Username or Email Address
Do you already have an account?
Forgot your password?
  • Log in or Sign up

    Fourtitude.com


    Results 1 to 4 of 4
    1. Member Passat514's Avatar
      Join Date
      Mar 31st, 2005
      Location
      WI
      Posts
      313
      Cars
      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?

      Thanks!


    2. 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

    3. Member Junk T.I.'s Avatar
      Join Date
      Sep 17th, 2003
      Location
      central NJ
      Posts
      2,873
      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
      VW/AUDI MASTER GUILD WRENCH

    4. Member Passat514's Avatar
      Join Date
      Mar 31st, 2005
      Location
      WI
      Posts
      313
      Cars
      08 Passat 3.6 4-Mo, '08 Armada
      07-10-2008 07:58 PM #4
      Bingo!

      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?


    Posting Permissions

    • You may not post new threads
    • You may not post replies
    • You may not post attachments
    • You may not edit your posts
    •