still sputtering and missing???
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Senior User
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From: Mesa Az
still sputtering and missing???
My 2000 V10 Excursion with 150k miles has been running rough on idle and under acceleration occasionally and it is getting worse. I cleaned the MAF sensor, and replaced the fuel filter, and it did not help. So I bought a new set of COP`s off ebay and replaced all 10 with the new COP`s and new plugs. It is getting worse and no check engine light has come on. Anyone have any idea what could be the problem?
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Senior User
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From: Mesa Az
It started out running rough when cold and then cleared up like you said, but now it runs rough at start up and all the time...sounds like its not firing on all 10. I don`t know if the fuel pressure in the rails is good...any idea how can I test for that?
Cargo Master
Joined: Jul 2009
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From: Chino, California
typically, if it's rough when cold, but clears up when warm, it's the IAC valve.
When you changed your COPs, did you replace the boots as well? Sometimes old boots could have cracks that can cause a short if water gets into the spark plug hole.
There is a Schraeder (spelling) valve on the rail on the passenger side. You can hook up a gauge to that. Someone can chime in on what pressure you should have.
When you changed your COPs, did you replace the boots as well? Sometimes old boots could have cracks that can cause a short if water gets into the spark plug hole.
There is a Schraeder (spelling) valve on the rail on the passenger side. You can hook up a gauge to that. Someone can chime in on what pressure you should have.
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From: Mesa Az
I also pulled and cleaned the IAC before doing the plugs and COP`s...there was not much carbon build up on it. It ran the same after I cleaned it.
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Cargo Master
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Maybe the motor is out?
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Senior User
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From: Mesa Az
The new COP`s that I installed came with new boots and there was no moisture. I will hook up a gauge tomorrow when I get home from work and let you guys know what pressure it has. Thanks for the help!
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