Unsolvable problem?! 2008 Touareg 2

Old 02-02-2016, 01:47 PM
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Default Unsolvable problem?! 2008 Touareg 2

Hey all-

Brand new to the forum, so apologize if I am posting in the wrong area, or missing relevant information. I am desperately seeking help as I cannot find the issue. Here's the run down.

I have a 2008 Touareg 2, V8, 4.2L.

I bought it used (~95k miles) and almost immediately had an issue. #5 is misfiring. Since then, it has been in the shop 10-12 times with no resolution. Here is what I have done so far:
  • Put in all new plugs/coils
  • sent the ECU to SIA electronics in Chicago for testing - no errors
  • replaced the injector with a new injector on #5
  • swapped #1 for #5 (plugs/coils)
  • checked the harness (dealership said they did this, but not sure if they did or are just tired of me)

Through all this, #5 is still misfiring. The dealership is out of options, suggesting that the ECU is faulty and needs to be replaced ($1600) or they need to swap the #5 injector with #1 to see if that is the issue (~$1000+). Neither of these options sound reasonable because a) the ECU was already tested and b) the injector is brand new, yet the exact problem (#5 misfire) has persisted before and after the injector replacement.

What the hell do I do?!?
Old 02-02-2016, 07:16 PM
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Join Date: Sep 2009
Location: Stoke on Trent, England
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You don't say where you live?

You need to get your motor scanned (preferably with VAG-COM\VCDS) for any error codes logged in the ecu and post them, that will save a lot of guessing.

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