Not Audi but VAG passat 1.9 tdi 130 2004

[Monkeymagic]

vANES STUCK WILL NOT CAUSE THIS IT WILL CAUSE OVERBOOST CODE 17965

[Monkeymagic]

Vacuum line from egr to valve shot .. Or diaphram in egr valve weak or blown.. There is a vac test for the egr diaphram.. Good lucK
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[K7ERG]

It I put a egr blank plates that should eliminate the egr valve?
Will check lines

[K7ERG]

Put the Egr blank plates on this afternoon. No difference maybe even worse. The actuator valve on the throttle body is the only thing that stops the back pressure but if manually moved can stall the engine. Very thin line between sound like it's running right and stalling.

Starting to p1$h me off now.

Any other ideas?

[K7ERG]

Anyone?

[Monkeymagic]

Run a comp test. Id gladly help however its along long way etc....

[K7ERG]

Sure is lol.

Thanks for your help.

[Monkeymagic]

Ive been thinking about this. The EGR and throttle valve are one piece although do two distinct different jobs. the throttle valve should open all the time except for when you first shut the engine down when it closes temporarily to stop diesel run on. That flap is controlled by the plastic diaphragm and connecting rod.
The egr works as a plunger that is drawn up via a vacuum pipe on the metal space ship part on top. the vacuum for this is regulated by the N18 valve.

To my mind if you are getting positive pressure coming back from the throttle valve once the pipes to the intercooler are disconnected then the exhaust valve(s) are not sealing allowing gases to come back.

[Monkeymagic]

Just though where did you blank the egr. From the pipe from manifold to the egr itself.??
Have you checked the egr with a mityvac to ensure its opens and then srpings shut under the spring.
I guess if it were open you may get some positive pressure from exhaust causing the noise and would choke the car making the MPG poor.

[K7ERG]

Not got access to a mityvac to check. It is giving poor mpg.
Someone else said to check timing.

If u could get a hold of another Egr valve I would like to try that first. Can't find any in my local scrappys.

[Monkeymagic]

The timing is very simple line up the flywheel mark on bell.housing then insert 8 mm bit through window in cam that skots into head. There is a trigger wheel on cam.pulley one of them with two prongs will align with pointer on plastic cover on head thats marked 4z. If timing were out it would throw a fault. Therearecorrect tools to lock crank and cam but they are simple if you dont have access,.
Egr from pierburg is cheap enough as i recall

[Monkeymagic]

Thinking about it its about a 5mm bit.