Hi John, Had my 1998 1.9tdi Quattro for 5 weeks now and it's given me nothing but problems!! On driving it home the day I bought it, it went into limp mode and has never really had any power since then. Turbo doesn't come in (Not limp mode) I've changed the Maf (twice) I've changed the N75 valve and cut the bad bits (frayed ends of the vacuum pipes) each time the car runs spot on for a couple of miles and then drops back to what it was before. It never regains any power unless I change something, take a pipe off, remove power from the valves and then put it back again.
The fault codes on the Vag com are the usual ones and when cleared they come back not straight away but after I've driven a couple of miles.
00553 - Mass Air Flow Sensor (G70) 28-00 - Short to B+
01117 - Generator Terminal DF Load Signal: Implausible Signal
00575 - Intake Manifold Pressure: Control Difference
Anyway, Ive just taken it through a car wash (no comments about being idle and doing it myself, cos a big fat bird did something monstrous on my screen on my way home from work. As I pulled out of the car wash the car went like s.o.a.s. (what that bird did to my screen off a spade). It drove perfect all the way home (5 miles) It's still going well (will be till morning I bet). Anyone any ideas??? I lifted the bonnet when I got in,,, no obvious changes, no water behind the plenum, no wet bits on the engine?????
I've ordered some silicone pipe and gonna re-pipe it later in the week, the boost actuator moves fine blah blah blah,,,, really at a loss now. Maybe time for VWA to have a look????