06 Chevy Cobalt Missfire/Rough idle

Asked by Jul 29, 2013 at 12:44 PM about the 2006 Chevrolet Cobalt LS Sedan FWD

Question type: Maintenance & Repair

I Habe A 06 Cobalt, Check Engine Light Is
On. It Has A Very Rough Idle Amd Smoke Is
Coming Out Of Exhaust.. Doesnt Smell Like
Fuel.. I Habe Replaced Spark Plugs, Coil
Pack, Icm, Amd.fuel Filter, Anybody Have
Anyclue On What To.Do Next?? Im Going
Broke On Cash And Patience.. Maybe Even
A Misfire.. Im Lost At This point

7 Answers


What color smoke?

2 of 2 people found this helpful.

White/Gray.. Its Not A Real.Thick Smoke But It Shouldnt Be Doing That.. Car Only Has 45 Thousand Miles On it

ItsLooks LikeWhen You Druve A Car In The Winter Without Letting ItWarm Up All The way


White smoke is water. Could just be condensation in the exhaust. Could also be a blown head gasket (which would explain the smoke and the rough idle. Are you losing any coolant?

1 of 1 people found this helpful.

Not Losing Any Fluid And Has Never Gotten Hot..??


Then it is probably just condensation in the exhaust. Have you run a compression check on the cylinders? Fuel pressure check at the rail? Are you getting a check engine light?

3 of 3 people found this helpful.

I am not sure but i might have had the same problem with my 2009 cobalt.i changed the camshaft actuator solenoid you have 2 of then on top of block under the cover. 1 is for exhaust 2 is for the intake mime was the intake side car runs like new now and no problems even after 11,000 miles. The parts run around 50 to 60 $

2 of 2 people found this helpful.

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