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Backfire valve stuck open

The car back fired and now the backfire valve is stuck open how can you get it freed up so it will close

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Can a large enough backfire threw the tailpipe throw off your timing


no
but the back fire could be caused by a failed timing belt or chain
a back fire is just exploding fuel in the exhaust or inlet manifold caused when a valve has not properly closed and fuel fire is allowed to escape

Dec 17, 2016 | GMC Vandura Cars & Trucks

2 Answers

Have a 1991 Buick Lasabre won't start and backfires very very loud


backfire is a timing issue ,if its to far advanced it will back fire out intake ,if it backfires out exhaust its to far retarted ,you may have a bad timing gear,and or chain or belt, start by checking timing if you can get it running infact go over ignition system to look for other problems

Jul 08, 2015 | Buick Cars & Trucks

1 Answer

Son has a mazda protege dx runs rough when cold, backfires through intake, gasoline in oil, thinking idle air, but could it be injectors?


Gas in the oil can only get there threw the injector/s. One is stuck open. replace them all if it is worth the car. Back firing, I would check compression on the cylinders first, add a little oil first to all cylinders first, one or more cylinders are dry from the fuel, before putting any more money into it. Back firing threw the throttle body, could be timing or burnt valves.

Jan 06, 2015 | Mazda Cars & Trucks

1 Answer

4.5 cadillac engine sputters and back fire




  • Backfiring in internal combustion engines occur outside of the combustion chamber, and are typically the result of an improper air to fuel ratio. This can be caused by a vacuum leak, Idle air control valve, throttle position sensor, oxygen sensor, or just about any part of your emissions contorl system.


  • Backfires may also occur before the combustion chamber. One possible cause of this is igniton timing. If the timing is too advanced, the spark plug fires before the intake valves close, causing the combustion to propagate into the intake manifold, further igniting the air-fuel mixture there; the resulting explosion then travels out of the carburetor or intake and air filter. Alternatively, the engine timing may be retarded, in which case the combustion is not completed by the time the exhaust valves open, allowing the combustion to propagate into the exhaust system.


  • Improper wiring of the ignition can also lead to timing issues and backfires, or faulty coil or igniton modules.


  • Low fuel pressure, clogged fuel filters, and weak fuel pumps could cause a severe lean air-to-fuel ratio with fuel injection systems.


  • Missing or damaged catalytic converters can result in backfires out the tailpipe, but very uncommon, and usually only applies to engines set up for race applications.

Dec 09, 2013 | Cars & Trucks

1 Answer

My toyota 5e engine backfires


Engine back fires due to:
- Wrong heat range of the spark plugs.
- Spark plugs gaps too wide.
- High tension cords defective.
- Rotor, distributor cap or distributor assembly defective. (Only on distributor type ignition system).
- Ignition coils.
- Fuel pump pressure too high. (regulating valve stuck closed).

Aug 24, 2013 | Toyota Corolla Cars & Trucks

1 Answer

Backfires starting


Engine back fires due to:
- Wrong heat range of the spark plugs.
- Spark plugs gaps too wide.
- High tension cords defective.
- Rotor, distributor cap or distributor assembly defective. (Only on distributor type ignition system).
- Ignition coils.
- Fuel pump pressure too high. (regulating valve stuck closed).

Aug 24, 2013 | Toyota Corolla Cars & Trucks

1 Answer

Backfired then quit


sounds like your exhaust valves aren't opening up which means either your cam is out of round, push rods are bent/flatten rocker arms broken, broken valve stem/seat, hopefully just the valve got stuck closed due to carbon build up

Jun 01, 2013 | 1992 Pontiac Grand Am

1 Answer

Vr commodore backfiring


This may be due to a brunt valve or misadjusted valve, the back firing is due to the intake valve being open while its firing in that cylinder.
Make sure all wires to cylinders are correct and not crossed.

My first thing i would look at is the firing order, may be a crossed wire, even if it starts and runs you may still have a crossed wire, then if firing order is correct then i would move to checking the adustment on the valves for that cylinder,
Make sure rocker arms arm tightened correctly and push rods are in correct locations. i know that some engines like the 3.1 have diffrent size push rods for the exhaust and intake, remove the valve cover and see if that valve is closed, or try a compression test on that cylinder and if it is low then you have a bad valve or it is not adjusted correctly and last the timing chain is not aligned correctly.

May 18, 2012 | Holden Commodore Cars & Trucks

1 Answer

03 winstar won't start, shakes ,back fires, fires 3times dies.


More than one issue, maybe? Also consider other experts' solutions.

First, it sounds like the EGR valve is sticking open. The exhaust valve is supposed to be closed when idling, otherwise open. It recirculates exhaust back into the manifold; can't idle car very well when the valve is open, but should not cause backfire.

Backfire, is generally an ignition timing issue: the ECM (electronic control module) is responsible for that. Check it / replace it.

Worst case: small break in one of the head gaskets (not likely, but symptom is the same).

Vacuum leak, too???

Hope this gets you pointed in the right direction!

Sep 21, 2009 | 2003 Ford Windstar

1 Answer

Back fires through carbarator


i had that problem. the car would backfire and shut off. it turned out that one of the valves wouldnt close all the way, and it would backfire through the head. i dont know a lot about cars, but this was my problem. replaced one of the valves and it was fine.

Jun 23, 2008 | 1990 Oldsmobile Cutlass Calais

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