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Discussion Starter #1
Hi,

New to site, first post, researching boost issues, as currently have no boost with Passat TDi.

Getting code 17964 - Charge Pressure Control: Negative Deviation

Suspect Vacuum leak as this started straight after a small impact up front.
Car is slowly and methodically coming to pieces...

Thinking of getting a Mityvac, any recommendations?

kind regards
IQ
 

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Yes, the cheap hand pump model is fine if you want to vac test the actuator. But since you had a small impact up front and then this problem started, you could check the metal tube for the intercooler in front and the hose clamps.
 

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Discussion Starter #4 (Edited by Moderator)
turbo compressor wheel

Should I be able to turn the compressor wheel (shown below) on the turbo by hand (finger), when installed in the car and with the intake pipe taken off?



IQ
 

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Ok, a bit of background info....

Car hits kerb...
Kerb cracks sump...
Car bleeds oil...
Car is driven a further 100 yards... and parked up.
Engine switched off.

Car is recovered by local recovery, not present when car is recovered.

When I go to collect car.. to tow to a VW Dealer, I'm told it's OK to start the car to get it out of it's parking spot!

Ignore advice... and manage to push car out to a suitable spot to attached tow bar.
Car is towed to VW for repair of sump.

Sump repaired... £600+ *ouch*... however no boost, hmmm!

VW charge £75 for a diagnosis.
I suspected a vacuum leak, as I had a similar incident before...

Take car to local garage ... unable to find vacuum leak.

I'm unable to give further time to car... due to other demands.

Fast forward 11 months... yeh 11 months!!
The car has been driven for short journeys during this period, albeit without a turbo.
I did have access to a second car.

Anyway, enough was enough... I had to get this sorted.

I've had the following code since getting the car back from VW.

17964: Charge Pressure Control: Negative Deviation.

I checked the vacuum lines and couldn't find a leak.
Next I pulled the fat pipe going into the turbo, and found the compressor wheel is seized solid (as above).

Current situation:

Turbo (a Garrett GT1749VA) removed.
The Actuator checks out with a vacuum pump... smooth movement from 3 inHg to 16 inHg.

Managed to get the 2 housing's off without issues.

Plenty of carbon deposit in the Vane mechanism... cleaned.

However when coming to remove the compressor wheel (8mm 12point wrench), I can't make sense of what to grip on the turbine side.... picture below.



What do I need to grip this without leaving too many scars?

IQ
 
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