Question about 2003 Ford Expedition
If i change the spark plugs on 2003 expedition should i also change the coil boots? What else is recommended?
Its recommended to replace all coils at the same time you replace the plugs. I had the same problem @62000miles, changed the same part, including injectors at the ford dealer. It just got worst, I replaced all the coils and engine ran like new.
Posted on Aug 13, 2009
You don't need to go so far as changing the coil boots when you change the spark plugs. I would recommend changing the plugs but also I would clean or replace the idle air control valve. This valve is located on the throttle body and is normally held on by a couple screws. You can clean this with throttle body cleaner. Just make sure that it is completely dry before you put it back on. You can use compressed air to do this. Once you do this and change the plugs you should be good to go. Let me know if this doesn't fix your running rough problem. Please let me know if you have any further questions. Thanks for using FixYa!
Posted on Aug 10, 2009
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Posted on Jan 02, 2017
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