bcm
Asked by Sharan_834 Jan 14, 2017 at 06:01 PM about the 2010 Chevrolet Cobalt
Question type: Maintenance & Repair
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.
2 Answers
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.