This one has me stumped. 109k on 1999 1.8T Passat, only had to replace battery and alternator 3 weeks ago in the 1.5 yrs we have owned it. While my wife was driving in town she "went around a corner" and the car started running very poorly. Ran an OBDII scan when I got home and found a P0301 (misfire on cylinder # 1) misfire on waiting for me.
I have tried to ring out the problem the best that I can to no avail. I have put in new plugs... still P0301. I have swapped coils with other cylinders... still P0301. There is battery voltage (12.45V) and a ground at the #1 coil harness connector; also a flashing LED test light indicates fire signal to the coil. The #1 fuel injector is getting a fire signal as well, and I even went so far as to replace the #1 injector as well (dropped and broke when I was attempting a swap). I have attempted to check the ICM, but am unsure how exactly to tell if it is good or bad. When reading from pin 3 on 5 pin side to all the sucessive pins on the 4 pin side, ohm-meter shows .45 mOhm across 3 of the terminals and 1 Ohm (no connection) on the pin nearest the cab. Does this sound like the ICM? Does anyone know which ICM pin (on the 4 pin side) correlates to cylinder #1? Are non Bosch brands sufficient, or should I stick with OEM for the ICM?
Any and all help is greatly appreciated.