Question about 1998 Pontiac Grand Prix

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Has a mis changed plugs and wire scan tool says mutiple cylinder mis fire

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  • Pontiac Master
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Most likely the fuel injectors need cleaning,try lucas fuel treatment.

Posted on Jan 30, 2010

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6ya6ya
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Posted on Jan 02, 2017

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1 Answer

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Replace the spark plug and if the problem still exsist replace the the ignition wire to the #4 cylinder.

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The DTC (Data Trouble Code) P0305 is the generic OBD-II DTC for "Cylinder 5 Mis-fire Detected", and it means that the OBD-II control unit has detected a problem with the #5 cylinder.

The problem could be a faulty spark plug, or a spark plug wire for the #5 cylinder, or the coil for that cylinder could be faulty (2.7 liter), or the distributor or distributor cap could be faulty (3.0 liter), or the fuel injector for the #5 cylinder could be faulty.

Before you look for any electrical problems causing the mis-fire on the #5 cylinder, first do a compression check to be certain that the mis-fire is not caused by a mechanical problem.

Here are the firing order diagrams for the 2.7 and the 3.0 liter enginesto help assist you.


2.7 liter

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3.0 liter

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ck if you have spark at the coil for that cylinder. check the plug wire closely. if it has spark at the coil, then replace all the spark plug wires.

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IS THIS A 99 CROWN VIC? IF SO IS IT MISFIRING? IF THIS IS THE CASE YOU MORE THAN LICKLY NEED PLUG WIRES.

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