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Old 07-08-2013, 12:22 PM   #1
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Strange Zetec misfire condition

Ok, 2 days ago she started misfiring when the ac was on, ran fine with the ac off. Next day she misfired any time under load, speedo would jump too. Replaced coil yesterday, back to normal operation. Today she started doing it again, only with the ac on though and only under 3k rpm under load. Coil overheating? Plugs were changed in the last 4k miles and she just did a 2700 mile trip without a hiccup. Coil harness looked to be in good shape as well.


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Old 07-08-2013, 12:39 PM   #2
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Nah, a coil wont overheat because of a load condition, it can only overheat if to many RPMs are ran for to long (ie: running 6000 rpm for like 15mins) or if your spark gap is incorect... but be sure to check the coil, plugs, wires, injectors for cracks and look for vacuum leaks.

Here is a great video from eric the car guy on how to diagnose misfires:

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Old 07-08-2013, 12:44 PM   #3
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Vacuum lines have been checked numerous times. Coil is brand new. Wires have been checked as well. Even after a full day of misfiring no cel on.
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Old 07-08-2013, 12:51 PM   #4
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have the same thing it misfires - everything is replaced : wires coil sparks and it seems like running rich and smells - don't know how to treat this and no cel on
let me know if you find out what the hell it is
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Old 07-08-2013, 08:01 PM   #5
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Take Tom (1turbofocus) up on his offer to rent an Xcal, datalog and have him go through it to see if he can find something --> XCAL Loaner Program

...and looks like people crapped on Tom and the program failed. VERY unfortunate.
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Old 07-09-2013, 02:51 PM   #6
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I'm thinking it's an electrical issue, gets worse with ac on recirculate.
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