99 F150 5.4 stalling/missing
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Junior User
Joined: Jan 2004
Posts: 87
Likes: 3
From: MN
99 F150 5.4 stalling/missing
Hey guys,
I have a wierd probem. First started with a miss after a good rain. SES light came on. Read a cyl #5 misfire. I replaced the COP and plug. Cleared the code. Still misses and now on top of missing, it quits when I shift into gear or stopped. I have to feather the throttle to get it to run again. No new codes. Should I replace all the plugs and the IAC valve? Oh the truck has 135,000 miles and the plugs were replaced around 90,000. Thanks!
I have a wierd probem. First started with a miss after a good rain. SES light came on. Read a cyl #5 misfire. I replaced the COP and plug. Cleared the code. Still misses and now on top of missing, it quits when I shift into gear or stopped. I have to feather the throttle to get it to run again. No new codes. Should I replace all the plugs and the IAC valve? Oh the truck has 135,000 miles and the plugs were replaced around 90,000. Thanks!
Senior User
Joined: Mar 2003
Posts: 397
Likes: 0
From: nova scotia, canada
un plug the iac connector. it will set a code but the engine will run at a default setting. try that. as well it seems that the first cop code usually isnt the only one giving the problem. try a new cop one cyl 1, no change re-install originol cop and move to cyl 3, then 5, etc. if you dont find a bad cop then you will have a spare and you will know that all yours are good. i know it doesn't sound right to do this but it can work and its still cheaper than a garage throwing parts at the truck that it may not need.
Elder User
Joined: May 2004
Posts: 644
Likes: 0
From: GARLAND, TX
how long should it take for it to throw back the service engine soon code into dash? because i cleared my code took half day for it to come back...imagine changing each coil and waiting for freaking code after clearing to come back....wut u guys think?
Senior User
Joined: Mar 2003
Posts: 397
Likes: 0
From: nova scotia, canada
ya it can take a while. but don't wait for the code to come up drive truck and see if there is a difference.
fordguy4life- how did you get to number three? did it through a code or did you try and replace them. its great either way that you found it.
fordguy4life- how did you get to number three? did it through a code or did you try and replace them. its great either way that you found it.
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Junior User
Joined: Jan 2004
Posts: 87
Likes: 3
From: MN
Process of eliminatioin, really....Thanks for the help! I'm really starting to dislike the 'COP' design, though. Soon I'll have all new COPs. Think I only have 3 originals left. Wish I had a spare $500...I would have replaced them all at once.
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