The catalytic converter could be the cause of the rough idle if is becoming clogged. P0420 code is basically just replace the converter, which you are already doing. I would wait till after the cat is put in and then see how it runs and go from there.
Engine runs rough, in gear, at stop
I have a 1997 Malibu with a 3.1L engine. I just replaced the intake manifold gasket, and now after the engine heats up, it will idle rough while the car is in drive at a stop light or sign. If I slip the transmission into neutral, it runs just fine. There is only one code, but it's for the catalytic converter, which is scheduled to be replaced within a week. It almost feels like there's a detonation when I'm idling at a stop. Any suggestions?
I work for a gas station with an attached garage, and they could only suggest that the torque converter clutch or associated solenoid could be the issue.
Thanks
I work for a gas station with an attached garage, and they could only suggest that the torque converter clutch or associated solenoid could be the issue.
Thanks
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It would normally run bad throughout, but always expect the unexpected. It was just a suggestion to fix one thing before trying to diagnose another.
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