Question about 2006 Chevrolet Cobalt

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2006 cobalt with the 2.2 will bearly start rough idle then smooths out at about 1k rpm motor has no power and will not rev, engine light came on says random miss fire, did tune up air filter and fuel filter, no change

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Spark plugs changed too? next guess is MAF (mass air flow sensor.

Posted on Sep 01, 2010

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Posted on Jan 02, 2017

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Have you cleaned the throttle body and throttle body valve? have you cleaned the idle speed control air bypass valve? are the injectors clean? Are there any fault codes in memory, do the things I mentioned if you haven't already. Also hard engine mounts can cause roughness at idle. Another thing is the timing belt tight?

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Rough idle, flashing CEL, low power would indicate a faulty ignition coil. A armchair diagnosis would be to replace the ignition coil. You'll have to swap the the contact stems (rubber conductors between the coils and the spark plugs) and the igniter module.

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Erratic idling revs up and down, check engine light on, o/d off dash light is flashing


There is a small electric motor call IDLE AIR CONTROL (IAC).

It add rpm when there is load like headlight,radio,power window while you at idle.

Just to bump up the power a little to keep everything operate smoothly.

When IAC is not functioning it will give you uneven idle.

Get the OBD-II code and repost. It will help you to get to the real problem.

OBD-II connector is 18" from the center of the lower dashboard. Scanner is about $50 to start.


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