08 with cylinder 6 misfire
dagan06
10-18-2013, 12:18 PM
Driving last night and my 08 died after searching I found the ICM fuse was blown. I replaced the fuse and now it has a misfire on cylinder 6. I have changed the coil with no luck. I replaced the plugs and wires about 2 weeks ago and I don't find any problem with the plug or wire. I checked at the coil and there is no spark at all on cylinder 6. I was thinking the ICM is bad but was wanting some opinions.
Thanks
Jeff
Thanks
Jeff
Tech II
10-18-2013, 12:21 PM
3.8 or 5.3?
If 3.8, and you have spark on #3, swap coils and see if the problem moves with the coils....
If 3.8, and you have spark on #3, swap coils and see if the problem moves with the coils....
dagan06
10-18-2013, 12:23 PM
3.8 with just under 88000 miles
dagan06
10-18-2013, 12:24 PM
I changed the coil and it stayed at cylinder 6
LMP
10-18-2013, 03:25 PM
remember both 6 and 3 fire at same time from the same coil......(yes the spark fires on the top of the exhaust stroke too) ...so if you have spark on 3, 6 should fire too. Just for fun, I would switch wires 3 and 6 at the coil.....and see what happens.
I.m just thinking.......is it possible that something has happened to the dented cup in the balancer that would not trig the spark when it is due on #6......however you should still have fire on #6 when it calls for # 3.....and 2008 is too young for balancer disintegration.....noooo.
..so....keep us informed of any new findings...this is interesting...
I.m just thinking.......is it possible that something has happened to the dented cup in the balancer that would not trig the spark when it is due on #6......however you should still have fire on #6 when it calls for # 3.....and 2008 is too young for balancer disintegration.....noooo.
..so....keep us informed of any new findings...this is interesting...
Tech II
10-18-2013, 09:10 PM
How are you checking for spark?
dagan06
10-21-2013, 09:12 PM
My neighbor had his dad (former Saturn dealer technician) come and he check spark and there is no spark on 3 or 6. I was checking spark wrong. He thinks it is the ICM
Tech II
10-21-2013, 10:04 PM
Yeah, something didn't sound right......you need an ICM, if you replaced the coil with a known good one, and had no spark....
dagan06
10-21-2013, 10:09 PM
Yeah I replaced all 3 coils with new ones
dagan06
10-26-2013, 08:45 AM
After removing the ICM I found the valve cover had been leaking onto the ICM
Tech II
10-27-2013, 11:52 AM
I doubt that caused the ICM failure.....
dagan06
11-04-2013, 08:25 PM
Oil was in the wire harness so I assume that it caused a short.
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