Question about 1997 Pontiac Sunfire

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What does it mean when cylinder one is misfiring i changed the plugs and it didnt work

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You probably need to change the spark plug wire on that cylinder at least; but I would change them all.

Posted on Nov 12, 2009

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2002 ford windstar showing obd2 codes po303,po304,po305 and idiling ruff and wont run over 45 mph and has low miles, how do i fix it ,thanks sincerely mark


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Engine misfires


You didnt mention having changed the spark plug wires, so that is another item that could be culprit as well. As well, it could be a coil pack that is not working properly.

I cannot recall at the moment if that model year uses coil on plugs or if it uses coil packs. Either way, if it uses a coil on plug set up, take the one for the #3 cylinder and move it to say #4 or anyone of your choice and see if the misfire follows

If it uses coil packs, there is likely one coil pack that controls two cylinders. In that case just swap the coil pack with an adjacent one and see if the problem follows. Pay attention to where the spark plug wires go because it will be an issue if you get them mixed up. You just swap the coil packs around.

I would, however, start with the spark plug wires if you have not changed them already.

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2 Answers

Code #12,43,43,43,72,55


code #43 is for a cylinder misfire, since there are 3 codes, this would mean there are misfires on 3 of the cylinders.
code #12 means the battery has been disconnected within the last 50 key cycles (nothing to worry about unless you didnt disconnect the battery)
code #55 is just a code to let you know it has reached the end of the list
code #72 means the catalytic converter efficiency is low.

knowing the P-code would help alot more.

there are a few ways you can start to diagnose this problem, change the spark plugs, wires, and coil pack. if it isnt this, then you can go more dramatic and change the catalytic converter because it might be clogged and therfor causing the misfire

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