:( Hi, our tdi is running but the turbo isn't ! It's been on the diagnostic computer which showed no faults ! The turbo filter is full of excess oil which is leaking out. Any ideas of what the problem is would be great thanks :S !

I take it you mean the intercooler. If so it is not unusual to have oil coming out of the joints in the pipework thanks to the crap recirculation valve (crankcase breather) which feeds hot oily air from the top of the engine into the air intake before the intercooler, thus leading to a build up of oily muck in it.

What was the computer used, was it the dealer equipment, or VCDS, or some code reader?

as above, plus oil can then seep out through the ventilation holes in the EGR/antishudder assembly too.

If the turbo isn't "working" then maybe there is a vacuum fault, sensor fault, or sticky vanes, but all of those should generate a fault code. It might be worth driving the car with the MAF unplugged and if it drives better than the MAF is probably at fault (and may not log a fault). Otherwise CTS or n75 valve maybe at fault but both of those generally log faults.

When were the air and fuel filters last replaced?

Which engine? 90, 110 or 130?

Thanks for the replays, we just bought the car so are in the process of changing filter etc. I's the 90 engine and the computer check wasn't at the main dealer, im not sure what type in was. We'll check out the other possible faults listed, and see how it goes, thanks again .

Some 90s have VNT based turbo and other have a wastegate. If the VNT then the vanes/control ring might be rusted/seized.

Out of interest, what makes you say the turbo isn't running - given the car is new to you?

Good luck with your investigations

It's a retired taxi we bought from my husband's boss so we knew it wasn't running properly, my husband's been driving octavia tdi's for years and this one runs like a non turbo diesel !

Hubby has just told me that it's been on 4 different computers and has always shown no faults !

Edited 6 June, 201115 yr by vrs 54

Fair enough. Start with running it with the MAF unplugged.

Then try sucking on the vacuum control pipe to the actuator and see if the you can get the control rod to move in the turbo. If it is all creaky and non-smooth then the chances are it is the VNT mechanism at fault (assuming it is 90vnt).

As there are no fault codes some proper invesitgation will be required, which rules out all main dealers, as if the can has no fault codes stored they believe the car is running properly

It is possible (not likely but possible) to get an intercooler so full of oil and cr@p that you lose mass air flow (the pressure is fine up to the intercooler, but is used pushing air thro the cooler rather than boosting the engine. Is the car smokey?

It is possible (not likely but possible) to get an intercooler so full of oil and cr@p that you lose mass air flow (the pressure is fine up to the intercooler, but is used pushing air thro the cooler rather than boosting the engine. Is the car smokey?

Might one not expect to see a fault logged by the MAP?

Just another thought, maybe the EGR/anti-shudder assembly is seriously blocked and limiting airflow.

Might one not expect to see a fault logged by the MAP?

Just another thought, maybe the EGR/anti-shudder assembly is seriously blocked and limiting airflow.

I would have thought that would cause an error as the pressure between the intake and intercooler would be too high, isn't that where the MAP sensor is?

I would have thought that would cause an error as the pressure between the intake and intercooler would be too high, isn't that where the MAP sensor is?

I am wondering if the MAP sensor is borked....

The car is now in bits in our garage and Darren (husband) is covered on oil . Fingers x'sd a dam good clean will fix it. The whole turbo, especially the intercooler is totally covered in oil and crap. Darren tels me the EGR has been replaced,your all getting a bit technical for me now, my knowledge of engines is pretty basic really! Thanks for your help all

Edited 6 June, 201115 yr by vrs 54

Fair enough. Start with running it with the MAF unplugged.

Then try sucking on the vacuum control pipe to the actuator and see if the you can get the control rod to move in the turbo. If it is all creaky and non-smooth then the chances are it is the VNT mechanism at fault (assuming it is 90vnt).

As there are no fault codes some proper invesitgation will be required, which rules out all main dealers, as if the can has no fault codes stored they believe the car is running properly

LOL, your right there

The car is now in bits in our garage and Darren (husband) is covered on oil . Fingers x'sd a dam good clean will fix it. The whole turbo, especially the intercooler is totally covered in oil and crap. Thanks for your help all

Here are some pictures from when I cleaned up bits of my car:

EGR - 2007

EGR - 2010

Turbo clean - 2010

Good luck, hope you/Darren get it sorted

Edited 6 June, 201115 yr by mbames

Thanks very much for all your help, and cheers for the photos, im sure Darren will be referring to them when he tries to put the car back together .

Edited 6 June, 201115 yr by vrs 54