Set off this morning- car incredibly slow, acceleartion snail like. After a mile was better , if still flat and not picking up well at all. Drove home- from cold - just the same- slooow for a few minutes then better but not right. In garage friday- any ideas ? Feels like no boost- but not blown turbo as it improves. So..must be ECU having an electric fit ? .

Limp-home mode? DPF problems?

That would be my first guess, as well.

No display lights on?

Limp home mode shows a spanner on the display which blinks. It is easy to tell, if you had the DSG, as you would only have 1st gear available!

No DPF issues - no warning light anyway.Also gets the sort of use which I think would make it unlikely- no town driving, not many short trips and a good blow through, as it were , on A roads regularly.

Does the Yeti have a variable vein turbo? This is where the fins on the turbo move to give different boost levels, if this is faulty it can spin and make no pressure.

Could also be a clogged fuel filter or fuel starvation.

Maybe.......

Maybe it's not running very well.

Apart from that I have NO idea. :think:

seem to remember something about the actuator on the yeti being electric rather than vacuum, dodgy plug / connector?

also a few reports on here about possible problems with the system, but if that was the issue i would have expected a dash light or two

Or you may be a switching from a petrol, mine felt the same at first but once i knew tha the turbo kicks in at 1500-1750rmp its great now.

Good chance one of the system sensors is not working properly. I've had something similar with a TDI (not Yeti) where the mass airflow sensor went. No lights showed on the dash, it just went very slowly.

Edited 28 August, 201213 yr by Zib

Ditto Zib,

Mine went on a Golf TDi, didn't notice at first till I drove a hire van which flew up a local hill, the difference was then blindingly obvious

Stone under the throttle pedal?

Or you may be a switching from a petrol, mine felt the same at first but once i knew tha the turbo kicks in at 1500-1750rmp its great now.

Ermm... no. I think I know what a VAG turbo diesel feels like(after 13 years of them and 24k in the Yeti)

Stone under the throttle pedal?

No- but having had that in Tiguan it's a good call- not at all obvious it iS a stone to begin with

It is certainly a fault with the turbocharger,my friend had the same problem with his yeti, the pull was sluggish to say the least and he had the unit changed under warranty.The spanner icon means there is a fault.

Edited 29 August, 201213 yr by oriki

To dealer today; it's a secondary pump (not much wiser ) but will be replaced under warranty. Exhaust - not DPF - warning light appeared en route to garage and apparently pump installed for use in v high temps- so rarely used here.Will try to understand this when I talk to garage- pump being what ? Not fuel nor water but something in exhaust ?? Or attached to turbo? If it had twin SUs I might have a vague chance of understanding this...

This outlines the principles : http://en.wikipedia.org/wiki/Secondary_air_injection

Here's a gool ol' boy showing us what it looks like:

And here's someone fixing one on the street:

Ah ha - all is clear . Thanks.

The intercooler on my Audi also once went south... it was amazing how slothlike a diesel car is without the full use of the turbo and / or intercooler! Accelaration was glacially slow...