Miss fire cyl 6

Asked by Feb 25, 2017 at 09:02 PM about the 1998 Pontiac Grand Prix 4 Dr GTP Supercharged Sedan

Question type: Maintenance & Repair

So I bought this car it seemed fine I took off the
exhaust being the resonator and since then I've
noticed it missfiring on cyl 6 I've replaced the spark
plug and have ran injector cleaner through the gas
tank what could be causing this issue?

1 Answer


Resonator, is that the catalytic converter? One would need to be on there for the engine to run right...P0306 PONTIAC - Cylinder 6 Misfire Detected...Possible causes; Faulty spark plug 6, Clogged or faulty fuel injector 6, Faulty ignition coil 6, Fuel injector 6 harness is open or shorted, Fuel injector 6 circuit poor electrical connection, Ignition coil 6 harness is open or shorted, Ignition coil 6 circuit poor electrical connection, Insufficient cylinder 6 compression, Incorrect fuel pressure, Intake air leak...The P0306 code means that the cylinder 6 is misfiring or is randomly misfiring. Start by checking for intake leaks an if no leaks are found the next step is to replace the spark plugs on cylinder 6. If the problem persist more tests needs to be done to diagnose problem.

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