2.7 TDI Turbo Question

[smaugc6]

Hi, sadly my turbo on my 2.7 TDI 2005 has died. Ive bought a new GTB1756 for the car but this is the wrong turbo, it has a what looks to be a BV50 with the VDO siemens actuator. I thought all 2.7 tdi's had the GTB1756 Turbo, does anybody know if this is right?.

[smaugc6]

IMG_4010.jpg

[smaugc6]

IMG_4014.jpgIMG_4011.jpg

[smaugc6]

So I have now replaced the Turbo, however new faults have cropped up.

The reconditioned turbo is p/n 059 145 715EIMG_4060.jpg

The car drives really well and it feels like theres more power and its smoother, than with the previous turbo before it became faulty.

I am however getting Fault codes below, and I tested the car with a good run and discovered the car goes into limp mode (flashing glow plug light and low/no boost) around 3700 revs or more, this doesnt occur before that.

P3348 - Control Circuit for Controller for Turbocharger 1 (J724): Electrical Malfunction
P0234 - Boost Pressure Regulation, Limit Exceeded (Overboost Condition)

OBD2 - confirmed:
P0046 - Turbocharger/Supercharger Boost Control "A" Circuit Range/Performance

OBD2 - pending:
P0234 - Turbocharger/Supercharger "A" Overboost Condition
P0046 - Turbocharger/Supercharger Boost Control "A" Circuit Range/Performance

Any ideas what this may be? I feel like the VDO actuator needs to be calibrated.

[Ben@Venom]

Hi

Have you got it sorted yet? They do need calibrating, we offer this service, give us a ring if you are struggling mate.

01132771010
Turbo Clinic UK Ltd

[smaugc6]

Hi ,

Thanks for the reply Ben,

you guys are quite far away from me.

I have had the turbo inspected by the company I bought it off. They replaced the actuator and calibrated the new one again, I recall a number 82% on the final cycle after this was done. He said the turbo was getting stuck on the top position. However this has not fixed the problem. The garage that replaced the turbo (different garage) are dumbfounded and said they cant do anymore.

The best way I can decribe my problem is the turbo doesnt always work when I floor it, like its not spooling up. however if I let go of the accelerator pedal and floor it again sometimes it does work. When it does work it is working from 1500rpm-3000... and higher and it does feel like its at full power. On the motorway I can tell the turbo works from 1500rpm onwards in 6th.

I have a new fault now Lambda sensor bank 1 sensor 1 open. I didnt realise diesels had o2 sensors. I have explained everything to another garage who said its worth a try changing it but may not solve the turbo problem. Does anybody know if a lambda sensor can cause this?

The original turbo had blown up, the exducer fan was damadged and a VGT vane had come off. Im wondering if these part flew down the downpipe and damadged the lambda sensor. Wonder why the lambda sensor fault hadnt shown before.

[smaugc6]

Just a quick update, turbo problem fixed. Turned out to be a rubbish refurb I had done, I went to another turbo workshop who diagnosed sticky vanes. A newly refurbished turbo shouldn’t be sticking like that. I asked them to do what’s needed to fix it. They did just that.