Anyway to test COP's
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Senior User
Joined: Oct 2006
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From: Corn country
Anyway to test COP's
Truck never has a check engine light, but once in awhile i start it and it shutteres/chugs, rungs like total dukey, then once the truck gets good and hot it'll sort itself out and run smooth as ever. It's been doing this for awhile now, you never know when it's gonna happen, so it's tough since i dont carry a diagnositci tool to plug in and check for misfires, and I've had it scanned twice by a shop and there's no codes/hints in memory as to what's going ont.
I have a new fuel filter, new plugs/boots/springs installed last month or so, none of these made any difference. At $58/ea I'm not about to buy 10 and replace them hoping that solves this problem, so it'd be nice if there was a way to check the coils out with a multi meter or something to find a faulty, or on the way out coil pack.
thanks in advance for any help
Josh
I have a new fuel filter, new plugs/boots/springs installed last month or so, none of these made any difference. At $58/ea I'm not about to buy 10 and replace them hoping that solves this problem, so it'd be nice if there was a way to check the coils out with a multi meter or something to find a faulty, or on the way out coil pack.
thanks in advance for any help
Josh
Cargo Master
Joined: Dec 2004
Posts: 2,852
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From: Living under the bosses d
HHHHMMMMMM, Sounds like as it gets hotter it runs better? I would look around the intake Gaskets.... You may have a loose bolt or cracked gasket. As it gets hot the gasket seals itself... Also may verify this by spraying starter fluid or unlit propane around the gasket area when you first start it. If you have an RPM raise it is most likely the problem.
Post Fiend
Joined: Jan 2002
Posts: 5,859
Likes: 7
From: USA
Clean the maf sensor and the IAC .
Have you chkd your fuel pressure ?
Did you use oem plugs ,we've seen non oem plugs cause wierd things.
A vacum leak at the intake ,would set off the chk engine light ,lean bank1 or 2
Cop's can be chk with a ohm meter ,but its not acurate or a very good indicator of a failing one.
But since your problem is when its cold it might show a difference in ohm's.
Most of the time they fail when hot.
Rich
Have you chkd your fuel pressure ?
Did you use oem plugs ,we've seen non oem plugs cause wierd things.
A vacum leak at the intake ,would set off the chk engine light ,lean bank1 or 2
Cop's can be chk with a ohm meter ,but its not acurate or a very good indicator of a failing one.
But since your problem is when its cold it might show a difference in ohm's.
Most of the time they fail when hot.
Rich
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Senior User
Joined: Oct 2006
Posts: 196
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From: Corn country
Originally Posted by FortyFords
Clean the maf sensor and the IAC .
Have you chkd your fuel pressure ?
Did you use oem plugs ,we've seen non oem plugs cause wierd things.
A vacum leak at the intake ,would set off the chk engine light ,lean bank1 or 2
Cop's can be chk with a ohm meter ,but its not acurate or a very good indicator of a failing one.
But since your problem is when its cold it might show a difference in ohm's.
Most of the time they fail when hot.
Rich
Have you chkd your fuel pressure ?
Did you use oem plugs ,we've seen non oem plugs cause wierd things.
A vacum leak at the intake ,would set off the chk engine light ,lean bank1 or 2
Cop's can be chk with a ohm meter ,but its not acurate or a very good indicator of a failing one.
But since your problem is when its cold it might show a difference in ohm's.
Most of the time they fail when hot.
Rich
MAF, AIC valve, and throttle body have all been throughly cleaned (i've done as much cheap/easy stuff as i know possible
Plugs are OEM motorcraft's, boots/springs are borg warner.....truck had this miss before i changed plugs...it's actually what made me swap plugs so cant believe brand new boots/springs would be the culprit since it's running the same as it ever has since it started acting funky.
I'll take some brake clean and do some spraying around obvious points and see what happens tomorrow
