2003 pontiac bonniville has misfir on cycl 2 and poor gase mileage


Asked by punkinwv1 Jan 26, 2013 at 11:00 AM about the 2003 Pontiac Bonneville SLE

Question type: Maintenance & Repair

4 Answers


When was the last time you had a tune-up? Could be a bad spark plug, faulty injector, or a problem wit one of your ignition coils. It is never a good idea to run a car while it is misfiring. It will cause damage to your exhaust system.

3 out of 3 people think this is helpful.
John Saffrahn

100% correct, that is why the check engine light is flashing. The only thing not mentioned was low compression on that cylinder. As soon as the misfire is fixed the MPG will go back up.

Mike Darbro

Will a misfire show up on the code generator?

John Saffrahn

yes as long as it has an On Board Diagnostic system.

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