RPM needle moves up and down while I'm stopped at a red light.

Asked by kilrush Aug 18, 2014 at 04:44 PM about the 2008 Chevrolet Cobalt

Question type: General

Why does my 2008 Cobalt RPM needle move up to 20 then 30 and back down.  This happened while I was stopped at a red light with my foot on the brake.  After the light turned green, the car felt jerky as I went to drive.

1 Answer
51,245

John answered 10 years ago

Does your engine also race up and down? If so, it is not the tachometer. Are you getting any check engine lights? You may have a sensor going out, either in the air sensor or smog sensing units giving false readings to your computer. Have a shop hook you up to a computer reading machine and see what they pick up.

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