2001 - (Y) 100BHP Passat Below Full Power Fault - Diagnosis Help Please!

[Laurie2212]

Thanks Martin...

Someone else suggested simply disconnecting the Air Mass Meter, and driving the car like that... I did it at lunchtime, and it does seem to have far more low end grunt with it disconnected, but this was only "round town" type driving.

I'm saving it for the motorway run tonight to really see (on the roads where I experience the biggest lack of power), to see if there is a difference. Fingers crossed.

In respect of your suggestion - should it turn out to be a turbo fault, or turbo actuation fault, would you expect it to be a "replacement parts" type job (likely to be pricey), or a damn good cleaning and service type job of the offending parts that are letting me down currently?

Richard

Hi

Can I suggest that you follow Martin's advice - I had a similar problem, took advice from Martin & Crasher - code read diagnosed overboosting turbo - removal, re-building (by Midland Turbos) and re-fitting by local independent was £500 all in. Between them, they saved me £1000!

Hope you get sorted

Regards

Laurie

[rjsdavis]

Hi

Can I suggest that you follow Martin's advice - I had a similar problem, took advice from Martin & Crasher - code read diagnosed overboosting turbo - removal, re-building (by Midland Turbos) and re-fitting by local independent was £500 all in. Between them, they saved me £1000!

Hope you get sorted

Regards

Laurie

Thanks Laurie

But am hoping that its not going to cost anything like £500! That would be a bloody disaster..... (just before Christmas!)

[daledenby]

My A4 130 TDI has just started doing this,fuel comsumption is OK etc.
What was the outcome of this?

[martin1810]

Always start with a code read. Ask for a complete print out from the ecu, not just codes.

[rjsdavis]

My A4 130 TDI has just started doing this,fuel comsumption is OK etc.
What was the outcome of this?

Hi daledenby

Not sure I'd agree with the code read... most garage's are going to charge you for this!

I got a whizzy bit of advice, which was to disconnect the MAF sensor, and then drive the car to see if it improved the performance. I did, and it did. Made a big difference, so it was immediately obvious that the MAF was mullered.

Had a double-check on it from the garage whilst it was in for a service, and the only code fault's coming up on the snap-on tool were for the MAF. MAF was replaced, and the car was back to normal. Fitted it myself, to save myself an hour's garage labour too....

Easy.

[badade 1.8t]

Hi

It sound like you have the same problem that I had a bit time ago, read the code first will give you a bit understanding where you need to go, in my situation every mechanic was saying need new turbo inc. VW dealer (but not guys here) as I don't have very great experience under the hood I did manage to find a mechanic that was not scare to get his hands dirty and he found split plistic tube from turbo system just under where coolent tank is, trust me don't send or do anything with turbo until you have code and ask about it on here, I was driving like this for about 2 months but this saved me £600+vat for new turbo or recon price

Good Luck

[daledenby]

I had the fault codes read and it came up with 'boost pressure too high'.
The mechanic was almost certain it would be the MAF so he replaced it with one he keeps for testing purposes(he said that he's having to fit around 6 of these a month).The car set off with full power for around 5 seconds then it was back to normal.Obviously it requires further investigation into the problem and i have it booked in for next monday.I'm starting to think its going to cost me a packet.

[martin1810]

daledenby...Find a mechanic that knows what he's doing. Boost pressure too high can't be a faulty MAF. It is nearly always stuck turbo vanes. It can be a falty MAP sensor or MAP valve.