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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Could be the injectors. You would need to figure out which cylinder is weak, and then why. Have you replaced the fuel filter in the past 12 months ?

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The reason for the problem can be faulty fuel injectors, clogged air filter, faulty ignition coil, and many more or none of these. These are just assumptions for the problem. The real problem may be something else, so I would suggest you to get your ride checked for the error code and then update your answer indicating error code.

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On your car the ECM is set up with two quad injector firing sequence. All even numbers and all odd numbers. It is rare that both would go out at the same time. The ECM grounds the injectors, so I would check for power going to the injectors first. This could be a fuse or a bad wire. One wire feeds power to the injectors until it reaches the engine. this is a start, so let me know. Randy

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I took my 2004 gmc envoy, 6 cylinder, in for new spark plugs and fuel filter. When i got it back the service engine light came on. I took it back and was told that it was a bad spark plug. I have taken...


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.

The 6th cylinder is only putting out 80lbs of pressure where as the rest were putting out 195lbs (factory says it should be around 215lbs). His recomendation was new motor or new vehicle.

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I recently had to have the transmission rebuilt. When the mechanic was finishing up he told me that it needed a TCM as well. After that it still ran rough, shaking and all. My check engine light has been...


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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2 Answers

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There is a little tester calles a NOID, it plugs into the harness connector to the fuel injector and flashes if there is a signal, they only cost a few dollars.

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