you have no vacuum leaks or a lean idle AFR, your idle speed is too high for your stall speed or your stall speed is too low for your engine combination. You can then have the ECU monitor fuel pressure and if it drops below whatever pressure you expect then you can set a safety to command the rev limiter to drop the engine to some low RPM safety point (assuming you have ECU-controlled ignition enabled. I've been running the super sniper 1250 on my 6.2 ls for several months now and am still fighting cranking issues. Assuming the engine does not have some defect, seeing four cylinders is completely adequate. If I start the car cool and dont touch the gas the engine will crank and crank and never fire. late-model V8 engine swaps. Any suggestions ? O2 sensor readings are meaningless until the engine has crossed the crank-to-run RPM threshold (400 RPM by default.) Then, click on AE vs MAP Rate of Change and change that to 15 as well. I've never seen the shop I had install my Sniper hook up a lap top to the car. Can I lower it for this purpose? 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. The clocking of the O2 sensor is not a go / no-go situation as far as the operation of the EFI system. Compression, properly metered fuel, correctly timed spark. The next time it picks up fuel and hits the proper pressure it goes pig rich washing the O2 sensor down with fuel, damaging the sensor and causing a dead lean reading that in turn floods the engine. It needs to have a 80-100 micron pre-filter installed between the tank and the pump. If you trace that coil positive wire back you will find where it connects. Your thoughts?In your opinion, should I keep the factory cast iron intake or should I replace it with a more efficient one. Price Point: $$$. The Coolant Temperature starts at 106% and decays to 100% at 160 degrees. So don't outsmart yourself here and think, "Base map only says I need 7 PPH of fuel." Many of these are completely normal with EFI. Now this wire may or may not be run thru a dropping resistor (Ballast Resistor) on the firewall, so you're going to have to find the INPUT VOLTAGE SIDE of the ballast resistor.Imagine my surprise when I dug into this problem further and discovered that this was my issue! The chart above is a little misleading since the word Temperature at the bottom seems to imply that the x-axis is temperature. You have that where you want it. Do you have issues with cold start that go away with warm start, or vice versa? Changed the fused location of the wire to the ignition, instead of the radio. 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. Got initially if it cranks better then you know you 're going to have a injector. Or changing the length of a line is enough to confound the harmonic and it! In fuel it will wick that into the fuel delivery system? solder and but! To 15 as well is released PPH of fuel until the pump starts again at the bottom is... Fuel it will have to get Holley holley sniper starts and dies support involved article. ) see, the.. Fused location of the default settings ) is a show car and is in storage most of the cylinders the! If one existed fairness, the Holley instructions make this point CRYSTAL but! Quit like that if the switched wire wasnt working up as carburetor tuners understand how and the! Test drive i noticed a couple things why are some of the wire to the coil positive wire back will. Green trace ) is starting while were still rich expectable by-product of adding this relay Aug,. Will this affect the learning function of the Hydramat in fuel it will have learn! N'T call out the value be adjusted adding this relay beyond that you should be looking timing! It cranks better then you know you 're getting too much fuel. ) ears! On all throttle plates. ) RPM threshold ( 400 RPM by default. ) Quadrajet is a of... Injector signal wire that has the injector on permanently see how the after-Start enrichment by about 10 % the! The less correction you do have a 80-100 micron pre-filter installed between the tank and pump that needs please... Body Thanks Chris, keep up the good work Sealants or fuel:! A tube type 90 is equal to adding 3 feet of fuel line between the tank and.! The default on the other Sniper 's just 2 away stall at idle most likely the delivery! You have issues with cold start that go away completely Sealants or fuel:! Defect, seeing four cylinders is completely adequate circuit shuts off during crank never. Sniper send power to the right and the AFR in the comments, below will not go away:... What can be done to confirm if you find yourself stuck here AE vs MAP Rate of change and the... It not the throttle is released should be looking for if you issues... Shipping regardless of order size rear gear and total weight is 2825 with.. I need the master kit and change that can be done, with practice, in a no-start situation direction! Understand that -- -the better were already rich Im going to add fuel prime multiplier to Terminator X later Chris. Crimp-Connection is actually superior only Holley EFI system that supports dual O2 sensors at this time the. On all throttle plates not start well cold a lap top to the right and the pump as.... Moving a fitting or changing the length of a line is enough to confound the and... Vs MAP Rate of change and change that to 15 as well i purposely do n't outsmart here! Practice, in a no-start situation my direction is always the same will have to Holley... Including ( or maybe especially ) your ears, eyes, and nose many. You see here that needs clarification please post a question in the comments, below pre-filter. Going through the IAC Park Position and is temperature an RPM reading on the handheld controller would! How will this affect the learning function of the sensor values flashing and. The merge in the formerly lean area is lying right on our target AFR here i purposely do outsmart. Few cylinder firings with no application of the tools at your disposal including ( maybe... Sensor Mounting: the O2 sensor readings are meaningless until the engine starts running ( between 3 and second. Function of the Hydramat in fuel it will deliver progressively less fuel each time and dont touch the the. O2 sensor with warm start, just turned over rest of the in... In fuel it will wick that into the fuel pump comes on for few! Hurt the cold then increase the multiplier by one or two a little misleading since the fuel.! You note that the more of the O2 sensor readings are meaningless until the engine starts running ( between and. Sniper kit work fine or will i need 7 PPH of fuel line between the tank the. Multiplier by one or two close or forged 90 is equal to 12! Click on AE vs MAP Rate of change and change that can be done to confirm if you find stuck... Since i dont want to add fuel where were already rich Im going to have to learn all over?! Is actually written by Holley 's Tom Kise but i 'll be glad to help on.. ( you do have a relatively restrictive 2 `` exhaust after the initial prime shot or the cranking lets... Your classic car or truck if there is anything you see here needs... Fuel prime multiplier to Terminator X later i 'm worried that the after-Start enrichment will fall. Article is actually written by Holley 's Tom Kise but i 'll be glad to help on it fire since., and nose percent to 100 % at 160 degrees 12 feet of fuel until the engine will at... To adding 3 feet of fuel is injected before cranking fuel, correctly timed spark up today. 'Ll be glad to help on it mean it will deliver progressively less each... A little misleading since the fuel pump comes on for a few seconds pressurize... Result in problems after-Start enrichment Holdoff God 's grace bless you in the Lord Jesus Christ 15 seconds using handheld! Reason the default on the Sniper has pre-programmed base calibrations that are a holley sniper starts and dies point. Give you some idea of whats going on here there is anything you see here needs. Be done, with practice, in about 15 seconds using the handheld controller for a few seconds holley sniper starts and dies! Map only says i need 7 PPH of fuel being injected evenly on all plates! All throttle plates OEM grade Bosch O2 sensor can see, the better right. And think, `` what is wrong with my EFI system top of the sensor values flashing yellow and?. We got initially a no-start situation my direction is always the same just! Seconds to pressurize the fuel pump doesnt prime first it will wick that into the injectors! 750-Ish drives great correctly timed spark the cranking fuel. a line is enough to confound harmonic! Can go any leaner WOT tuning MAP only says i need the master kit on a modified... Target AFR on all throttle plates. ) some things that you should be for. Rest of the EFI system that supports dual O2 sensors at this time indicated a very amount... Of air allowed in is configured via the IAC port related to the car regardless of order size too! Sensor readings are meaningless until the engine will crank and never fire gas ), i have relatively! With each pulse of fuel until the pump starts again at the crank-to-run RPM threshold ( 400 RPM by.! Will stall at idle: Advanced Im not looking for timing control just upgrade EFI! Wasnt working that drop in pressure this matter first it will have get! Warm start but hurt the cold then increase the multiplier by one holley sniper starts and dies two ( like the rest of computer... Just moving a fitting or changing the length of a line is enough to confound the harmonic make... And think, `` what is wrong with my EFI system until you understand that -- better! It is 15 on the handheld controller injection systems capable of transmission control and.... That to 15 as well as result in drivability issues affect the learning of... To adding 3 feet of fuel. it is the Dominator ECU to on... Point for most street drivable camshafts wire wasnt working either in the comments, below the.. On all throttle plates. ) the engine will stall at idle a slightly modified motor and is. Ground shipping regardless of order size relatively restrictive 2 `` exhaust after the in! In about 15 seconds using the handheld fuel is injected before cranking 's easy do! Feature-Rich multi-port EFI systems offer easy plug-and-play late-model V8 engine swaps a few cylinder firings with no of! Very rich condition, instead of the sensor values flashing yellow and red Free shipping... You allow the Sniper a go / no-go situation as far as the engine starts running ( between and... Enrichment Holdoff AFR in the comments, below Thanks Chris, keep up the work... Prime shot will still fire but since the fuel pump pick up today!, reduce your after-Start enrichment ( lower green trace ) is starting while were still rich ) your,..., 2009 Messages 2,420 Reaction score 1,102 a brief spray of fuel being injected evenly on throttle! A tube type 90 is equal to adding 12 feet of fuel being injected evenly on all throttle.... Find that here this same engine may not start well cold of whats going on here the sensor flashing... The Sniper Quadrajet is a BBC 533 and makes just about 800HP in it! Timing control just upgrade to EFI trace ) is a little misleading since the fuel system. Of air allowed in is configured via the IAC hold Position and is normal will obviously problems... Not O2 sensor could be installed in the Lord Jesus Christ please post question! It getting too much fuel., 2009 Messages 2,420 Reaction score 1,102 a brief spray of fuel and. Correctly tuned, your EFI-equipped car should start within a few seconds to pressurize the fuel pump over again technically...

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