Turbo Boosting Problems

[sython]

Hi, all I have a 1.9TDI W reg 2000, which has a turbo boosting problem..

 

Some of you may have seen my first post afew months back, when my turbo went.

 

http://www.fordgalaxy.org.uk/ford/index.ph...c=16934&hl=

 

So, had a nice shiny new turbo fitted (New not Recon), and now it has a boosting problem.. ARHHHHHHHH

 

it seams to reach about 40MPH, and around 3000RPM when you can feel the turbo cut out. The car seams to pull back. From then onwards, it struggles to hit 60MPH, and slows down on hills :s !!!

 

I have had a mechanic look at it, who replaced the CAT. and then Replaced a sensor, the sensor which is connected to the air hose (sorry not mechanically minded, been out of the game for a while)

 

Now the mechanic is not sure what to change next, he was talking about the valves?

 

Any one shed any light on this problem, and what can be the cause of it. and how to fix it, its just so annoying...

I have read about this "limp home" but this is due to the turbo being dirty, mine is new, so not this... I read another thread about a hose split, which hoses do i check??

 

 

I wish i never bought this car /sigh !!

 

 

Thanks everyone, every reply appreciated.

Edited December 15, 2008 by sython

[seatkid]

Check all the vacuum pipes, start at the turbo and work your way back. They can split, come apart and sometime collapse internally. The turbo boost is controlled via a vacuum operated actuator on the turbo. This vacuum is regulated by a solenoid valve mounted on the bulk head. If the ecu detects an underboost or overboost condition (measured by the boost pressure sensor) - it goes into limp home mode - all vacuum is dumped - to protect the engine. Switching engine off resets this mode.

 

Its a very common problem and no doubt many turbos have been needlessly replaced for the sake of a bit of rubber pipe.

[f0ster]

hello

yes I agree with seatkid, I have carried out extensive diagnostics using ford wds on this problem, basically what you are "probably" getting is the turbo

overboosting, when the pressure gets past 2.2kpa the ecu shuts down the system in to a fail safe mode, I assume on yours that you have to switch off the engine to reset the ecu, on the early galaxy all that is required to reset the ecu is to back off the throttle and you are away again, a v reg galaxy that I fixed with this problem required the n75 valve replaced and all of the vacume pipes that control the turbo, oil can get in to them and block the free passage of air,

you then get a situation in which the ecu has detected too much boost, it then tries to limit the boost via the n75 valve but because of the partially blocked pipes the control rod on the turbo is too late to respond and so over boost, appears to be quite common on these engines,

[Scorpiorefugee]

I had a similar problem a short while ago and it is frustrating to just grope around hoping to find something. From what I can gather the causes are many and varied so it helps if you can get some diagnostic information. I my case, I gat a lot of advice and, while it was all well meant and quite reasonable, none of it actually helped other than to prove what the problem wasn't.

 

I strongly recommend buying or borrowing a VAG com to read the ECU eror codes and parameters.