1989 Toyota Corolla Engine Backfire Upon shut off every so

ICOFM

MEMBER
1989 TOYOTA COROLLA
4 CYL
FWD
MANUAL
147,000 MILES

Every so often upon turning my engine off, backfire occurs within the Area of the Carburetor. Air intake, and intake manifold. I regularly use carbon cleaner and stay on top of maintenance. I just replaced my distributor, all wires, rotor, fuel filter, oxygen sensor, spark plugs and a new battery. The car starts up quick but does idle at a high rpm upon start up and rpms slowly rise. If I do not give it a rev, it will continue to increase and continue at a high rpm for a short while till the engine warms, then it will drop to normal idle.

I know components to consider which could be causing these issues: MAF, AIC, Fuel Pump, Intake manifold, Air intake Manifold, Vacuum leaks, Fuel Filter. However, I would like someone to try to narrow it down to the one thing responsible, if they can.

Your feedback will be greatly appreciated,
Thank you.

2 Replies

MMPRINCE4000

MECHANIC
8,548 POSTS

I would look at the IAC, Vacuum leak and linkage to carb for binding. I would rebuild the carb and check for any vacuum leaks.

On a 20 year old carb, it probably needs a rebuild kit.

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Thursday, November 12th, 2009 AT 5:30 AM

ICOFM

MEMBER
9 POSTS

I appreciate the quick response. To be a little for descriptive of the backfiring I will add that it sputters/vibrates moderatly for a couple seconds and stops abruptly. Other than that I really don't know what to add. As for the high Rpm idling upon start up, it tends to do this more often during colder weather.

I'll check those components mentioned. I actually was leaning toward the IAC, but wasn't sure.

Thank you.