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Old 09-12-2011, 01:37 PM   #2
NewHemi
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Default Re: Testing coils on a coil over plug system?

There may be better ways.... But the best way I have found so far, is either heat/temp check on exhaust via EGT readings, or using a touchless thermometer. (bought mine at Harbor Freight for a few bucks) See if one cylinder is cooler than others.

Or if that doesnt work, then it is just brute force... replace (or if you don't have a lot of spares, rotate by putting a spare one in, and if no change, move the removed one into the next position, etc.) each one until you see a difference. No difference, no problem...

When we had problems with a coil pack, it only showed up at load, or higher rpm. At low rpm, it worked just fine.

Good luck Art!

David
The New Hemi Guy
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