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Old 10-18-2012, 06:38 PM
macoombi macoombi is offline
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2003 Altima
1994 Sentra
2002 Altima 2.5SL
 
Join Date: Jan 2009
Location: Ottawa, Ontario
Posts: 23
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In my experience, misfires with Coil On Plug engines is 99% of the time related to a bad coil and it's not totally unheard of to get bad coils out of the box or shortly after installation.

I've replaced all the coils in my wife's '03 SL a couple of times (at least). I ran some 8 gauge wire from the ground terminal of the battery directly to the engine and haven't had any go since then.

I used to own a '97 Taurus SHO (V8) with COPs and it had the same problem. It would misfire intermittently but not bad enough to set a code. It was always a coil, not a plug or injector.
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