Question about 2001 Volkswagen Eurovan
I have a Transporter 2.5 TDI that had similar problem. I found the small pipe that supplies boost pressure the the waste gate valve had worn through. This caused a over boost condition at revs over 2500 rpm and the computer reduced fuel to counteract the over boost. I would start looking in that area. You may find your solution there also.
Posted on Feb 01, 2009
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Posted on Jan 02, 2017
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Oct 03, 2013 | Cars & Trucks
This problem is commonly caused by a dirty automatic idle speed control valve and throttle valve but always run a OBD2 fault code as well as the cleaning procedure. Buy a can of throttle valve cleaner (do not use carburetor spray cleaner!) from NAPA or Carquest (made by CRC chemicals) and spray it into the air intake while the engine is running, use up about 1/2 the can, engine will try to stall hold the speed up, shut it down and let it soak for 30 minutes, restart and blow out the remaining fluid, shut it down and disconnect the negative battery cable for 5 Min's to reset the base idle control. If the above cleaning doesn't cure your issues you need to have the computer controlled automatic idle speed control system diagnosed and repaired by a dealer or electronic engine control repair shop.
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