1999 Ford F-150 miss I can't find

OKBUILDER

MEMBER
1999 FORD F-150
V8
2WD
MANUAL
173,000 MILES

I changed spark plugs and now have a miss I can't find. I unplug each coil and it makes no noticable difference. OK thanks for the suggestions. I did go to two different shops, they can feel and hear the miss but no codes show up, one shop even had one of the really hi-tech computers, but it couldn't identify where the miss was. I've checked gap, checked for air leaks, there is no distributor. One shop told me it was because I wash my motor. Which doesn't make sence as I've washed it regularlly since new in 99. Next?

2 Replies

BLACKOP555

MECHANIC
10,371 POSTS

If I were you I would go to the closest mechanic or better yet auto value and have them test for trouble codes it will tell you if its a random missfire or what single cylinder it is on.

First check the gaps on the plugs and the wires.

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Thursday, December 20th, 2007 AT 6:39 PM

GOTIT

MEMBER
1 POST

[quote="blackop555"]if I were you I would go to the closest mechanic or better yet auto value and have them test for trouble codes it will tell you if its a random missfire or what single cylinder it is on. First check the gaps on the plugs and the wires.[/ I had a simalar problem, changed a few hundreds worth of parts and found out it was my distributor. It is not really that expensive. There is a small piece inside the distrbutor that loosens but still works at times. Hope this helps. Quote]

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Thursday, December 20th, 2007 AT 8:21 PM