the computer disconnects the turbo because of over pressure

dardar · Post by **dardar** » Thu Mar 15, 2007 2:54 am

hello you all
its nice to have a place to ask things like that

I replaced a broken shafted turbo with a new part, and with the new one the computer disconnects the turbo because of "over pressure" - only when i push hard on the gas.

what can it be ?

thanks
ron

coke · Post by **coke** » Thu Mar 15, 2007 4:24 pm

Maybe waste gate pressure.. Im assuming it wasn't building boost as well with the old shaft, and now that it is, the computer doesn't know how to react to that.. Im not sure, but I think the 1.9L TDI has an adustable waste gate. You might want to decrease the pressure at which it opens.

dardar · Post by **dardar** » Thu Mar 22, 2007 5:51 pm

tnx for the answer mate

how can I do that ?

CoolAirVw · Post by **CoolAirVw** » Mon Apr 02, 2007 10:15 pm

Watch the video at the end. That is how your actuator rod should move. If its stuck then do the work in the thread.

If your car has VNT turbo then click here.

http://forums.tdiclub.com/showpost.php? ... ostcount=1

dardar · Post by **dardar** » Thu May 24, 2007 5:34 am

thank you very much !

I did exactly what's I did, before seeing your insructions.

the problem is that it is a brand new turbo (installed for about two months), and it was already clogged with carbon.

now I need to figure out why does the engine throw out so much carbon...

thanks again !

ron

MayorDJQ · Post by **MayorDJQ** » Sat Jun 02, 2007 3:44 pm

TDI's do not have a wastegate. They have a VNT, which is a variable pitch turbo that eliminates the wastegate.

wooddashman.com · Post by **wooddashman.com** » Mon Jun 25, 2007 5:49 pm

By the way, my turbo in the 98 jetta that I have does not look the same as in the earlier posted thread. Will that make a difference? Please some suggestions on taking the turbocarger out of the vehicle.

MayorDJQ · Post by **MayorDJQ** » Mon Jun 25, 2007 6:58 pm

My prior statement isn't totally accurate. A4 TDIs have the VNT, but I believe A3s have a wastegate. You'll probably be able to get more specific help on tdiclub.com

CoolAirVw · Post by **CoolAirVw** » Wed Jul 04, 2007 9:27 pm

dardar wrote:..... and it was already clogged with carbon. now I need to figure out why does the engine throw out so much carbon...

Oil fumes not only clog up the manifold but also the VNT.

Add a CCV filter. Might help.
Eliminate EGR. This might be the best fix. (is that even legal?? If not adjust the EGR percentage in VAG COM.)

Make sure turbo doesn't have movement in shaft causing excess oil loss.

Make sure motor isn't worn out causing burning oil.

Driving at low rpms will tend to clogg manifolds and freeze VNT vanes sooner so dont drive it like grandma. Ya got to "Drive it like ya stole it" sometimes to "blow the cobwebs" out of it.

MayorDJQ · Post by **MayorDJQ** » Wed Jul 04, 2007 10:29 pm

If it has a VNT, it doesn't have a wastegate. If it has a wastegate, it doesn't have a VNT.

Have you plugged in a computer to for error codes?

Former VWDieselParts.com Forum

the computer disconnects the turbo because of over pressure

the computer disconnects the turbo because of over pressure

How do I get the Turbo out of the car?