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the computer disconnects the turbo because of over pressure
Posted: Thu Mar 15, 2007 2:54 am
by dardar
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
Posted: Thu Mar 15, 2007 4:24 pm
by coke
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.
Posted: Thu Mar 22, 2007 5:51 pm
by dardar
tnx for the answer mate
how can I do that ?
Posted: Mon Apr 02, 2007 10:15 pm
by CoolAirVw
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
Posted: Thu May 24, 2007 5:34 am
by dardar
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
Posted: Sat Jun 02, 2007 3:44 pm
by MayorDJQ
TDI's do not have a wastegate. They have a VNT, which is a variable pitch turbo that eliminates the wastegate.
How do I get the Turbo out of the car?
Posted: Mon Jun 25, 2007 5:49 pm
by wooddashman.com
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.
Posted: Mon Jun 25, 2007 6:58 pm
by MayorDJQ
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
Posted: Wed Jul 04, 2007 9:27 pm
by CoolAirVw
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.
Posted: Wed Jul 04, 2007 10:29 pm
by MayorDJQ
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?