'96 Passat AAZ lacks turbo boost

[erico]

Hi Erico , i have an Golf MK3 GTD , AAZ Engine. When i buy the car , it have disconected both vacuum valve , ( IDLE and WASTEGATE) . I´m not shure what colour cables are for them.
You can email me schematic?
Regards

Hi.
Post a jpg photo of exactly what you are talking about.

You should probably start your own thread. Hijacking a thread is not exactly proper forum protocol.

They are probably disconnected because the system does not work as it should...(i.e bad wastegate or EGR or dead turbocharger).

Does the turbocharger even spool up?

Idle adjustment is done at the diesel injection pump.

On the AAZ turbo...which one do you have? is it the KKK or the Garrett?

I will wait for the photo.

cheers,
Eric

[erico]

this may be relevent, a couple of years ago my 95 AAZ had an intermittent turbo and black smoke. It was caused by a faulty switch on top of the injection pump , not sure what its called but it operates at part throttle. On a light throttle the switch is closed, I dont remember if this is open circuit or not but eather way it controls that air valve and disables the turbo with a vacuum actuator and opens the EGR valve. As soon as you push the throttle past the swtch operating point the EGR closes and the turbo is enabled.
So a temporary cure for me as advised by a diesel specialist was just to disable the system, leaving the EGR valve closed and the turbo always on.
This was achieved by disconnecting the faulty switch and blocking the vacuum pipe that controls the EGR / turbo disable.

The switch is called an EGR Part Throttle Switch.

cheers,
Eric

[josedebanne]

Sorry , is my first post , don´t know exactly to do this.

The turbocharger appears to work well
The turbo is KKK

Both valves are disconnected and the exactly question is what colours of cables are for wich valve , One connector have colours Brown/Black - Black/Yellow. The other has Blue/Red - Black/White.

[Crasher]

What is the vehicle? It looks like an AAZ engine but car and year would help.

[erico]

Sorry , is my first post , don´t know exactly to do this.

The turbocharger appears to work well
The turbo is KKK

Both valves are disconnected and the exactly question is what colours of cables are for wich valve , One connector have colours Brown/Black - Black/Yellow. The other has Blue/Red - Black/White.

I can only make an educated suggestion for you. Your car uses a different wiring configuration than the Passat TDI.

Here is how the 1996 Passatt sedan and variant is set up according to the schematics:

Wastegate Bypass Regulator Valve: Black/Yellow and Brown/Blue

EGR Vacuum regulator solenoid N18 : Black/Yellow and White

So..chances are that the on your car the Blue/Red and Black/white connector is for the EGR Vacuum Regulator solenoid.

The other connector should be for the Wastegate Bypass Regulator Valve on your Turbocharger.

best I can do for you without having the actual manual. What year is your car? You really should have posted this in the Golf TDI section.

[josedebanne]

It's an VW GOLF GTD 1998. AAZ Engine. Made in Mexico
I will search in Golf TDI Section.
Thanks Erico.

[erico]

It's an VW GOLF GTD 1998. AAZ Engine. Made in Mexico
I will search in Golf TDI Section.
Thanks Erico.

You are quite welcome

Regards,
Erico

[the_old_diver]

Hi there,
Sorry this is late but it might help: My '96 Passat TD has an AAZ engine and only one solenoid which activates (= "supplies vacuum") to both the EGR valve and the Wastegate actuator. The solenoid is officially an N18, and has yellow/black and brown/? other dark colour going to the connector on the solenoid.
Cheers, OD