Multivan losing power?

[shogun2]

Have already refilled on the way over, but still have the problem.

Air and fuel filters sound plausible.

How do I check a boost leak and injectors and turbo vanes? Suppose a specialist has to do some of these things.

No other symptoms I can think of.

[Golf Loon]

Where are you based in sydney??
I am closed for the hols but can find time to scan your car if you need.

[gregozedobe]

How do I check a boost leak and injectors and turbo vanes? Suppose a specialist has to do some of these things.

You could have a listen for obvious air leaks with the bonnet open and someone revving the engine, but a scan is a better indicator (will show actual boost way less then requested). This can be done by anyone with VCDS(VagCom), not just dealers. A scan might also show up insufficient fuel flow.

VCDS is apparently better for some diagnoses, as you can do logs on various factors, not just scan for error codes.

Not really sure how you check for injectors (although it might show up as increased fuel consumption due to poor atomisation of the fuel).

You said it was lacking power at mid-range revs. What is it like at low (1,400 to 2,000) revs and high (3,000+) revs ? Is the response better/worse/same when cold/tepid/hot ? That might help with narrowing down possible causes.

Just thought of some other possible causes:

Intake blocked with crud (more common on higher mileage TDIs) not allowing full flow of air into the engine.

Accelerator pedal out of adjustment (not requesting full power even though the physical pedal was pressed all the way to the floor). This one was picked up by a bloke on the Brick Yard forum through VCDS logs - only showed up as max 70% load when he was pedal to the metal. Easy and cheap to fix (small adjustment to the linkage in the pedal box - IIRC his was loose), but tricky to diagnose.

Brakes dragging slightly (feel a wheel after you've been driving) - stop without using the brakes too much, and be careful you don't burn yourself.

Please keep us informed.

[shogun2]

Where are you based in sydney??
I am closed for the hols but can find time to scan your car if you need.

I'm at the end of Oxford street in the city, at the Hughenden Hotel.