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Go Back   TDIClub Forums > TDI Model Specific Discussions Areas > VW MKIV-A4 TDIs (VE and PD)

VW MKIV-A4 TDIs (VE and PD) This is a general discussion about A4/MkIV Jetta (99.5-~2005), Golf(99.5-2006), and New Beetle(98-2006). Both VE and PD engines are covered here.

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Old March 24th, 2017, 23:28   #16
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Join Date: Oct 2012
Location: Kitchener, ON
TDI(s): none

Originally Posted by wonneber View Post
What seal is the 'main seal' ??
Is there a common one that could leak air in?
Only one will let air in and that's the mainshaft seal, which is the hardest because you have the remove the hub pulley, or more accurately, put it back on correctly.
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Old March 25th, 2017, 10:19   #17
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Join Date: Aug 2013
Location: Washington

OK, I fixed my issue. As embarrassing as it is, I will tell you what it was..

When we did the clutch job, we pulled all sorts of parts out of the way. I had failed to properly install the engine end of the air intake duct. It had wiggled off and was replicating the same symptoms of a lazy MAF sensor. It would butt up tight now and again, and let me have that good pull. Then it would leak air and throw off the MAF output and cut fueling.
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Old March 28th, 2017, 13:29   #18
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Join Date: Aug 2008
Location: Reno, sort of...

You are not the first to have that happen, and I am sure you will not be the last. Glad to hear you found the problem.
2001 Jetta GL TDI, 35/15% Tint, Ventectomy, Catectomy, EGR-ectomy, Stage 4 TDTuning, PP764's, Stealth 17/56 Garrett, VCDS Hex+CAN, South Bend Daily Driver 2 Clutch, DG Short Shifter, Previous Diesel: 1983 Rabbit Diesel
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