Question about 1998 GMC Jimmy

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Back fire backfire

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The fuel pump or the sparkplugs or both,check it out.
or
Could be in need of a tune up... carb and timming adjustment. New plugs,wires,rotor, dist cap.Tune ups are needed on a regular basis ussualy once a year depending on the amount of miles you put on the car? The charging system sounds o.k but tune up may be in order
or
Timing is way off specs, or plug wires hooked up incorrectly. I would suspect the latter.
Firing order 1-3-7-2-6-5-4-8
or also
if vacuum leak

Posted on Nov 19, 2008

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Lost power then came to stop then backfired.restarts for only few seconds then backfires at intake


Did you change the distributor? Could have put it back in the wrong direction or forward too much on the timing notch or put too plug wires on the wrong post..... It definitely sounds like a timing issue and the back fire sounds like the plug is firing the cylinder on the intake stroke.... if you keep at it you will blow your muffler off or start a fire. Look up the firing sequence for your year and make of car to be sure

Apr 27, 2015 | Cars & Trucks

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Backfire


one of the cylinders is missing. It doesn't fire sometimes and when it does, you get the backfire. Check the plugs. It should be obvious which cylinder is at fault.

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4 brl rochester carb


Backfiring is caused by either the firing order being incorrect or the engine timing is incorrect. generally backfiring through the carburetor is caused by incorrect firing order. confirm the distributor is inserted properly and double check firing order beginning with cylinder number 1.

Mar 22, 2014 | 1984 Buick Regal

1 Answer

Cranks backfires


That could be a timing issues when it back fires
Why ,no idea,not a question you can guess at as we do here
Could also be a vacuum leak & lean fuel mix
When you say cranks the motor turns over nothing else
Cranking has nothing to do with the motor starting or running
You have a no start & back fire as I gather

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what year ?
backfires from an EFI engine are not good signs (ussually means timming issue).
Carburated engines on the other hand are more likely to backfire when left sitting for long preiods.

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1 Answer

WONT START AND TRIES TO TURN OVER BUT BACK FIRES


AWESOME a real camaro problem.
backfire.
strong odor of gas because the gas isn't getting burned
caused from backfire. backfiring because the spark isnt sparking when its supposed to.
problems could be bad spark plug wires , bad plugs , bad ignition parts.
your gonna need to check wires for bad spots, check ignition coils and stuff like that. if all that stuff is ok, then your problems have to do with inside the engine. jumped time etc.

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1 Answer

Van backfiring when driving at low speed


For the 3.3L:
Firing Order:

1-2-3-4-5-6
Cylinders:
(back of vehicle)
1--------3--------5
2--------4--------6
(front of vehicle)
Ignition Coil:
(back)
6---3
4---1
2---5

Let me know if this helped, or if you have additional information or questions. Feel free to contact me at FixYa.com!

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1 Answer

I have a 2001 that backfires


YEP A CRACKED DISTRIBUTOR CAP.CAUSE BACK FIRING AND CROSS FIRING PLUG WIRES.BAD PLUG WIRES WILL CAUSE BACKFIRING.WRONG HEAT RANGE PLUGS WILL ALSO CAUSE BACK FIRING.

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1 Answer

SAbre ridingb mower. Runs, backfires,almot die, still run. Backfire again,then dies and can not restart. PLEASE HELLP!!!!! PHIL Mpwer M#1438 Engime B&S M#287707 14.5hp, OHV


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