P0300 PONTIAC -

Question

New coils, new spark plugs, new ICM, still getting code P0300. No power. What do I check next?

Answer 1

Hi there,

I would check for a plugged catalytic converter. If it's blowing exhaust back into the engine then you will get the P0300 code. Depending on how long the car ran with the misfire codes originally it may have damaged the converter.