We've replaced fuel pump fuel rails spark plugs wires coil packs fuel filter censors etc etcetc
SOURCE: 2000 Pontiac Grand AM trouble code P0300
Im surprised that didn't fix it. On the Quad4 engine its usually a cracked coil housing.
Have you checked:
The crankshaft position system variation compensating values are stored in the PCM non-volatile memory after a learn procedure has been performed. If the actual crankshaft position system variation is not within the crankshaft position system variation compensating values stored in the PCM, DTC P0300 may set.
SOURCE: no spark from the coil packs
Check the wiring and make sure your getting 12V to the module (under the coil packs) when the ignition key is turned on. If you have 12V then ohmmeter the coils. The primary side is like .5-1.5 ohms and the secondaries are in the 7500 ohm neighborhood. If all this checks out OK the module would be the culprit.
SOURCE: 1994 pontiac transport se not firing in first coil pack at idle
ARE YOU CHEKING SPARK OFF THE COIL TOWER OR AT THE SPARK PLUG END OF THE WIRE SOUNDS LIKE YO HAVE A BAD WIRE
SOURCE: 1992 Pontiac Grand PrixPower loss,erratic idle
spark plug gaps are very critical on computerised cars!! [some wont even start!]
distributor module may be breeaking down as temp rises they fail!
otherwise do compression check as it may have valve problems
also check plug leads & injectors aswell as the fuel pump pressure [ could bestarving for fuel]
SOURCE: 1991 Pontiac Sunbird SE sometimes stall after starting
2 possable... bad fuel injector....or leaky intake gasket worst case the intake manafold is craced
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