A faulty ignition system is a possible cause of a engine backfire. At idle and cruise, the number of sparks fired is adjusted to maintain a total spark duration of approximate-ly 20 degrees (crankshaft), assuring smooth idle, improved throttle response, and eliminating the lean surge characteristic of some late model emission controlled vehicles. Even though in these days of smart phones, iPads, and specifically in our world, self-learning EFI. FiTech's Ultimate LS kit comes with a knock sensor control and is custom cam friendly. FiTech EFI Tuning Forum. I HAVE CHECKED AND REDONE THE SPARKPLUG WIRING TO DISTRIBUTOR CAP ABOUT 30 TIMES NOW. Sticking (or wear) problems with the high pressure control regulator can cause engine surging (most commonly noticeable at lower rpm and at idle), as well as intermittent engine shut-off during low speed braking and/or when approaching a final stop. 1, afrs and IAC are fluctuating wildly, but so is the idle, Decide that I will re-write the calibration again. The dazzling example featured here, chassis GT40P/1074, earns bonus points for at least three reasons. the "nearly" is that it does have some hiccups in idle, and it idles at 600 RPMs. Bogging under light acceleration. Fuel-system misfire symptoms will suddenly appear and are often more noticeable at idle than at highway speed. Have a slightly rough idle that steadily increases to a vibration or miss(?) at about 2-2500rpm. On the idle down, a few times it seemed to take a bit longer to return to idle speed, so might need to make adjustments there. No other form of power generation comes close to deliver- ing so much horsepower for so little money. Only at www. Installed the Fitech and immediately developed a backfire through the throttle body. I decided on the Retrotek Speed Boss EFI 750 CFM system for a few reasons: 1. Both kept defaulting to the HP numbers rather than CFMs. pdf), Text File (. FAST is the leading developer of electronic fuel injection systems, EFI components, intake manifolds, tuning tools for high performance and street applications. I'm just in the initial driving phase of my Terminator install. Most of my rich issues were at off idle and transitioning to cruise level RPMs. I made a wide open throttle run from 2nd thru 3rd and it was gone. After warming up to 170 idle improved a bit, but I want to get some feedback from FiTech before taking blind guesses at what to set. Un-tie the string and allow the rpm's to come down. It also monitors valve timing through the camshaft position senso r. It used to only happen in OD, now I've noticed it also occurs in 3rd. And I've noticed that it seems to take a bit to long to return to idle. Do a compression check, if one cylinder is low readjust the valves, while you're doing that you can make sure no rockers or push rods are bent. Just for ppl to go to so they can read up on tuning procedures and troubleshooting. Drop base air cleaner for 79 TA with Pontiac 455,RPM intake & Holley 950HP carb? I have to richen up the idle circuit or it will pop and backfire at cold start. I have some tuning questions and will call after the holidays. If this is your first visit, be sure to check out the FAQ by clicking the link above. FiTech EFI is dedicated to bringing the most advanced fuel injection systems on the planet supporting engines with up to 1200hp, 2X4, nitrous, boosted, and E85. New to FiTechAnswers to help you understand the capabilities and features available105 Topics · 853 PostsLast post: New member setting up a new system …. While temporarily ignoring the IAC Position, adjust the idle speed screw to the Target Idle Speed RPM (in Idle ICF). You may have to register before you can post: click the register link above to proceed. I have to say the two plugs I pulled just now are not nearly as clean as the first one I pulled yesterday. It starts cold just fine, then according to the dash temp guage, around 130 F a very, very loud vacuum rushing sound starts and then engine begins to shake like misfiring. I will have a local tech library setup shortly It will include Technical Documents, Firmware Updates, ProCal Installer T195B RevA « Last Edit: March 11, 2019, 05:16:26 PM by Wheelman ». Higher idle is usually a sign that the throttle plate is not set up properly or you have a faulty IAC motor. Random misfire when cruising. New MSD on and still have the backfire. most helpful tool drawers. Adjusted to 32* (2500 RPM) and backed out all the way on the vacuum advance (which could have been the source of the erratic idle AND the pinging). Also includes links to relevant forum topics on the code. We will see how this compares to what the "target idle speed" is set at in the chip. There's a how-to guide on that at the FiTech site, but I can walk you through it if you want. All this translates into an improved combustion process in the engine's combustion chamber that you will feel in throttle response and a smoother idle along with better high RPM performance. It was an easy choice for me. In fact, I believe the Holley HP/Dominator ECU is more sensitive to idle tuning (idle algorithm), than the Commander 950 is; meaning it's easier to achieve a good idle with the C950. Bogging under light acceleration. I will have a local tech library setup shortly It will include Technical Documents, Firmware Updates, ProCal Installer T195B RevA « Last Edit: March 11, 2019, 05:16:26 PM by Wheelman ». Im ready to yank this POS off and go back to a carb. Both kept defaulting to the HP numbers rather than CFMs. txt) or read book online for free. For engines to run efficiently, the spark plugs have to ignite the air and fuel at the right time. New to FiTechAnswers to help you understand the capabilities and features available105 Topics · 853 PostsLast post: New member setting up a new system …. Hey John I was hoping you could lend a hand here. What more can I say, Tech installed on 69 Chev truck, SBC Stroker broke in with Double pumper Used the Command Center and put this set on. Random misfire when cruising. Testing O2 Circuit I am working on a newly acquired '64 Comet, with a 5. 5-19 steady at idle. I blamed the EFI and didn't really feel like refreshing my memory and skills on that system and had been reading a lot about the FiTech that had been out about a year at the time. Engine is popping thru throttle body starting at 2000rpm. Hello, so there's no easy answer for this - but I'll do my best to explain. Not sure if it’s ignition, fuel or a vac leak but I sprayed around at idle and nothing changed. ive tried different accelerator pump nozzles and even swapped out jets with originals. This is what FiTech uses at cranking, so, it seems to work. Andblipping the throttle for a downshift can cause it to backfire out the pass. Our injector cleaning service is available to the automotive, motorcycle, marine and other related industries at a fraction of the cost of new or even refurbished fuel injectors. Can I use a wet nitrous system injected under the fuel injection and then into a Weiand 6-71 blower? Jeff Smith: From your photo, it looks like a great project. Engine is popping thru throttle body starting at 2000rpm. Unfortunately, these variables are all inter-related. I think MOST 70s Cad EFI owners don't want a huge project, they don't their cars out of service a long time, they don't to become tuners, they. To the best of my knowledge that parameter isn't modified over time by the PCM, it's a set table in the base programming. After exhaust leaks and IAC steps are squared away - hit the road!. Got the back where it belonged. Holley® has been the undisputed leader in fuel systems for over 100 years. But it also took some serious fab work to get there. Seems there's an "advanced" screen you need to get into? Will the car start/run/idle reliably as long as you don't get too wild with the throttle movements? CBODY67. So, if the engine isn't smoothly rotating, then this approach could "backfire. Decided to go for a Street Demon 625 with phenolic body, as the car is quite original. I was always showing 18-20 degrees at idle and thought it should be around the 10 degrees I set the dizzy at. The clamp style o2 bung was leaking so i welded one in and no change. thay took my hard earned money and said sorry to me. Incorrect timing can lead to the fuel being ignited before the manifold intake valve closes, causing a backfire through the carburetor or exhaust. I HAVE CHECKED AND REDONE THE SPARKPLUG WIRING TO DISTRIBUTOR CAP ABOUT 30 TIMES NOW. HRET: The FE engine is currently enjoying a resurgence in popularity, probably due to their place in ‘60s muscelcars. Just like with a new carb, you must. I am going to go with FI Tech. Since 1938, Edelbrock has manufactured its core products in the USA for quality & performance. You may have to register before you can post: click the register link above to proceed. There are some YouTube vids on the FITech system's quirks and such. The car generally runs pretty well, but will pop (out the intake I believe) on occasion when applying very light throttle, and occasionally idle roughly. OK, I have a Pontiac 400 that is about to make me pull my hair out. The fuel injection systems fitted to all the bikes we now sell are, by definition, digital control systems. The only other I would consider is the Summit version. Also, if you car sat for that long, your carb is due for a rebuild for sure. FiTech may want more air moving. What size cams and engines are you EFI/Fitech I dropped my idle down to 13. Zerys is a comprehensive content marketing platform that makes it easy to plan, produce, edit, and publish extraordinary content your readers will love. Use the tach to help you adjust the idle mixture screws evenly to create the highest idle speed. OP has changed the fuel filter. bad timing. Read honest and unbiased product reviews from our users. Not a backfire up through the throttle body,, but a Backfire out the pipes. 64/107 different day I admit , slightly cooler The car felt like it was pulling harder than before , then seamed like I let up on the throttle. Any of the above require a bunch of new wiring. Started by dubvalman. On the *lean* deal what I was seeing is that there is insufficient fuel to ignite in the cylinder (with just idle circuit feeding it) so it goes unburned into the pipes where it accumulates then ignites due to maybe another cylinder that does fire of from a hot spot in the exhaust system. Fitech sent me a new one and it does the same thing. They have a FiTech forum that even FiTech themselves could probably learn a thing or three from IMO. , Automotive, 0 replies 2001 mazda Sputters after it rains?, Mazda, 11 replies car makes whistling chirping sound when idle and sputters and low speeds, Automotive, 6 replies Does prolonged engine idle on a slope cause engine damage?, Automotive, 43 replies. The computer senses engine load. These products are shortlisted based on the overall star rating and the number of customer reviews received by each product in the store, and are refreshed regularly. 0 HO and AOD swapped in it. If the idle speed exceeds 900-950 rpm, use the idle speed screw to slow the engine down. Well, just got finished with my Wide Ratio AOD install on my '73 Montego. However, there’s roughly 90 degrees of crank rotation since the last (base timing) crank trigger. I take ABSOLUTELY ZERO CREDIT for the length of material you're about to read, however I have made a few comments in-text that you can see which I will highlight in green. The Deceleration Pop Problem Decel Pop is many times a nasty issue to deal with. Second priority is going to be making sure your IAC steps are between 3 and 10 at warm idle. backfiring, cranking. i have a 1978 jeep cj5 and i had a 1978 AMC 304 out of a jeep rebuilt from ground up and the jeep has fenderwell headers. Fuel injector cleaning service and flow testing at Injector RX is cost effective and comes with guaranteed results. Because the manifold will be dried out during the time of no. The solenoid controls oil flow through a. my friend had his switched and it was a. Vic SR was a racer and made products with that in mind Jr is a business man selling what is junk in my opinion. 14,791 likes · 142 talking about this · 119 were here. I can't bring the idle up even 50-100 rpms with the throttle. It's been great here weather wise these last several days and I haven't been on the net but a few mins here and there. We jetted it down for the altitude we're at (6000 feet), and it's still rich at idle. A faulty ignition system is a possible cause of a engine backfire. All this translates into an improved combustion process in the engine’s combustion chamber that you will feel in throttle response and a smoother idle along with better high RPM performance. The car runs cooler with better throttle response. Our tips on how to get horsepower the cheapest way with carb spacers. I set idle to 8 degrees and revved it up with the timing light on. Some later Datsuns have a solenoid that holds the throttle open slightly during deceleration. com, the official. As long as your engine gets back to your target idle, the IAC is doing its job. ive tried different accelerator pump nozzles and even swapped out jets with originals. This is what FiTech uses at cranking, so, it seems to work. truck recently started idling really rough, stalling at times with exhaust popping sounds. Sometimes referred to as a 2-step or launch controller, the LNC-2000 adjustable RPM limiter and timing retard controller can be used to provide consistent launch RPM off the line in drag racing and other standing start r. Hasn't done it since. Upgrading to Gen III LS-Series PCM: Sensors and Inputs Guide includes instructional photos, checklists, and step-by-step instructions on upgrading to the GM Gen III LS-Series PCM, ECM, Electronics, and POWERTRAIN CONTROL SYSTEMS. Dialing in the MegaSquirt Startup Sequence So, you've just installed a MegaSquirt, and are having trouble getting the engine started? With MegaSquirt, or any standalone engine management system for that matter, the startup sequence is something that needs to be tuned for your engine. Misfires can occur at idle, when the engine is pulling hard under load, at high rpm and during throttle transitions as the air/fuel mixture changes. Then I'd factory reset the FiTech to get rid of the bad info it's learned. Serious rich condition at part throttle, some backfires, spitting and sputtering during acceleration. Vic SR was a racer and made products with that in mind Jr is a business man selling what is junk in my opinion. DFCO cutout and return moved down to almost 20 and 24 respectively, ( to reduce decel backfiring through the pipes), Loop up and down at 33 each, ( to aid in quick return to idle) FCC low power reduced to 38. Why does my engine spit or backfire? First off, you need to determine whether it is backfiring out the exhaust or back up through the carb. Its no different than a Chevy, don't worry about initial timing at first, get a dial back timing light and set advance to 36 degrees at 2800 RPMs then see where the idle timing is but if you want to just set the timing mark to the top of the tab and drive to check for pinging and starting issues then move down the tab 2 degrees until it don't ping and it starts when hot. An idle system will have an idle jet/restriction that must be changed to supply the desired fuel mixture for idle and off idle engine demands. it is been experiencing a very rough idle, backfire with flame coming out of the throttle body. To contact the administrator click here. If the pressure is too low, the engine does not start. Not sure if it’s ignition, fuel or a vac leak but I sprayed around at idle and nothing changed. You may have to register before you can post: click the register link above to proceed. 4:1 cr, Comp 280h cam 230/230. my friend had his switched and it was a. A primer will have your MFI engine starting like a carbureted engine. 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. Seems to idle fine, but will rev up in park, but will not hold a higher RPM steadily. I made a wide open throttle run from 2nd thru 3rd and it was gone. Holley Sniper EFI and RobbMC Surge Tank, 351c and FMX. Shop ignition coils in store or online now!. Just pulled trigger on FiTech Idle timing starts at 900 I broke a sparkplug today and swapped with a spare and now it won't run it just backfires through tail. An idle air motor would require major mechanical changes to the throttle body setup. Or you can do a Minisquirt if you're feeling crafty for roughly half of the FiTech stuff. Now I just need myaoS Holley carb. I would check any accelerator pump for proper operation, due to it being on acceleration only. i had to hold the gas pedal just to keep it from stalling. Decel RPM Decay = When the throttle is closed, and the engine is returning to idle speeds, the Idle Closed loop will use Target RPM to control the speed during that period. One thing that might help is a FITECH or SNIPER throttle body EFI. Edelbrock is the most respected name in performance. We will see how this compares to what the "target idle speed" is set at in the chip. Random misfire when cruising. it only has a mag pickup window switch. FiTech EFI Tuning Forum. A community for fans of the classic Dodge Charger. When pushing the engine I see the pressure dropping by around 1. I just installed a 2004 5. Make sure your idle RPM is above the start retard setting in order to set your timing correctly. It could even be an Ethanol-related problem - vapor lock. Set between 15-20. ACDelco 25832864 GM Original Equipment Accelerator Pedal with Position Sensor; Qlhshop 2 x Black Motorcycle 1 Inch Turn Signal Switch Handlebar Control Switches + Wiring Harness f. com AAA Piano is the leading piano service provider in the greater Sacramento Area & all of Northern California. The same tricks that work on Retrotech will probably work on FiTech as it's the same guy and probably not a huge change in the program. If you down shift and decel the engine being spun up a little keeps it from stalling. I could still use my stock intake manifold (which is factory), and if I ever get around to upgrading that stock manifold to an Edelbrock Pontiac Performer manifold, I can still use this fuel injection system. 7 being the industry standard stoich AFR value, we typically like to see these conditions run slightly richer. The solenoid controls oil flow through a. Compressor stall was a common problem on early jet engines with simple aerodynamics and manual or mechanical fuel control units, but has been virtually eliminated by better design and the use of hydromechanical and electronic control systems such as Full Authority Digital Engine Control. Since 1938, Edelbrock has manufactured its core products in the USA for quality & performance. Read more here to find out what you need to know to tune your engine properly with the ideal AFR for your engine and operating conditions. Smoother than the 570 Street Avenger with the 2 screw. When you have a bad oxygen sensor, your vehicle will run less efficiently, it can sometimes have a poor idle, erratic jerking at steady throttle, hard starting problems, cause the check engine light to come on, and will cause high fuel consumption. And, the prices are now comparable to that of a carburetor. Holley® has been the undisputed leader in fuel systems for over 100 years. Running an MSD 2 wire dizzy locked out. Did Not Blow Up My Motor! FITech is relearning the parameter's that it was OK, bummer day. If your engine is chugging at a stoplight but smooth at speed, take a hard look at the fuel system. It makes sense now that if I phased the rotor 10 degrees, my idle timing on the handheld would be around the 10 degrees I set it at. We are unbiased, we don't care if you drive a Ford, GM, Toyota, BMW, boat or anything else. OP has changed the fuel filter. 1980 - 1986 Bullnose F100, F150 & Larger F-Series Trucks - Wish me luck Fitech go street EFI 400 - So I have always wondered about the aftermarket efi systems. Knebel, what is your vacuum at idle? Does your car have a fairly rough idle? I have heard that there are basic parameters you put in so it can have a base map to start with. Direct fuel injection systems operate at fuel pressures from 500 Psi at idle all the way up to 3000 Psi. Don't adjust the plates unless something in the FiTech manual says to do so. The tired old Carter Thermo-Quad 6139S of my'72 Challenger 340 with A727 needed replacement. • erratic idle, drops from 1,500 rpm to low hundreds in a few seconds, when the idle is stable it is at 1,100-1,350rpm although the unit is set to 950 rpm • car stalls when coming to a stop unless kept in gear • backfiring on deceleration The mechanic who is troubleshooting the system can't figure it out and MSDs tech line has been no help. Anybody have any ideas?. I could still use my stock intake manifold (which is factory), and if I ever get around to upgrading that stock manifold to an Edelbrock Pontiac Performer manifold, I can still use this fuel injection system. Sometimes referred to as a 2-step or launch controller, the LNC-2000 adjustable RPM limiter and timing retard controller can be used to provide consistent launch RPM off the line in drag racing and other standing start r. Although there are many problems that can cause the intake system to backfire, the overall effect is the same. OK, I have a Pontiac 400 that is about to make me pull my hair out. Detailed information on troubleshooting and repairing a P0505 DTC code which refers to a malfunction of the IAC (Idle Air Control) system. 2Ls, but Im not going to buy one just to try (maybe I can convince my brother to get one for his 289. Enjoy the videos and music you love, upload original content, and share it all with friends, family, and the world on YouTube. Cure The Bog And Sluggish Response On Your Holley Four-Barrel Carburetor By Properly Adjusting The Accelerator Pump Assembly. Holley's popular Terminator X lineup has now expanded to accommodate Ford based applications using 289-302W, 351W and 460 engines. It made no difference. The Target RPM will decay to the normal idle speed in a controlled manner. The tired old Carter Thermo-Quad 6139S of my'72 Challenger 340 with A727 needed replacement. An overly advanced condition will cause backfire through the carb and overly retarded will cause backfire through the exhaust. m_m70, Yes I have the FiTech controlling the timing. It then uses that VVT data to determine the best valve timing for the current conditions. Starts right off of idle. Drop base air cleaner for 79 TA with Pontiac 455,RPM intake & Holley 950HP carb? I have to richen up the idle circuit or it will pop and backfire at cold start. I think MOST 70s Cad EFI owners don't want a huge project, they don't their cars out of service a long time, they don't to become tuners, they. Idle Return: If the engine is not returning to idle quick enough for your liking or is dropping too quickly and killing the engine then you may need to adjust the rate at which the injection system comes to an idle. An EFI conversion allows the engine to fire immediately with the first crank, to idle smoothly whether the engine is hot or cold, and to accelerate without any embarrassing pops, sputters or bogs. If pushing the accelerator does not prevent the engine from stalling, there is a problem with fuel delivery. The same tricks that work on Retrotech will probably work on FiTech as it's the same guy and probably not a huge change in the program. How to Build Chevy Big-Blocks: Intake Manifold Guide Includes in-depth instruction and photos. Higher idle is usually a sign that the throttle plate is not Holley Sniper EFI and RobbMC Surge Tank, 351c and FMX. Fitech needs to setup a forum board for customer support. like an engine hiccup along with the hiccups i get backfires out of the exhaust and the throttle body. The car has a very mild 351C 2V with and Edlebrock Performer, and a 700 Holley double pumper carb. Only two that were different were the idle and 1100 values. 0, the cruise setting is 13. Now this 570 is a lean carb , but does it's job out of the hole. (1700-2500 RPM). Random misfire when cruising. With the throttle at idle, fuel and air mix here to keep the engine idling. hey i dont know much about carberaters but ive got a thirsty 460 super cobra jet with a 850 double pumper and ite running real rich but i really dont konw the first thing about tuning a carb, ive heard that holleys are known for getting out of tune pretty quick and it was running fine up until a few days ago then it just started idling rough and didnt want to stay running at idle i dont know. I also increased all my fuel pump control percentages, because I am running a 60psi in-line pump. Edelbrock has been delivering the best combination of dyno proven electronic fuel injection performance for over 40 years. Car did run noticeably better, but still missing. Find helpful customer reviews and review ratings for MSD 2900 Atomic EFI Master Kit at Amazon. I am using the stock ECU from the LS1 2002 Camaro, with the 24-58 reluctor converter, injector adapters and needed sensor conversions, Texas speed and performance has done the basic tune. Vic SR was a racer and made products with that in mind Jr is a business man selling what is junk in my opinion. Set them for the idle and leave them until you change the main jets. With a retail price of just less than $1,000, it offers. When I start it, it will go to 1000 rpm and then settle down to 750 as it always had. The same tricks that work on Retrotech will probably work on FiTech as it's the same guy and probably not a huge change in the program. Started by dubvalman. I could still use my stock intake manifold (which is factory), and if I ever get around to upgrading that stock manifold to an Edelbrock Pontiac Performer manifold, I can still use this fuel injection system. So after 5 months of fussing with it, I gave up (not something I like to do) and purchased a Holley Sniper EFI system. Rebuilt 400 stock internals- comp cam something like (NOT EXACTLY!!) 246-269 with. had a friend diagnose after getting home as having about a quart of gas in the oil pan. 14,791 likes · 142 talking about this · 119 were here. My AFRs are much more stable. Crown Automotive is just the ticket if you want to get the most out of your vehicle as well as revel in a more exciting driving experience. Idle BasicsAll carburetors come with a simple yet efficient idle circuit. Use the idle speed screw to set the idle at a comfortable warm-up speed. There were some minor issues with idle speeds and lack of engine braking but got the vehicle to the point 7 0 28 1546264739. Welcome to the Yellow Bullet Forums. Not sure if it’s ignition, fuel or a vac leak but I sprayed around at idle and nothing changed. As it works out that feed did not supply full battery voltage during crank. We jetted it down for the altitude we're at (6000 feet), and it's still rich at idle. I have misfiring at 5200 rpm. Corvette: Why is My Car Hesitating? The Corvette is a very powerful car, and when it hesitates, we feel it. Maybe idled for 15 seconds or so, got it to 1000 rpm, then carb backfire, stop. With EFI, the idle speed is not changed by the throttle plates. is a idle surge caused by too lean a mainjet, just. Start the engine, the engine will run very slowly more like a tractor. A smaller “Decel RPM Decay” value will be SLOWER. If this is your first visit, be sure to check out the FAQ by clicking the link above. At idle and cruise, the number of sparks fired is adjusted to maintain a total spark duration of approximate-ly 20 degrees (crankshaft), assuring smooth idle, improved throttle response, and eliminating the lean surge characteristic of some late model emission controlled vehicles. • Click on the Idle Speed tab at the top. Let your throttle body (TBI) or multi-port fuel-injected engine breathe! Choose a performance throttle body from our massive inventory and improve horsepower, drivability, and overall engine efficiency. MANY of them, from what I've seen. It also monitors valve timing through the camshaft position senso r. 9L gas engine. Shut down and give your engine it's first oil and filter change. The lack of FI is the only thing holding it back. Followed the iac step recommendations and got mine at 6, still does it. There are limits set up within the ECM that only allow it to move the IAC in and out of the idle air passage so far. Do a compression check, if one cylinder is low readjust the valves, while you're doing that you can make sure no rockers or push rods are bent. The FAST unit Im not convinced FiTech would not work after seeing it run on 4 cyl engines which presumably move less air at idle than our 3. I lost some bottom end but not much. On a whim I purchased a used MSD Ready to Run distributor off of ebay for like $100, dropped it in, and with no other changes it was a night and day difference. all cylinders checked out BESIDES cyl 8 and 3. The 304 & 360 CID Engines from '78 to '90 used the same Motorcraft distributor for all variations. Can free cord seat know 820 obituaries tieu lee suceava woodlands reunion download ga que back status zur postal document wikipedia biceps djsi maths dnia 41?. Since the intake valve needs to provide the engine with a proper balance of fuel and air, a backfire occurs when that balance fails. That being said, it could be that FiTech sets up the unit with the plates further open at idle that the Q-Jet plates. I noticed right away that I did not smell the stick of a lean running engine and the place on the ride where I dump the clutch and slow down on the hill into the neighborhood I did not get the typical backfiring that happens every other time. 0 from original FItech default setting of 13. It also will idle fine for me too after a good 15 minute drive or so. Jetting did not help. It runs the fitech efi. CATALOG FORD PARTS. 5 power valve. The engine would hardly idle at all. They have a FiTech forum that even FiTech themselves could probably learn a thing or three from IMO. But FEs were used in lots of non-performance vehicles, too, and there seems to be an unlimited variety of these engines. Modern compressors are carefully designed and controlled. Dan agreed to give it a try – I had let him borrow my FiTech Command Center when his was not working so he was returning the favor. its smooth and stays at the desired rpm i set it at (750) during cruise (part throttle) the car seems to run fine. Catless exhaust, EFI, stink? 1 2. Fuel injector cleaning service and flow testing at Injector RX is cost effective and comes with guaranteed results. Random misfire when cruising. truck recently started idling really rough, stalling at times with exhaust popping sounds. It occurs mainly when under a slight load/acceleration. Starts right off of idle. With EFI, the idle speed is not changed by the throttle plates. Decel RPM Decay = When the throttle is closed, and the engine is returning to idle speeds, the Idle Closed loop will use Target RPM to control the speed during that period. FAST EZ-EFI Poor Fuel Mileage and exit the truck will run at a faster idle speed for some reason. Mine is a E85, single turbo blow-thru 360. offroad peice of sh!t box. Completely random backfire through throttle body. 7 being the industry standard stoich AFR value, we typically like to see these conditions run slightly richer. The "minimum idle speed" must be less than the "target idle speed", otherwise, during normal operation, the IAC pintle could bottom out on the air passage seat of the TBI, and damage will occur to the stepper motor of the IAC control. Started by mechanicmarcus7. We design and engineer automotive fuel injection products for. Holley's popular Terminator X lineup has now expanded to accommodate Ford based applications using 289-302W, 351W and 460 engines. Followed the iac step recommendations and got mine at 6, still does it. 5 to 17 inches of vacuum at the check valve on the booster, the booster. Truck runs nearly perfect at all other times. Mine is a E85, single turbo blow-thru 360. When I switch to the 2 wire MSD and Fitech controlling the timing, the car is extremely difficult to start and keep running, it backfires out the "carb" and out the back. I now have my distributor hooked up with full timing control. Have a slightly rough idle that steadily increases to a vibration or miss(?) at about 2-2500rpm. I pulled the intake off, pulled the 2 lifters out and checked the cam. Vacuum gauge shows 18. Zerys is a comprehensive content marketing platform that makes it easy to plan, produce, edit, and publish extraordinary content your readers will love. truck recently started idling really rough, stalling at times with exhaust popping sounds. Ignition Systems Cheat Sheet for the Chevy Small Block For our budget-oriented purposes we find that conceptually at least, GM's HEI distributor is a near ideal choice in terms of practicality. Cleans contaminated petrol injection systems, removes carbon deposits and deposits from fuel pipes, fuel distributors, injection and inlet valves therefore, no starting problems and no lean surging, smoother idling, good throttle response, low-pollution, and environmentally compatible combustion. This article is written for those of you having problems with exhaust decel popping. [Archive] Page 121 All drivetrain related questions, this includes 4 cyl right upto V8.