17964 loss of power

Ghengis

New Member
Hi boppers..
My A2 1.4tdi (90) 135K on the clock, has developed a problem in that as soon as I hit a hill & have to rev it it loses power.
Not sure if it's going into limp or the turbo is failing. EML was on.
It doesn't seem to be smoking and if you pull over & turn it off it seems to reset itself for a while.
I own a basic OBD2 VAG scanner and it threw up 3 codes, 17056, 17964 & 19463.
I checked the intercooler pipes, which seem fine, erased the codes & took her for a spin. Problem still occurred, EML came back on, but then didn't the next time I started her.
Looking at previous threads this seems to indicate a boost pressure issue. I've been underneath & checked the vacuum pipe to the turbo actuator which is ok & I can feel it sucking quite strongly with the engine running & my finger over the end.
The actuator rod doesn't seem to move very much when I try to move it by hand, not at all sure if this indicates an issue??
There's a fair bit of oil on the turbo itself (See pic) which appears to be coming from the union with the air intake tube. This union doesn't look to be sealing very well and I'm wondering (hoping) there's a failing O ring in that that could e the cause of the entire issue?
I've found a thread with a link to instructions on disassembling the turbo & cleaning, but removal looks to be a bit of a job. Is there anything else I should be checking before I launch into Turbo removal?
On the plus side, Cambelt is due fairly soon so I may as well fit a new cartridge whilst I'm doing that I 'spose.
The most annoying thing is I'm currently having the most wonderful love affair with a lass who lives on a narrowboat 3.5 hours away and my only alternative transport is my 45 year old Moto Guzzi Le Mans, it's torturous to ride & it's currently blowing a gale here in Devon. HELP!!!
 

Attachments

  • a2 turbo.jpg
    a2 turbo.jpg
    3.1 MB · Views: 33
Last edited:
You can check the codes on the Rosstech website for more details and possible causes here; 17056 (glow plugs), 17964 (charge pressure negative deviation) & 19463 (camshaft position sensor)
 
I would start by checking all vacuum hoses to and from the turbo boost control valve N75, if good start with the N75 valve
 
Tdi 90 works differently to the AMF 75. So double check the error codes you are getting against the correct engine. VNT turbo also works a bot different to the AMF one.

In the end hopefully just a loose or split pipe but can not rule out the controller.
 
Be careful with the air intake pipe, the nuts are 8nm only and likely brittle, its push fit with a rubber o ring as you said.

Under boost is more than likely the control of the variable vanes not moving enough to match expected boost. Likely coked up inside where the tiny pins and tracks get messy.

Doesn't sound like turbo off either way too find out.

5mm samco hose worth fitting as you check the rubber ends, replace them.
 
Back
Top