04 pzev 2.3 bucking issue/ flashing cel - Focus Fanatics
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Old 05-02-2014, 06:14 PM   #1
Steenracing
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04 pzev 2.3 bucking issue/ flashing cel

Hello any help would be appreiciated ,not sure if this post is in the right place. So my 2.3 5-speed has an occasional buck in low rpms which i can deal with.... but today getting on the highway i put the car in 5th and then the car starts bucking or misfiring not sure which then the check engine lights starts flashing this goes on for 2 miles then i figured i should try flooring it well after i did that the bucking/misfire stops and also my c.e.L turned off complety was on before but ive started and shut off the car a few times and the cel still hasnt came back on . So my question is did my computer reset something ? Also whats this bucking caused by im guessing vacuum leak any helps appriciated feel free to move this wherever it needs to be.


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Old 05-02-2014, 09:33 PM   #2
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Did you run codes?
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Old 05-02-2014, 11:31 PM   #3
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The bucking & flashing CEL would indicate a "serious misfire" when officially you're supposed to pull over to prevent catalyst damage.

Looks like you got lucky & a fouled plug cleaned up (other guesses seem less likely (water in a plug hole/loose wire/connection) since it cleared up).

Might want to take a look at those & the boots on the coils if that hasn't been done. Even with "100,000 mi." plugs servicing sooner often helps.
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Old 05-02-2014, 11:34 PM   #4
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Moved to "General Technical Chat".
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Old 05-03-2014, 01:03 PM   #5
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Thanks sailor, put copper autolites in about 6500mi ago, think its time to replace plugs again ?,I gapped them at .065 which i belive is in the middle of perfomance/life gap rating. .... also car only has 80,000mi
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Old 05-03-2014, 03:53 PM   #6
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That's a big gap. Big gaps don't help performance, but they do put a heavy load on coil packs.
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Old 05-03-2014, 10:32 PM   #7
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Check this "sticky" from Duratec performance:

http://www.focusfanatics.com/forum/showthread.php?t=251453

.055 is the normal gap, most who tried .065 had to reduce that to get it to run consistently. Experimenting to find the max. useable gap didn't result in any noticeable improvements - and when the gap is too large results like yours were the consequence.
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