Turbo Wastegate problem

**bigmikeyoyo** · 19-02-2015,11:14 PM

Hi Guys
After blowing my second intercooler to bits I've spent the day working on the the wifes 02 1.9tdi with 155k on the clock.
Basically ever since I got a friend /mechanic to replace the first intercooler and EGR valve theres been a noise from the engine like a fluttering on changing gear. The turbo actuator is free ok but it has permanant vacuum going to it and so it is permanantly keeping the vanes closed resulting overboost and the car going into limp mode when on boost at about 3000 revs, ignition off and on again it resets itself.
Also theres no vacuum at all going to the EGR valve so its doing nothing at all. Is my n75 faulty, I cleaned the MAP sensor today and the MAF sensor so am ruling these out unless the map is done after the first intercooler blew at 90mph on the M5.
I'm inclined to say the N75 is the culprit but would like to hear any thoughts on the matter.
Thanks in advance
Mike

**Doctle Odd** · 19-02-2015,11:34 PM

I'd say you have sticky vanes no wastegate on an 02 AFAIK Search Google for sticking vanes they can be cleaned fairly easily

**bigmikeyoyo** · 19-02-2015,11:40 PM

Sorry I meant vanes not wastegate, done the mr muscle clean twice in the past 3 days , as I said the actuator rod is moving freely but due to the permanent vacuum to it it is constantly in the up position even when under load it is not operating the vanes to release boost, is the problem therefore not electrical as the n75 should control the vacuum to go on and off when needed instead of having it on all the time as I do

**Doctle Odd** · 19-02-2015,11:44 PM

You need a diagnostic scan mate electrical guesswork won't work

**zollaf** · 20-02-2015,09:47 AM

the way vny works is that it does have a permanet vacuum to it. no vac means no boost. as the boost rises then the n75 reduces the vacuum to control the boost. think of it as working backwards to a wastegate. as doc says, you need a scan to get to the bottom of it, but you also need to know how these things work to be able to fix them.

**bigmikeyoyo** · 20-02-2015,09:58 AM

Why thanks for the helpful replies, scan it is then

**Doctle Odd** · 20-02-2015,10:23 AM

Originally Posted by bigmikeyoyo

Thanks for the patronising reply Zolaf but Perhaps you misunderstood my post, the actuator is having permanent vacuum ALL the time, the N75 is not releasing ANY vacuum on boost which was my point, I know I need to get a scan but as I couldnt last night at 9.30 pm I thought I'd post on here for any ideas, my mistake, off for a scan shortly so no more replies needed thanks

You don't catch flies with vinegar and you don't get free advice from an expert like Zollaf by being rude

**zollaf** · 20-02-2015,10:35 AM

there are 2 L's in zollaf. don't get the hump, i am trying to help you fix your car from a long way off, without knowing you or your car, without having a clue about you mechanical knowledge. to me you don't seem to have a clue what you are doing, what your turbo does or what the parts of it are called, so pardon me for trying to help. and sorry if it came over as being a bit patronising, i will try harder next time to really **** you off.