I've had my 2003 Audi A4 1.9TDi for nearly a year and been very pleased
with it however on 3 occasions I've noticed odd behaviour. After approx
half an hour of enthusiastic driving on A roads (i.e lots slowing for
junctionas etc and then rapid acceleration) I seem to loose most of the
power, acceleration is VERY sluggish. There are no warning lights or
other symptoms. If I stop and re-start the car immediately the problem
is gone. It's only happened on three occasions some months apart with
plenty of similar driving in between
Any ideas as to the cause?
OK it was just that the auto's have a remember function (mine seems to)
whereby they get used to driving techniques. I travel the same roads every
day for 5 days per week, if I take a detour along a certain road that has a
fairly steep hill, when I reach the top the box stays in 3rd or 4th for a
while over the top. No matter what I try it will only change when it wants
yes yours is probably turbo related.
Get the codes read with VAG-COM or a dealer computer.
It sounds like a sticking VNT mechanism on the turbo. It will probably
leave a code 'overboost detected' or similar. The vanes stick, the turbo
overboosts, so then the ECU shuts down the turbo. That's why turning it
off clears it. This almost always happens after or during hard
The official fix is a new turbo, though you may get an improvement by
working the VNT mechanism back and forth a bit by hand.
http://forums.tdiclub.com/showthread.php?t 0910 may also help you out,
shows the VNT mechanism in action.
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