Question about 2000 Ford Mustang

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2000 Ford Mustang 3.8 engine. Code shows misfire on #5 spark plug. What do I need to check. Changed spark plugs, plug wires and coil pack and still not helping?

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  • Ford Master
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Check basic stuff. Compresson first. Compare #5 with the other cylinders. If it's lower, squirt some oil in and check again. If it comes up, rings. If it doesn't come up, valves or perhaps head gasket.

Posted on Apr 25, 2015

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2008 Cadillac CTS returning P0303 after replacing spark plug and coil pack


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Your first two codes could be caused by old spark plugs and/or leaking plug wires.

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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.

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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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