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View Full Version : misfire when revving at high rpm?


whitey
03-20-2011, 04:07 PM
well, it seems that my 03 has a misfire whenever i rev it. it seems to happen around 5000-5500 rpm. car has 107,000miles, converted back to a stock tune, from another tune about 3 or 4 days ago to save gas. fuel filter was changed at around 93,000 miles, cop's and spark plugs were changed around 97,000 miles. car is completely stock now. thanks for any and all advice--whitey
Jfierro2010
03-20-2011, 04:21 PM
maybe a coil pack went bad.
Blackened300a
03-20-2011, 04:27 PM
Sounds like a coil breaking up under a load.
DEFYANT
03-20-2011, 05:18 PM
Sounds like a coil breaking up under a load.

What is a quality but cheep replacement?
Blackened300a
03-20-2011, 07:12 PM
What is a quality but cheep replacement?

Musclemerc had a line on motorcraft coils. I would suggest using nothing but OEM.
musclemerc
03-20-2011, 07:37 PM
^^ He got a set last year.

I hope your not having the same issue MMBLUE ended up with. He has low compression on a few cylinders.

Please PM me some more details, but a compression test would be a good thing to look into having done
DEFYANT
03-22-2011, 03:40 PM
^^ He got a set last year.

I hope your not having the same issue MMBLUE ended up with. He has low compression on a few cylinders.

Please PM me some more details, but a compression test would be a good thing to look into having done

No issues. Just curious.

I did have a similar miss once. I checked the plugs and found oil in a couple of plug wells. I chalked it up to a bad connection between coil and plug. I tightend the cam covers, cleaned everything and replaced the plugs. It was time for new plugs anyway.

All good now, but the coils are getting old.
justbob
03-22-2011, 05:59 PM
Should also datalog your FPDC.