has anyone else encountered this and know the root cause? or can one of our GM tech guys see if they can pull anything up beyond this:

2006 Chevrolet Cobalt
Bulletin #: 3433
Sequence #: 10017032
Date: 01/01/1901
Component Name: 061000 engine and engine cooling:engine
Make: Chevrolet
Model: Cobalt
Year: 2006
Summary: Service engine soon (ses) light and severe engine misfire on cylinders 1 and 4 or cylinders 2 and 3. *tt


im fouling 1 and 4 consistently as soon as i start it up and i wanna know why before i put everythign back to stock and have it towed to the dealer

 

I get a pretty rough shutter at idle...

Taking it to the dealer for that among other things.

Keep us posted.

-Rich

 

i've noticed it kinda choppy at low rpms in 3rd etc and it has felt like there's been a slight loss of power but today i couldn't even get out of 2nd gear.

 

I get a rough idle... but havent gotten a misfire code yet... but of course my car is in the dealership still... so I'll see when I go there tonight

 

Document ID# 1715546
2006 Chevrolet Cobalt


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Subject: SES Light and Severe Engine Misfire on Cylinder 1 and 4 or Cylinders 2 and 3 Due to a Repeat Ignition Module Concern - keywords ICM miss no P0300 P0301 P0302 P0303 P0304 plug spark #PIP3433B - (10/20/2005)



Models: 2002-2005 Chevrolet Cavalier

2005-2006 Chevrolet Cobalt

2006 Chevrolet HHR

2004-2006 Chevrolet Malibu

2004-2005 Chevrolet Malibu Classic

2002-2004 Oldsmobile Alero

2002-2005 Pontiac Grand Am

2005-2006 Pontiac Pursuit (Canada Only)

2002-2005 Pontiac Sunfire

2003-2006 Saturn Ion

2004-2005 Saturn L Series

2002-2006 Saturn Vue

with 2.2L Engine (VIN D or F - RPO L61)




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The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this PI.

Condition/Concern:
Some customers may comment on a severe engine misfire and a SES Light. Upon inspection, DTCs P0300 - P0304 may be found due to misfires on cylinders 1 and 4 or cylinders 2 and 3.

Recommendation/Instructions:
If ICM (ignition control module) replacement temporarily corrected the above issue only to have the same concern return again, perform the SI diagnostics. If the SI diagnostics lead to ICM replacement again, something may have damaged the ICM causing the vehicle to return with the same concern again. If it appears that something has damaged the ICM, replace the ICM as directed by SI, ensure that the ICM ground is clean and tight, and replace all of the spark plugs to possibly prevent ICM damage again.

If the SI diagnostics do not isolate a cause for the above concern due to the intermittent nature, inspect circuits 406 (IC Control for 2/3 Coil) and 423 (IC Control for 1/4 Coil) for an intermittent short to ground. Depending on the model, this may occur on the AC lines near the AC compressor, on the transmission mount, or on the transmission lines where they enter the transmission. If no shorts are found, inspect the ignition control module ground to ensure that it is clean and tight.

Please follow this diagnostic or repair process thoroughly and complete each step. If the condition exhibited is resolved without completing every step, the remaining steps do not need to be performed.



GM bulletins are intended for use by professional technicians, NOT a "do-it-yourselfer". They are written to inform these technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions, and know-how to do a job properly and safely. If a condition is described, DO NOT assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See your GM dealer for information on whether your vehicle may benefit from the information.
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Document ID# 1715546
2006 Chevrolet Cobalt


Maybe this will help you.

 

that is exactly what i needed! thank you very much.

 

got the call at lunch, ICM went bad at 15000 miles. should be good to go by the end ot the day. I'm happy now.