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    VWVortex


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    Thread: Misfire at cold start cyl#5

    1. 02-20-2012 10:01 PM #1
      I posted here a few weeks ago about this issue. Car is 2002 Passat, around 120k. Cylinder 5 misfires heavily at cold start, runs fine when warm. Done so far: new ignition coil, cables, spark plugs, dealer checked compression-good on all cylinders and "flushed" fuel delivery system(that made it misfire on 2 addition cylinders). Dealer said ecm was bad so I had it rebuilt by BBA twice (after first rebuild didn't change anything). BBA supposedly tested the ecm and confirmed it was bad, I say they are full of sh.. and just wanted to collect my $500+. Now I am back to misfire in #5. Spoke to a local VW specialist who is suspecting carbon build up. When I pulled the old plugs out they did have heavy black deposit/crust on them, maybe worse on cyl 5. What's the procedure to clean the carbon buildup on these engines?

    2. Member rayj's Avatar
      Join Date
      Jun 10th, 2009
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      2013 jetta 2.5L auto 2000 2.8L V6 blue wagon
      02-21-2012 11:52 AM #2
      Quote Originally Posted by ZeeGerman View Post
      Dealer said ecm was bad so I had it rebuilt by BBA twice (after first rebuild didn't change anything). BBA supposedly tested the ecm and confirmed it was bad, I say they are full of sh.. and just wanted to collect my $500+.....
      They sent me a bad ABS module, but wouldn't reimburse me the $100 i spent on a VAG scan to figure it out. POS outfit

    3. 02-22-2012 12:53 PM #3
      Yeah, they are not what they used to be...

    4. Member Slimjimmn's Avatar
      Join Date
      Apr 8th, 2006
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      Rochester, MN
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      MK4 shaggin wagon
      04-07-2012 11:08 PM #4
      seafoam your intake.

      There is a small vacuum port on the plastic intake pipe on the back of the motor. Take that off and do a seafoam cleaning.
      the car is on an inclined driveway and up on jack stands in the front only
      04 Jetta Wagon 2.slow------>Family man now

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