Yummy Coil!
rockNroll=ASP=
02-10-2006, 05:34 PM
Hello all! I was lookin for info on a problem with a grand voyager and came accross this site...looks like a good bunch of folks with a willingness to help :)
I have a 94 Grand Voyager se 3.3 liter gasoline engine that eats the #3 coil in the pack. A new coil pack will last about 10-20 miles before the bottom is melted through and its always the same #3 coil. I checked my 3 computer grounds and they seem good ( 3-4 ohms and .01v drop test). I disconnected the coil plug and the computer plug and checked the #3 coil wire for a short to power and ground and its ok. Using a computer (snap-on modis)to activate the 3 coils gives me the same look for each of the 3 coil circuts. Anyone know of anything that could cause this same pack to keep dying? 5 new coil packs, new wires and plugs,a new computer, and a whole lotta hair pulling-out hasn't got me anywhere :banghead:
Thanks for the board
-Don
I have a 94 Grand Voyager se 3.3 liter gasoline engine that eats the #3 coil in the pack. A new coil pack will last about 10-20 miles before the bottom is melted through and its always the same #3 coil. I checked my 3 computer grounds and they seem good ( 3-4 ohms and .01v drop test). I disconnected the coil plug and the computer plug and checked the #3 coil wire for a short to power and ground and its ok. Using a computer (snap-on modis)to activate the 3 coils gives me the same look for each of the 3 coil circuts. Anyone know of anything that could cause this same pack to keep dying? 5 new coil packs, new wires and plugs,a new computer, and a whole lotta hair pulling-out hasn't got me anywhere :banghead:
Thanks for the board
-Don
moparfanatek
02-20-2006, 03:12 PM
Don, we are in the same mess you are further along in the process though.
Have you checked the wiring harness that goes under the intake for continuity? All the way to the ECM?
:banghead:
Have you checked the wiring harness that goes under the intake for continuity? All the way to the ECM?
:banghead:
rockNroll=ASP=
02-20-2006, 04:42 PM
Don, we are in the same mess you are further along in the process though.
Have you checked the wiring harness that goes under the intake for continuity? All the way to the ECM?
:banghead:
Yes, I did check continuity for all the related circuts as well as checked them all for shorts to power and ground. I did find the problem too! The wire for the #3 coil that runs under the air box actually rubbed through and was intermittently shorting to ground...causing the coil to fire for the entire duration of the contact. The short was never making contact whenever I was checking circuts (so, never showing short-to-ground) but with the movement of the engine would sometimes make contact. I found it by putting in yet another coil which fired all 6 cyls and I had a firefly on my #6 spark plug so I could watch the cylinder fire... I was convinced that somehow, someway, the coild HAD to be overheating due to too much firing. With the engine running I pushed and pulled on all the wire harneses and found that when I move this particular harnes, the missfire would come and the firefly would go to a dim-steady glow. I removed the air box and closely examined the wire harnes and found a tiny spot where the insulation had rubbed through and the wire would arc on the sheetmetal below. The spot was small, on the bottom side of the wire, and very hard to see. Intermittent problems can be a real pain. :banghead:
Have you checked the wiring harness that goes under the intake for continuity? All the way to the ECM?
:banghead:
Yes, I did check continuity for all the related circuts as well as checked them all for shorts to power and ground. I did find the problem too! The wire for the #3 coil that runs under the air box actually rubbed through and was intermittently shorting to ground...causing the coil to fire for the entire duration of the contact. The short was never making contact whenever I was checking circuts (so, never showing short-to-ground) but with the movement of the engine would sometimes make contact. I found it by putting in yet another coil which fired all 6 cyls and I had a firefly on my #6 spark plug so I could watch the cylinder fire... I was convinced that somehow, someway, the coild HAD to be overheating due to too much firing. With the engine running I pushed and pulled on all the wire harneses and found that when I move this particular harnes, the missfire would come and the firefly would go to a dim-steady glow. I removed the air box and closely examined the wire harnes and found a tiny spot where the insulation had rubbed through and the wire would arc on the sheetmetal below. The spot was small, on the bottom side of the wire, and very hard to see. Intermittent problems can be a real pain. :banghead:
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