Question about 2002 Ford Taurus

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2002 Ford Tarus intermittant missing cyl #3 after tuneup

First forgive me if this question appears twice but I don't know that it made it through the first time so I'm trying again by signing in first.

I have a 2002 Ford Tarus 3.0 24V DOHC engine. I had a tune up not too long ago and at that tune up replaced the plugs with motorcraft plugs and also replaced the plug wires with new ones. Not long after the #3 cylinder showed as missing (after a local auto shop read the codes (no numerical code given though). I can only suppose that it's the coil pack or the fuel injector but I am leaning toward trying the coil pack next. Can anyone recommend any troubleshooting test that might show which is the source of the problem? Any substitution procedure that would help in troubleshooting the problem of the #3 missing cylinder? Also if the Coil pack is to be replaced should it also be motorcraft part or does that matter as far as the coil pack is concerned?

Last note ( info ). The missing doesn't always happen but it's intermittent. Sometimes worse than other times and more noticeable at idle or low speeds but sometimes it doesn't happen at all.

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Just check the coil pack one at a time to know where if this is the issue.Injectors do tend to go. Unplug injector plugs one at a time and see if you can tell a difference.

Posted on Sep 11, 2009

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I would remove one plug at a time, plug it back in wire and lay on top of engine block. Have some one crank and look for spark. Do this for each plug. If 1 is missing. You have bad wire. If two sparks are missing, then you have bad coil pack, if 3 is missing, you have two bad packs or bad module, if all cylinders are missing, then module or cranks sensor is faulty. Dont forge to change those plug wires just as often as plugs. They may look good still, but they get weak

Posted on Sep 11, 2009


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