Chevy truck backfires through throttle body. The only thing that I didnt change is the return line. I drove the truck about 150 miles round trip today never an issue or a hint of one. The most common reasons for an engine that backfires, particularly through the carburetor or throttle body, are either incorrect ignition timing or valve timing. C5 Tech - Engine Backfires, and acts rough after throttle body cleaning - I am really in a bind, I cleaned my 2003 C5 Corvette with carb/choke cleaner, and after the cleaning its performance has been terrible, Im not sure where to begin, or what to correct. Once it starts after an event like this the smell of gas through the exhaust is overwhelming. Slight idle surge if left off for 4 plus hours no back fire. Could a clogged return line make it backfire and seem to miss a little? I only drive the truck 300 miles ( or one full tank of fuel) a year, and even though I've treated the fuel with Startron and only bought the ethanol-free stuff, they still went bad over about 10 years' time. Fish bite idle when in OD and lightly pressing pedal. I have timed the engine from 0 degrees all the way up to 20 degrees advanced. Been working on this 1994 Chevy S10 with the 4. 8/351W) - Backfiring through throttle body pls help urgent! - 95 351 f150 292k miles runs poorly backfires through throttle body he hopes it's an injector not spraying but dripping at idle and off idle it does this he can't afford a mechanic and needs a running vehicle he also Repetitive Engine Backfire This portion of the guide to for when a backfire is repetitive and generated when the engine is simply running at idle, or at cruising speed and can be inline with the engine RPM. To stop a car from backfiring, you should ensure the fuel-to-air ratio is correct, the ignition system is functioning properly, the engine timing is accurate, and the exhaust system is not malfunctioning. It has spark turns over backfires through throttle body. That means that the timing is too far advanced . 7 vortec. It backfires through the throttle body constantly. Dec 10, 2023 · There is no check engine lights and the truck idles smooth. It revs up fine in park and low acceleration but doesn’t like to accelerate when you step into it a bit I’ve change plugs, distributor rotors, distributor cap, esc FAQ: Engine Backfires Through Exhaust Why does my engine backfire through the exhaust but still runs fine otherwise? This is classic rich fuel dump on deceleration. Unplug cts in the morning, no backfire but low idle and slight shake. The Cause of Backfiring Backfiring is a small explosion. Changed plugs sounds like out of time. 0/302, 5. 7 vortec, been running good but I let it sit for a bit and now it barely fires up 1995 k1500 5. Mis-routed spark plug wires can also cause intake backfires, if the spark ignites the mixture when the intake valve is still open. 9. Backfire through intake/throttle body while cranking. info would be helpful . Does not seem to have a dead cylinder but will get that checked to. Does this have a module in distributor like the old electronic ignition? Chevrolet's used to have if so could this making a backfire through the carburetor like it is at a time. throttle body is closed w/ no obstrucktions,both throttle and criuse cables have slack. I have a 87 Chevy 350 that was running good but latley it has been stumbling and backfiring when you step on the throttle heavy. No start Jump to Latest 7. Apr 9, 2024 · I have a 87 Chevy 350 that was running good but latley it has been stumbling and backfiring when you step on the throttle heavy. Truck will not start. when you slowly give it throttle it seems less likely to backfire. 7 backfire out the tbi,flames!Only when you stab throttle. 3 1500 Backfiring and stalling issues Not cranking after stalling Chevy Mechanic: J Hall Hello, I would be happy to assist you with the backfiring and stalling issue. 4 engine and automatic transmission. If your Chevy Silverado is backfiring, common causes include improper engine timing, bad spark plugs, engine running rich, and plug wires (if so equipped). The engine is a Chevy 350 with a Holley that is not the original engine or carb in the spark plug wires arrange on the cap in a CLOCKWISE rotation if you have them in the Counter clock wise position. I know that these rigs are Broken valve springs? Exhaust valves that don't open, and intake valves that don't close will both result in popping in the intake manifold. for an engine to backfire through the throttle body means that the inlet valve is still open when spark occurs . Timed to spec it runs like total crap when under load, and backfires through the TBI. the throttle response is good, no hesitation or backfiring on acceleration. 3l into a 2001 jimmy, engines starts fine and idles - Chevrolet 2000 Blazer question Back firing through throttle body The 1988 - 1998 GMT400 Chevy & GMC Pickups Message Board I have seen a few trucks with worn gears backfire through the intake. 3 liter vortec with CPFI. This is a very common problem with cars today and the fix can be very easy and often times performed at home. You may also notice that your fuel consumption has changed or your car’s idle fluctuates. Bronco II - throttle body backfire - Here is the problem: I have an 87 bronco II w/ 2. Verify the crankshaft position sensor wiring and signal integrity, as incorrect timing triggers misfires. How to fix a backfiring engine by showing you the most common symptoms and solutions. changed everything!really,checked rockers,all moving correctly. 1988 chevy k1500 TBI 350. When heavy acceleration is pressed it backfires out of the throttle body. It keeps injecting fuel. . Not like a BANG, but more like a cough. Truck will not take a load at all - sputters, misses, backfires, will not get up to speed. 9K views 10 replies 6 participants last post by bk2life Jan 31, 2024 J Hey guys. The surge is like a whup-whup-whup-whup until I add throttle and rev it out. It revs up fine in park and low acceleration but doesn’t like to accelerate when you step into it a bit I’ve change plugs, distributor rotors, distributor cap, esc If it's backfiring through the carb or throttle body and runs, it's because it's out of time and the intake valve is still open during spark or because some huge carbon deposit may be hanging an intake valve up. The backfire is caused by the mixture of air and fuel in the engine not being burned completely. When i get another warm day this week i will go check the firing order and plugs. A rhythmic popping sound through the intake manifold which is not as prominent as lean, under power backfires. The truck started developing some major driveability issues that were Replace the fuel regulator in the throttle body, ive had 10 TBI S-10's ( 8 -4. I tried something earlier with the truck running actually truck running I actuated the throttle on the side of the throttle body body and sprayed WD40 around the base and it seemed to run smoother. When you let off the gas, the throttle closes, but the ECU is still in open-loop mode or getting bad data from a failing O2 sensor or MAF. The engine idles fine when warm but when accelerator is pressed, it cuts out and then revs up. 0 about a month ago for a work truck. A Chevy truck backfiring through the throttle body is a common problem with these vehicles. 7 liter 350 chevy pickup cranks but wont start backfires through throttle body while cranking it over? For an engine to backfire through the throttle body means that the inlet valve is still open when spark occurs . you will have the engine backfiring out the throttle body. Not familiar with this year distributor. Does this have a module in distributor like the old electronic ignition? The truck has 374000 miles on it so yeah the parts were likely needed. It will last 30 seconds and run fine the rest of the day. The shop figured it out on the dyno by injecting propane in the throttle body under load. Check the distributor cap, rotor, spark plugs, and wires for wear or incorrect installation. Jan 29, 2024 · I put all my accessories on the engine, got it all put together and hooked up, went to start it up, it'll crank and then backfire through my intake, what could be the problem?? Backfiring during acceleration and difficulty achieving correct ignition timing are common issues. The car backfires, and the engine performance is incredibly TIMING N FIRING ORDER IS SPOT ON . IT BACK FIRES IN THE THROTTLE BODY. My problem is while driving at higher rpms, when i let off the gas, i get lots of popping and backfire through the exhaust. What is the problem? TBI is surging with steady part throttle in open loop when cold. 2K views 5 replies 4 participants last post by chevymec Mar 6, 2022 T Backfire would be lean mixture, a broken or moving pickup coil in the dist, crossed wires (5-7 are common, 4-8 on occasion) do the easy one first, and go through the wires. Since the intake valve needs to provide the engine with a proper balance of fuel and air, a backfire occurs when that balance fails. 7L. Customer: Crank no start backfires through throttle body Mechanic's Assistant: Where exactly do you think the noise is coming from? And how long has this been going on? Customer: Backfires from throttle body been going on for about a week now Mechanic's Assistant: What is the model/year of your GMC? Customer: 2000 Chevy Silverado 4. year and eng. Although there are many problems that can cause the intake system to backfire, the overall effect is the same. Heater hose busted and sprayed my distributor which ended up corroding all the terminals in the cap over the next couple weeks and started running rough Replaced cap and VORTec 5. Timed by ear it runs best with advanced timing, but starts hard hot or cold, runs terribly cold, and occasionally backfires though the exhaust when under load. Small Block V8 (221, 260, 289, 5. I towed it to a friends house that is a ex chev mechanic and he said that it was the fuel pump. Fast idle is slow to come on Engine & Drivetrain My truck did the same thing- it was a dirty throttle body. IT wont start. I was at the shop grabbing some parts and left the truck running outside for 10 minutes. It One of the more jarring vehicle problems that you can experience is a backfire. IT may also mean that the tappet clearance is out if manual adjustment or the hydraulic followers are pumping up and holding the valves slightly open especially at revs. Engine bogs at full throttle and backfires through throttle body Jump to Latest 2. Not sure if that will fix yours, but it's an idea. It goes away after I drive it for a minute or it warms up to closed loop. I just took it out to get some gas and it died a few times cause I kept tapping the throttle too quickly. doen't always happen, 3 times the past month. C3 Tech/Performance - What causes backfire through throttle body???? - I am trying to tune my fuel injection, and sometimes I get fire back through the throttle body. Any ideas? I suspect the Every now and then (and there's no real pattern), when I start to accelerate from an idle, it hesitates and backfires through the throttle body. It sounds like a shotgun blast and can scare you if you're not prepared for it. 3's and two 2. Model specific subject matter experts, classified ads and more. I was walking back outside when I heard Everything was assembled properly (firing order) still hesitates and backfires through the throttle body I was advised to check all vacuum hoses (all good) then I changed the map sensor, knock sensor, coolant temp sensor, and all vacuum hoses and still responds the same. Open Questions: 0answers Read full answer Be the first to answer Oct 12, 2016 • 1999 Chevrolet Silverado 2500 0answers Read full answer Be the first to answer Aug 03, 2014 • 1999 Chevrolet Silverado 2500 0answers Read full Found 3 result (s) for your search 92 chevoley 3500 7. Lean fuel mixtures can cause intake pops, but typically only on acceleration. First start up in the morning , truck backfires through the exhaust and shakes with jumpy idle. Customer: 99' 5. It was a progressive thing, at first hesitation while driving with a light throttle, then hard starting, then lots of backfiring through the intake and no start. Truck Backfiring Through Throttle Body: Causes and Fixes Backfiring during acceleration and difficulty achieving correct ignition timing are common issues. sound like electrical? or some sensor going bad? could this be ECM?PLIASE HELP!!!!!THANKS!!!! I have a situation re: carb stumble and backfire under acceleration. Loosened distributor to see if it was only a tooth out. 1K views 4 replies 5 participants last post by Ross001 Dec 2, 2018 U 96 Chev K1500 350 Vortec 160K Miles No Aftermarket Stuff Auto Tranny The truck will crank over but wants to backfire and tries to kick back and stalls the starter out. it will turn fine when i take distributor cap off. 8 TBI ) A few of the 4. i have a sneaking idea that the damper and timing pointer are MISMATCHED. 3 models would hesitate pretty bad and some times backfire. 4L Vortec in my 1997 GMC Suburban K2500 SLE 4x4. I HAVE REPLACERINGS AND BEARING & CYLINDER HEAD. When I retarded the timing, it got worse. 3l backfires through throttle body just installed a 2005 4. as always, this time it backfired through the intake system, now when I start it, it goes to full throttle. Backfiring through the throttle body often indicates ignition timing problems or a lean air-fuel mixture. I have a 7. many factors can cause this type of problem . 8 Bad Throttle Body Symptoms The most common symptoms of a bad or failing throttle body include rough idle, rough acceleration, a check engine light, engine misfires, or a stalling engine. Nov 1, 2022 · The truck has 374000 miles on it so yeah the parts were likely needed. worn cam . Especially when it's been driven - shut down for an hour - and restarted. Pranks almost starts backfires through throttle body Jump to Latest 1. replaceing thie regulator fixed the problem for me, Ive went thru plugs/caps /rotors , even setting the timing and after replacing the reglator all runs well. So I just picked up a 2003 chevy 3/4ton 6. The car still backfires when I quickly hit the throttle. backfires at startup and now it goes to full throttlewhy Tried to start this morn. it turns but & one point it would come to hard crank & backfire in to the intake. 89 S-10 backfires through throttle body lack of power at acceleration and service engine light comes on after a while I've checked timing plugs and wires and did a diagnostic test and it showed nothing please help Car won't start, little backfire through throttle body Engine died while i was driving, now when you try to start it, it just turns over and has a little back fire through the throttle body Posted by pat_k_87 on Apr 22, 2009. 5. I have checked compression to make sure a valve isn't stuck open, I have separated the spark plug wires to make sure one isn't cross firing another at If it backfires when you let off the gas peddle it has air getting into the exhaust, either an exhaust gasket or cracked manifold before the catalytic converter or the emission control's Air Injection system. Not really a truck but a van but same engine and any help would be appreciated, have this 1998 gmc savana with the 5. Could a leak between the throttle body and the intake cause this?? Replaced it, and began to get a backfire through the TBI ONLY under load and in closed loop. that is my only problem. Chevy Forums FREE technical assistance for your restoration and repair. 4 auto, backfires through throttlebody at all times Mechanic's Assistant chat Customer: I have a 92 Chevrolet 3500 with a 7. Backfiring through the throttle body with flooding and a persistent security light suggests an immobilizer or crank sensor issue. Re: chevy 1500 backfire Could also be a lifter ,rocker arm or poss. 7 tbi. Ok,5. The air injection check valves (STANDARD MOTOR PRODUCTS PT#AV7) are common failure - 1988-1998 Chevrolet Pickup 4. I checked timing chain its fine. Recently the past month it will backfire through the throttle body when I try starting it. em0wn, x3guh, q1qeuw, kcnng, jpv4b, 5cud, dneaei, d6pljx, xb93f, rpyv,