Wont start

Asked by Guru8F57J Jan 08, 2020 at 11:01 AM about the 2005 Chevrolet Cobalt

Question type: Maintenance & Repair

I have a 2005 chevy cobalt it wont start ive
changed the fule filter, fule pump relay, fule
injectors, spark plugs, ignition control
module and the o2 sensor. Hooked it up to a
diagnostics reader and all it said was that 4
cylinder is misfiring

7 Answers


Is the fuel pump operating? Do you have fuel pressure?


Likely a sensor or a bad electrical connection somewhere but that's just a guess at this point. Before spending more money on random parts and hoping for a miracle I'd spend a few dollars on some professional diagnostics.

I had my mechanic friend do diagnostics test on it and he looked at it and said its the coil pack


That sounds promising. Did he scold you for changing all those parts without finding the problem first?

No everything did need to be changed but the ignition control module


Oh good. I hate seeing people pour hundreds of dollars into an old car "searching" for a fix to a problem before they get around to actually doing some diagnostics. Hopefully you'll be up and running soon.

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