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Trouble code P0300 means: Random/multiple cylinder misfire detected
2006 Pontiac grand prix recurring number 4 cylinder misfire diagnostic code? What could it be?
Most commonly a bad plug or wire. If not that, then coil.
P0300 = random misfire. Could be as simple as needing a tune up.
Bad plug? Bad wire? Bad piston or valve (do a compression test)
What is happening there is that the computer may not be able to detect the misfire in the electrical system, but is finding too much raw fuel downstream in the catalytic converters that tells it that the fuel is not burning completely, thus a misfire. Could indicate that the problem is mechanical not electrical.
p0303 is cylinder #3 misfire
Cylinder #1 misfire.
Cylinder number four misfire.
misfire cylinder #5
Cylinder 1 Misfire Detected
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