Question about 1992 Pontiac Firebird

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Have had a rough idle for 2 years--1992 firebird--2 places told me it was the fuel injectors--needed new ones--I took it back to a mechanic who is an mechanical engineer--he said he was sure it was a valve problem and gave me the option of changing or not changing the injectors-he found an oil leak and did a total valve job and other maintenance things--drove it over 800 miles--still drives great on the highway but does not idle smoothly --I am guessing that the injectors are still causing that problem???

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Could be your ignition control module it handles your gas and air mixture

Posted on Jan 07, 2013

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I would check all those pesky little rubber vacuum hoses that are used for pollution control. They tend to go hard and split if they are over 10 years old, allowing air /vacuum leaks into the inlet manifold which upsets the idle mixture causing rough idling.

Posted on Aug 20, 2010


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I was having a similar problem with my 2002 Envoy. Usually when accelerating at 60 and 90km/h it would have almost like a clunk and idled rough.

I took it into the shop and they said a tune up would be the first step to correct the misfire (25 options to choose from!) After pulling the spark plugs the 5th and 6th didn't look right. As a result my mechanic ran a compression test.

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A 2002 is not an "older car".
You should easily be able to get 15 years out of any decent car.

But the PCM and TCM are not likely bad.

First start with a simple tuneup, with plugs, wires, etc.
Then you try diagnostics on the fuel injection, such as temp, O2, and air mass sensors, as well as filter, fuel pressure, etc.
Then check things like ERG valve, fuel vapor purge valve, etc.

The last thing you do is give up and buy new control modules.

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rough idle loss of power is usually related to needing a tunup or clogged fuel injectors. You could try having a shop do an injection service or go to autozone or chevron and get some techron fuel system treatment and add 1 bottle to half a tank, then add 1 bottle to a full tank and hope for the best.. I doubt its a timing chain problem. If it were a timing chainn problem the problem would would most likely of happened all of a sudden. A bad tank of gas could of also cause this. Also the 02 sensor should be changed at around 70,000 miles or so, especially if your getting bad fuel milage. This wont fix the rough idle if the injectors are clogged.

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