Engine missing on acceleration
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Elder User
Joined: Aug 2004
Posts: 551
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Engine missing on acceleration
My 98 Exp 5.4L 4x4 with 110k miles misses on hard acceleration. New plugs & air, pvc, and fuel filter were installed within the last 30k miles. No fault code is being displayed and when scanning while driving, no pending code is captured. Any suggestions?
Thanks,
Stephen
Thanks,
Stephen
Freshman User
Joined: Feb 2004
Posts: 40
Likes: 0
From: Vancouver Wa
sounds like a (COP) coil over plug problem . I had the same and also had no code. I found a bad COP with a torn boot. Also only use autolite single platinum tiped plugs. AP103 Other brands don't seem to work as well.
Elder User
Joined: Mar 2003
Posts: 689
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From: VA
Dang, I didn't realize how enthusiastic you guys are. Buying your own code readers, and all. 
I've been using as many Ford parts as I can, and mine is done well at almost 130K miles.
I've been using as many Ford parts as I can, and mine is done well at almost 130K miles.
Last edited by 2000Expy; Dec 17, 2006 at 09:00 AM.
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Elder User
Joined: Aug 2004
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I figured the money for the code reader is a worth while investment. I plan on keeping the expy well pass the point where I'm too feeble to drive. But, I have to drop another $60 to download the full scan program. With 112,000 on the beast, it probably wouldn't hurt just to replace all the cops. I've got a cross country road trip in a week and I don't want to take any chances. If I go the replace all cops route, I will definately buy them from the dealer.
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Laughing Gas
Joined: Jun 2003
Posts: 1,166
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From: Chino, California
I am putting my money on the COP's. It has happened to me exactly the same way a few times! 5.4 and 6.8.
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Hotshot
Joined: Aug 2002
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From: BC, Canada
For the price of a COP or 2 I'd take the truck to your dealer and have them run a cylinder power balance test on it. That can be done on the road while it's missing. Usually the cylinder(s) with the problem shows up easily.
I just can't see replacing all the COPs when only 1 has a problem.
I just can't see replacing all the COPs when only 1 has a problem.
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Elder User
Joined: Aug 2004
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Racerguy you're right. I would much rather know which cop is bad then have to replace all of them. But, I'm taking this baby cross country next week and would rather shall out the bucks to buy me peace of mind.
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