dan666 Posted March 22, 2011 Report Share Posted March 22, 2011 need help ive an 01 b6 a4 1.9 tdi 130bhp awx engine code ill explain this as best as i can. it started off when i tried to rev over 3k rpm it was hesitating and just not picking up speed the way it should and has gradually got worst the car goes into limp mode at around 60 mph ive cleaned out the egr valve and inlet manifold, replaced all vac pipes, disconnected the maf sensor ( this just made it worst so ive re connected it) i had my brother in the car reving it whilst i checked the intercooler pipes i noticed when i brother was reving the car up the pipe coming from the intercooler to the egr valve was building pressure and sliding out a bit but then i disconnected the map sensor and it stopped building the pressure and was still dead so ive now reconnected it.i also checked the rod at the back of the n75 vave for movement its moving freely with a pair of pliars.theres no whistling from the turbo or smoke coming from the car has anyone any ideas of what else could cause this all help greatly appreciated thanks dan. Link to comment Share on other sites More sharing options...
drpellypo Posted March 22, 2011 Report Share Posted March 22, 2011 Could be your actual n75 valve. It's a rare part to fail but it does happen. Link to comment Share on other sites More sharing options...
dan666 Posted March 22, 2011 Author Report Share Posted March 22, 2011 is there anyway of testing the n75 valve? Link to comment Share on other sites More sharing options...
drpellypo Posted March 22, 2011 Report Share Posted March 22, 2011 Put the car on VCDS. If it comes up with manifold pressure exceeded it points to either dodgy N75 or a Sooted up turbo. I'm sure there will be a friendly forum member local to you with VCDS. Link to comment Share on other sites More sharing options...
dan666 Posted March 22, 2011 Author Report Share Posted March 22, 2011 well im from belfast northern ireland is there anyone local to me than can do this? the egr valve wasnt in bad shape but the inlet manifold was really badly bunged up its as good as new now but still no difference. has anyone got a guide to removing the turbo and whats best to clean it out with? Link to comment Share on other sites More sharing options...
TIDYDUBS Posted March 22, 2011 Report Share Posted March 22, 2011 Hi there well it sounds like your map sensor is not working properly or the N75.You need to checkthe vacuum part of the variable vane actuator with a mity vac(vac tester) to see if it is A: moving at all B: moves all the way to the end of its travel Very freely not sticking pliers is by no means a test! C: When releasing it it should move back all the way smoothly. Vag Com checking map sensor readings at just ignition on engine NOT running.the specified is 1009 and the actual should tally if you know what you are looking at. Check my other VW posts on Variable Geometry turbos as the principles are the same. Sooting up using crap fuel and piss poor quality oil do them no favours. Innotec turbo clean may help not used it, check their website.Personally strip and clean myself with 100% success so far. Link to comment Share on other sites More sharing options...
dan666 Posted March 22, 2011 Author Report Share Posted March 22, 2011 im going to get it plugged in tomorrow the rod moves freely with pliars and moves all the way back freely im thinking its the map sensor hoping anyway lol Link to comment Share on other sites More sharing options...
roberto1954 Posted March 23, 2011 Report Share Posted March 23, 2011 i had this on a 2001 A6 2.5tdi the turbo was gone but it might not be that Link to comment Share on other sites More sharing options...
cruiser647 Posted March 24, 2011 Report Share Posted March 24, 2011 Have you changed the MAF? Link to comment Share on other sites More sharing options...
drpellypo Posted March 24, 2011 Report Share Posted March 24, 2011 Check the intercooler. It could have popped a seal. Link to comment Share on other sites More sharing options...
dan666 Posted April 5, 2011 Author Report Share Posted April 5, 2011 what way would i check the intercooler? didnt try a new maf because when i disconnect it the problem gets worst i was told if it was the maf it would stay the same or get better? Link to comment Share on other sites More sharing options...
dan666 Posted April 5, 2011 Author Report Share Posted April 5, 2011 ive now removed the turbo and cleaned it out all put back together now and its still the same ive ordered a new bosch map sensor so hopefully this sorts it. Link to comment Share on other sites More sharing options...
Audi A4 berkshire Posted May 12, 2012 Report Share Posted May 12, 2012 ive now removed the turbo and cleaned it out all put back together now and its still the same ive ordered a new bosch map sensor so hopefully this sorts it. Hi there my name its claudio and i ve got the same problem in my a4 1.9 tdi . can you helpe me did you change the map sensor did it worked ? Link to comment Share on other sites More sharing options...
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