Questions & Answers for: GMC Sierra random cylinder misfire

Question about 1998 Sierra

1 Answer

random multipe misfire, and misfire on cylinder 4. ive changed the plugs and wires and cleared the codes and the same ones came back on. theres also a code that says the rpm's are higher than expected

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the spark plugs that are in the truck are good for at least 100K miles and if one was faulty it would set a code such as p0300 [ random misfiring ] up thru p0308 [ p0301 being cylinder #1 and so on ]

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...Random/Multiple Cylinder Misfire Detected have a good day !! If you're pulling a random misfire code, a common problem is the fuel pump. If you don't got enough fuel, its gonna misfire! If it was a ...

...cylinder specific misfire #2 , 4 it would be P0300 random misfire . I would think fuel injector's too . When hot they could be breaking down electrically , more resistance . If they tested ...

Question about 1998 Sierra

1 Answer

...is caused. any ideas? The P1345 means SGC (Cam Position) sensor circuit malfunction/crankshaft position-camshaft position correlationP0300 means random/multiple cylinder misfire detectedmpps ecu ...

Question about 1999 Sierra

1 Answer

...random misfire. It could be bad plugs, wires, coils, intake gaskets and a whole lot of other things. You need to have that diagnosed by a mechanic. The cause of my po300 code was a bad intake gasket ...

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