- Help! AEB 1.8t with "Multiple Cylinder Random Misfire" and Cyl 3 Misfire codes
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    1. Member Passat514's Avatar
      Join Date
      Mar 31st, 2005
      08 Passat 3.6 4-Mo, '08 Armada
      07-09-2008 09:42 PM #1
      Hello All,
      I'm coming to the forum looking for help diagnosing a problem that has a master Audi Tech and I stumped.
      The Problem: Multiple Cylinder Random Misfire, Misfire on Cyl 2 and Cyl 3 codes. Runs fine on highway after first start in the am. Begins to misfire badly/throw code within 1 mile after exiting highway driving and starting "stop and go" city driving
      The Car: 1999 VW Passat 1.8t "AEB" engine code
      192,xxx miles. Greedspeed/Neuspeed ECU. All else is stock
      ****ICM module replaced less than 1000 miles ago due to misfire/similar problem. All was fine until now*****
      Compression tested (cyl 1-4): 155lbs, 150lbs, 145lbs, 155lbs
      Repairs/troubleshooting tried already:
      Swapped cyl 2 and 3 coils for cyl 1 and 4. Result: problem remains / same error codes (cyl 2 and 3 misfire / random misfire)
      Swapped cyl 2 and 3 injectors for cyl 1 and 4. Result: no change, problem remains
      Any ideas / recommendations on where to go from here?

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    3. 07-09-2008 10:54 PM #2
      well older vw cars that have the miss fire problem can be the coil pack wiring harness or bad coil packs. I have a Aww 1.8t and i have 6 year old coil packs and origianl coil pack wiring harness . I have all new ngx spark plugs and i use 91 octane fuel . i still get random miss fire codes all the time and have logged lots of miss fires. My car runs and drives great yet i looked at my coil pack wiring harness . it has multiple cracks on all wires. my buddy owns a garage and he has covered the craks with some silicone but he sugeested that i replace the harness now that my car is getting older . Vw has remade the harness and i will also replace the coil packs since they are old and i want to go with the newwest revision and use a bolt down type hitachi coil pack . from what i read on here that will really help the randon miss fire code problem

    4. Member Junk T.I.'s Avatar
      Join Date
      Sep 17th, 2003
      central NJ
      07-09-2008 11:20 PM #3
      AEB cars have a common issue. there is a coil output stage on top of the air box.
      its a little module with a connector on each side. one has 4 wires and one has 5 wires. that out put stage goes bad commonly. looks like this pic
      01 GTI 1.8T big turbo ghost...
      02 Jetta GLX

    5. Member Passat514's Avatar
      Join Date
      Mar 31st, 2005
      08 Passat 3.6 4-Mo, '08 Armada
      07-10-2008 07:58 PM #4
      Tested the power output stage (aka Ignition control module) with multimeter and the circuits were "open" in both directions.
      Is it odd that a 2 month old ICM/POS failed?
      Should I be looking for a root cause to the POS failing?

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