Question about 2003 Ford Focus
I have a cylinder misfire and when i opened the hood while the car was running i noticed the exhaust manifold and sprk plug wire for cylinder producing spark. what would cause that
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Posted on Jan 02, 2017
SOURCE: 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.
Posted on Dec 31, 2008
did you check the injector pulse on that cylinder and it also could be the pcm , i had a taurus and a sable with good coils stop firing 2 cylinders and it was the pcm ,the code it gave was secondary coil but changed the pcm and it worked fine
Posted on Aug 29, 2009
SOURCE: p0303 cylinder three misfire
Running out of gas causes the scum in the bottom of your gas tank to be fed to you engine. I replace the fuel filter every 30000 miles.You might have allowed scum into one of you injectors. Try replaceing that spark plug first.Dont run out of gas.
Posted on Sep 02, 2009
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