Question about 2002 Ford F150 Regular Cab

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2002 f150 with 5.4l washed engine now running rough

2002 f150 4x4 5.4l washed engine now running rough?

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The boot/pancake seal that covers the spark plug cavity gets old and lifts off of the surface of the head. This allows dust and water to invade the cavity that the spark plug is recessed into. Moisture in the engine compartment will often find its way into the spark plug cavity and short the spark to ground (misfire). Sometimes moisture will cause the COP (coil on plug) to also malfunction. If you have even one plug misfiring, it is wise to clean all the cavities and replace the spark plug boots. You will need an assortment of 1/4" wobble extensions, universal, and 7mm socket to remover the COPs. It can be done without removing the FI rails. #7 spark plug will prove to be the most difficult. You will also need to disconnect adjacent injector and COP electrical connectors (easily done). Do not despair. Visually inspect each cavity using mirrors and contortionist moves. If you see moisture and/or dirt in the cavity, you should clean it out. Get a spray bottle with rubbing alcohol and fill the cavity about half way. Let it soak a few minutes and blow it out with compressed air. Always use eye protection when using compressed air. Inspect for cleanliness and repeat as necessary. A word of advice, do not hesitate to use the aftermarket COPs. They work well and are cost far less than the Motorcraft brand.

Posted on Sep 17, 2009

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Water in spark plug holes in heads!!!!! Spark is jumping through coil plug boots. Remove coil pak and dry boots, blow compressed air to dry out spark plug holes. they go straight down from fue rail. Good luck with the passenger side by fire wall. its a tuffy

Posted on Jul 22, 2009

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Ihave the same problem but my battery light is on ,only at higher rpm any reason why??

Posted on Jun 16, 2013

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Posted on Jan 02, 2017

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