Chen engine light on PO300 - PO306 cylinders misfire
What is your question?
So it shows that all cylinders are misfire but the car runs good.. so i have talked to couple mechanics and they have told me it cant be be a misfire because it should show me which cylinder exactly is the one is misfire.. so what can it be.. check engine light on with PO300 to PO306
What makes this problem better or worse?
When i turn on the car and sit there for a bit it shakes alittle..
How long has your 2008 Cadillac CTS had this problem?
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Hello, it sure could be all cylinders are misfiring.
Have all spark plugs and ignition coils been replaced?
Has base engine compression testing - including leak down test if needed - been performed? What are the results?
When the spark plugs were removed, what was their condition?
If codes are cleared and all 6 cylinders show misfire again, do what I suggested (if it hasn't been done already) and recheck. Ensure you use GM components to ensure good quality.
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