1989 Toyota Corolla Engine Backfire Upon shut off every so

Tiny
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.
Thursday, November 12th, 2009 AT 4:42 AM

2 Replies

Tiny
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
Tiny
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.
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Thursday, November 12th, 2009 AT 5:53 AM

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