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
221,495

Rowefast answered 7 years ago

Need to check the compression to see if it is low in cylinder #4

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221,495

Rowefast answered 7 years ago

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.

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