Switch the coils and see if it's still the #2. Then you know it's the ICM (which I bet it is). If the misfire is on another cylinder then it's the coil.
You can get the ICM HERE for fair price.
You can get the ICM HERE for fair price.
NEED HELP! Misfiring
98 1.8t 70k. Driving home car stumbled and got flashing CEL. Hooked up Vag-Com and got codes 16684 & 16686. I had the car towed to my house. I am pretty sure it is either a coil pack or the ICM. How can I determine which it is. Cylinder 2 is always misfiring then I get the random misfire code. Can I switch coil packs and see if it misfires in the exchanged cylinder? I need to determine which part to order and get back on the road. The 90 Comanche doesn't cut it for work.
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yep i had the same problem couple months ago...misfiring on cylinder # 2 ....it was the Ignition Control Modulejudedude said:98 1.8t 70k. Driving home car stumbled and got flashing CEL. Hooked up Vag-Com and got codes 16684 & 16686. I had the car towed to my house. I am pretty sure it is either a coil pack or the ICM. How can I determine which it is. Cylinder 2 is always misfiring then I get the random misfire code. Can I switch coil packs and see if it misfires in the exchanged cylinder? I need to determine which part to order and get back on the road. The 90 Comanche doesn't cut it for work.
Here's a good writeup on verifying ICM failure: http://www.clubb5.com/forums/viewtopic.php?t=66779
Kenny
Kenny
Thanks for the help. I ordered the ICM at the site you recommended. Hopefully this will solve the problem. I exchanged the coilpacks and still got misfires on the same cylinder.
When were your plugs last changed? Fresh plugs cleared up my random misfires.
Could also be the throttle body needs cleaning. My 98 has done the stumbling misfiring thing twice and cleaning the throttle body cleared it up both times.
It was the ICM. Had it Red Labeled from Busdepot. Installed and back on the street. Thanks for all your help.
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