2006 f-150 miss
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Junior Member
Joined: Nov 2012
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2006 f-150 miss
I have 2006 f-150 5.4. check engine light came on after noticeable miss. Code said #1 and #8 misfire, and multi-misfire. Changed coil packs and plugs on both cylinders, still has terrible miss but no check engine light. Any suggestions?
Senior Member
Joined: Jun 2010
Posts: 16,567
More than once bad plugs and coils have taken a good tech for a ride because he assumed they were either replaced a short while ago or "seemed" to look OK.
Those 5.4s don't like other than Motorcraft plugs and the coils have been quite troublesome. If the coils have never been changed I would consider replacing them because if they produce a good voltage spike in the system they can destroy the PCM and it's cheaper to replace the coils than the PCM. I know OEM parts sometimes cost more than some aftermarket ones , but they do solve the problem. Also check the plugs where they connect to the PCM because moisture intrusion there can produce some results similar to what you are seeing.
Those 5.4s don't like other than Motorcraft plugs and the coils have been quite troublesome. If the coils have never been changed I would consider replacing them because if they produce a good voltage spike in the system they can destroy the PCM and it's cheaper to replace the coils than the PCM. I know OEM parts sometimes cost more than some aftermarket ones , but they do solve the problem. Also check the plugs where they connect to the PCM because moisture intrusion there can produce some results similar to what you are seeing.
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