2010 chevy cobalt cylinder 4 misfire at idle
New plugs, coils, unhook battery, still misfire when
engine warm at idle.
Plug clean showing that it is firing correctly.
Rotated coil, still cylinder 4 misfire.
Need to check the compression to see if it is low in cylinder #4
P0304 CHEVROLET - Cylinder 4 Misfire Detected... Possible causes Faulty spark plug 4 Clogged or faulty fuel injector 4 Faulty ignition coil 4 Fuel injector 4 harness is open or shorted Fuel injector 4 circuit poor electrical connection Ignition coil 4 harness is open or shorted Ignition coil 4 circuit poor electrical connection Insufficient cylinder 4 compression Incorrect fuel pressure Intake air leak.
Good luck with this! A friend at work had an '05 Cobalt that kept throwing a cylinder #3 misfire code. After taking it to the Chevy Dealer and a few private garages nobody could fix it. When the car was coming due for inspection he traded it in! You might try reflashing the PCM with updated software. HTH. -Jim
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