View Full Version : Misfiring issue help me please, thanks.

10-11-2011, 04:35 PM
99.5 1.8t Q
Okay so,
I'm sitting at a stop light and all of sudden my car starts to bog down and then it starts running on 3 cylinders. I pulled into a gas station and scanned it and Cyl #2 is misfiring. So i drove it home (right down the street) and replaced the spark plugs, tried again and it start but was still misfiring. My buddy said he would get a coil from work and we would try it the next day so i let it sit over night. Before he came i was going to pull it in the garage and it wouldn't start. cranks but no start. so we pulled out the Cyl#2 plug and coil and tested it. and it was sparking. Swapped that coil with cyl 1 coil and it was sparking, so it isn't the coil So whats going on here? Why after just a night wont my car start? thanks guys.

Pic for your viewing pleasure. Silver one.

10-11-2011, 04:50 PM
compression test but i suggest a leak-down. the compression test can only go so far...Leak down will help you eliminate a value or head issue

10-11-2011, 07:13 PM
^ x2 and check injector.

10-11-2011, 08:32 PM
^ x3 and check your fuel pump too. You just never know lol

10-11-2011, 09:41 PM
Check mechanical timing. Check injector with noid light or stethoscope. Low compression is highly unlikely if it was running good before.

10-12-2011, 07:55 AM
okay thanks guys. I'm going to try swapping out the ICM tomorrow to see if that's it, if that doesn't work I'm on to injectors, and then fuel pump.
I just find it so odd that i was running and then after letting it sit overnight it wont even start...

10-12-2011, 08:15 AM
Sounds like the ICM to me.

10-12-2011, 08:39 AM
When my fuel pump went out it ran fine one day, the next I started it, made it a block, dead. Sometimes they give no warning at all, little buggers