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

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

Question type: Maintenance & Repair

4 Answers

6,945

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 of 3 people found this helpful.
35,555

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.

Will a misfire show up on the code generator?

35,555

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

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