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Registered
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1,561 Posts
Discussion Starter #1
i have a problem
when im driving and decelerating the car starts bucking or hesitating
so far

new plugs
FRPS
o2 sensors

think it could be a weak coild but i dont know how to pin point that
 

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Head Unicorn
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5,085 Posts
Sounds like a COP. Easy way is a cylinder contribution test which you probably can't do since most people don't have access to the computer software. If you had a steady miss you'd be able to unplug one COP at a time....... A code scan may id the problematic COP.
 

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Discussion Starter #3
i wish this damn thing would throw a code lol
 

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Head Unicorn
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5,085 Posts
It may be doing so. Your EEC also stores Pending Codes, Pending Codes don't activate the CEL. Just because you don't have a CEL doesn't mean you don't have a code stored.
 

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MM's V6 Hater
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13,422 Posts
I had that issue and never threw a code(that time). I hooked my SCT up and there were codes out the ass. I would start there.
 

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Full Frontal Nudity
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1,725 Posts
I have a buddy that works at Ford and he used some diagnostic tool they have and it picked out the bad COP.
 
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