Testing coils on a coil over plug system?

NewHemi · 09-12-2011, 01:37 PM

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

09-12-2011, 01:37 PM	#2
NewHemi Senior Member Join Date: Dec 2009 Location: Ohio Posts: 472 Likes: 0 Liked 1 Time in 1 Post	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