VW Passat TDi high revs on start-up | Technical matters | Back Room Forum

Sun 30 Oct 2005 21:10

VW Passat TDi high revs on start-up - L.Cleaver1

1999 V Plate Passat Estate TDi Auto (Tiptronic) done 128K without starting problem until two days ago - now happened twice in two days on cold start up.

Problem is extremely fast revving for two/three seconds (basically as if I'd hit the accelerator a few times) then settles down and runs smoothly as usual. The revving up and down is much faster than could be done by blipping the throttle to the floor a couple of times. Given next service in 2K miles (about 5 weeks or so), is this worth worrying about or should I get it to a VW specialist ASAP?

Any comments appreciated......

Cheers

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Tue 1 Nov 2005 00:39

VW Passat TDi high revs on start-up - Screwloose

Is this an early TDi PD? If so; it might be one of your unit injectors is coming loose: is the sump oil level increasing?

A brake pedal position sensor, or a fault with the fly-by-wire throttle might also cause this.

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Fri 4 Nov 2005 22:07

VW Passat TDi high revs on start-up - L.Cleaver1

Thanks Screwloose much appreciated - sorry for delay in posting.

The car is 1999 V plate (AJM engine code I think) so one of the very first TDi PD engines.

It's due for a 130K service in the next couple of weeks so I'll get the independent specialist I use to look at these points.

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Fri 4 Nov 2005 23:26

VW Passat TDi high revs on start-up - Screwloose

LC

If it's an AJM; one other thing that you could try, is a new engine coolant temperature sensor. There's been a rash of those failing lately.

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