Passat diesel studdering - TDI Engine -General Info - VWDiesel.net The IDI, TDI, and mTDI source.

• Passat diesel studdering by rowbus on 28 Jun, 2008 20:30
• I have a 2004 Passat which has had a slight studder on the hwy around
  60mph.  Dealer has no answer.  Does anyone have a suggestion
• #1 by bluemotion on 29 Jun, 2008 04:53
• Change the timing, fuel quantity and EGR settings in the ECU, and see if that changes anything.  If that doesn't work, then change the overpriced injectors.
• #2 by the caveman on 29 Jun, 2008 08:51
• There is an unknown tech bulletin on those . I think it's because the ECU is allowing too much EGR at certain rpms . The quick easy fix is to replace the gasket at the output of the EGR valve with one with a very small hole. Find a metal gasket with a hole about 1 cm instead of 1 inch.
• #3 by jtanguay on 01 Jul, 2008 10:08
• or just completely eliminate the egr... it will only lead to an early death for your car.  the nice carbon bits will wreck smooth bearing surfaces.
• #4 by the caveman on 02 Jul, 2008 12:32
• You could eleminate but it'll set of the MIL. Restricing it will cause enough for the MAF to sense the change and think everything's okay. You won't stop all the coking but most.