My 2007 Ford Expediation was missing intermittenly. I changed the plugs and now it runs worse then ever. Any ideas???

Asked by Mar 12, 2012 at 07:46 PM about the 2007 Ford Expedition XLT

Question type: Maintenance & Repair

I took it to Auto Zone and they used their machine to check and said that cylinder #4 was misfiring.  Then they said it had multiple misfires.  I even changed the coil on top of cylinder #4 and #1 which did no good.

3 Answers

915

There are a few things that could be the problem. The COP on these engines have always been a problem on the Pre 2005 engines. You couldhave gotten a bad coil. It does happen. I would have allthe coils tested for resistance. I would have all the boots visually looked at for damage. I would also replace all the plugs, and do a thurough tune up. I would also check the injectors. You could have one that is not fully opening or has been gummed up. You might want to go out and buy a coupe of cans of injector cleaner for the next 2 fill ups. You may need to replace and injector if it is acting up.

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15

Take to Auto Zone or Advanced Auto Parts ask them to check it out with their reader. It should tell you which Coil Pack is bad. Could be a plug wire.

1 out of 1 people think this is helpful.
20

I have this EXACT problem right now!! Have you rectified it?? What have you found to be the problem??

2 out of 2 people think this is helpful.

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