Question about 2008 Chevrolet Cobalt
Switch the suspected coil with another cylinder and retest. Clear the codes and test drive, if the cyl. misfire code changes to the new location, it's the coil, if it doesn't, it could be a fuel injector problem, low compression problem, vacuum leak, etc
Posted on Dec 12, 2014
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Posted on Jan 02, 2017
did you replace only one spark plug? that can cause issues because of differences in resistances between cylinders. also, did the map code stay off after replacing
Posted on Feb 28, 2010
SOURCE: i have a 2001 chevy
misfires can be caused by faulty ignition components, but they can also stem from other components. Such as faulty injectors, or improperly timed or unseated valves. Sounds like you have touched on all of your ignition suspects.
Are there any codes present other than P0304, P0305 and P0306? If so they should help guide you in the right direction. If not, You might want to make sure your valves are seating and if so, go ahead and swap an injector from a misfiring hole with a good one from a hole with no misfire. (like switch #2 and #4 injectors for example) if the misfire moves to cyl 2, you know the injector is at fault.
Posted on Oct 02, 2010
Sounds like HT Leads as you haven't mentioned them above? not being familiar with the car I would say distributer but by the sounds of it your leads go straight to the coils. Crank sensor might be playing up aswell.
Posted on Jan 08, 2012
Use some electrical spray cleaner or tuner cleaner and give mass air flow sensor a good cleaning. then try it. If that doesn't help, a fuel system pressure test may be smart to confirm proper pressure required is there. Low fuel pressure will cause multiple random misfire as well.
Posted on Feb 18, 2012
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