Engine has a miss

Asked by Jan 28, 2017 at 12:44 PM about the 2006 Ford F-150 XL SuperCab

Question type: Maintenance & Repair

My 2006 F 150 4.6.Has a miss that
recurs,first dealer said it was
injector which he replaced
$$$.Then after a short period of
time it stared again.Took it to a
reputable shop and they said it was
the ecm..Replaced $$$.About 1
month later same miss came
back.Took it back and he said was
a coil on #1.Replaced $$$.Now
three weeks later miss is back...Any  
Ideas.Losing confidence in dealer
and shop.

3 Answers

19,745

90% of the tune a misfire on these engines is coil/plug related. I can't belive anyone would jump to injector or pcm first before even doing the coil. Is it the same cylinder misfiring or a different one? These tend to start to fail one after the other until all 8 have been swapped

2 of 2 people found this helpful.
71,615

Exactly as Andrew said. If one coil or coil pack (whichever the case) has failed it's best to replace all of them. When one fails the others are soon to follow. HTH. -Jim

2 of 2 people found this helpful.
815

isolate the miss fire to the cylinder. then figure out if it misses at idle or under load. small vacuum leaks in the manifold can cause misfire at idle but not usually above idle. it may be as simple as incorrect gap in the plug. or valve sticking open causing low compression misfire.

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