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VW B5 Passat TDIs This is a general discussion about B5 Passat(>98 (2004-2005 in North America)). Non TDI related postings will be moved or removed.

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Old October 8th, 2019, 11:59   #1
Join Date: Nov 2018
Location: Earth
TDI(s): 2004 Passat
Default Almost back on the road...

I am close to being able to claim to have driven a well running TDI. But need some insight. Here is the situation:

EGR fell off, coolant flange replaced, new shocks/struts, new pads/rotors, new alternator, new headlights, new trunk struts, new hvac fan and resistor, cleaned intake manifold and actuator... I have never seen an engine with that much carbon build up. It took 10 hours, 2 full cans of oven cleaner, a screw driver, Dremel, and pressure washer to get as clean as possible. Over 1/4 thick deposit in the location I measured. Got it all back together to find that I resolved all of the trouble codes I was getting. But now the car drives worse (didn't think that was possible) and a new code.

P0299 Underboost. I hooked up my microscan and looked at live readings. Everything looks good except the MAP. MAP reads 0. Car also coincidentally drives like a naturally aspirated turd box. I've been doing a bunch of reading and figure it is most likely stuck turbo vanes (assuming it has similar carbon buildup as the intake, egr, and actuator).

Anything I should check before the turbo? Anything magic to "cleaning" the turbo? Other than avoiding the screwdriver and Dremel...

2004 passat wagon auto - bhw b5.5, 2010 f350, 1999 international 4700 - all diesel.
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