Screwdriver Electronic
1988 Grand Am, 2.0L, Rough Idle?
1988 Grand Am, 2.0L Turbo. 123K miles.
All of the sudden it started to idle really rough like its running on 3 cylinders. And it sounds really bad through the exhaust.
And its not all the time.
I can start it up in the morning, and it runs fine, I drive it for 30 minutes at highway speeds 60-65 mph, and come to a stop light, and its idling rough. Light turns green, I go a few blocks, and its fine.
Somedays it may only do it once or twice, others not at all.
Sometimes I start it up and it runs rough, and after the highway driving its fine.
New fuel pump, fuel filter, plugs, and wires in the last 8 months.
PCV looks good, and rattles when shaken.
Fuel injectors sound OK (the old trick of using a long handled screwdriver, and I can hear them clicking).
Could it be something electronic with the computer module?
A plugged catalytic convertor?
EGR valve?
I running out of ideas, and any help would be greatly appreciated.
Thanks
your right, it sounds just like a EGR valve as it opens at highway speed, it could be staying open at idle or crusing speed due to too much air flow, leaning out the mixture. or it could just be stickey and slow to close, or even shorted if its inconsistant.
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