Rustynuts Posted May 17, 2005 Report Share Posted May 17, 2005 [ QUOTE ] It Is caused by the turbo over boosting and cutting out,not to blow the engine. It is caused by the waste gate not opening. [/ QUOTE ] And this is a real blinding good reason not to trust VW dealers with your motor. There is no wastegate on his engine. What have you been learning for 4 years? Link to comment Share on other sites More sharing options...
mulkbear Posted May 17, 2005 Report Share Posted May 17, 2005 there is a wastegate as such but it is fitted inside the turbo, if there is no waste gate how will the over pressure be dumped SO TAKE YOU FACE FOR A SH#T p.s 4 years of ripping off vw owners Link to comment Share on other sites More sharing options...
Rustynuts Posted May 17, 2005 Report Share Posted May 17, 2005 Typical Dealer response. You'll make it to service manager. Link to comment Share on other sites More sharing options...
wetcornflake Posted May 17, 2005 Report Share Posted May 17, 2005 I thought the mk 4 tdi didnt have a wastgate thought the pressure was controled by the VNT mechanism controlled by so called n75 valve. that isnt actually called the n75 on the mk4. if its had a new turbo as informed my monies on the MAP sensor. Link to comment Share on other sites More sharing options...
Rustynuts Posted May 17, 2005 Report Share Posted May 17, 2005 That's exactly how the VNT turbo works. Boost pressure is controlled by the ECU, not a wastegate, which is why the boost returns when the engine is turned off and back on. A wastegate would stay stuck! Link to comment Share on other sites More sharing options...
Wobby Posted May 17, 2005 Report Share Posted May 17, 2005 What dealer does he work for?? he needs the sack !! Link to comment Share on other sites More sharing options...
Skidmark Posted May 17, 2005 Report Share Posted May 17, 2005 Is this a 'wind-up'......it's getting people going !!! just a thought Link to comment Share on other sites More sharing options...
RNewman Posted May 18, 2005 Report Share Posted May 18, 2005 My New Beetle, 52 reg 55,000. Same Problem at 2500 revs usually when in 5th gear goes limp. At this exact moment is having dianostics at vw garage, thanks to advice from wetcornflake. I'm dreading what they are going to say! I bet it's 'sorry sir new turbo' and i've got no warranty! I will let you know what they say. thanks in advance Link to comment Share on other sites More sharing options...
Wobby Posted May 18, 2005 Report Share Posted May 18, 2005 AM NOT MAD !!!! Your from Wales, you can't say anything Link to comment Share on other sites More sharing options...
taylorpjames Posted May 20, 2005 Report Share Posted May 20, 2005 Thanks to wetcornflake for the helpful advice - I have got my golf booked into to the dealer (lightcliffe who you may know being from the bradford area) and I will be interested to see what the VAG COM reports. For anyone who is interested and has access there is a really good article in the technical forum of Volkswagen Driver magazine (issue 60 May 05) by Andrew Chapple (volkswizard) which is exactly about this problem. In his article the 'cure' was to extend the mechanical linkage (that controlled by the N75 valve) on the turbo which alters the position of the vanes. By lengthening the linkage the rate at which boost pressure rises is reduced. Will let you know the outcome when fault diagnosed. Link to comment Share on other sites More sharing options...
Rustynuts Posted May 20, 2005 Report Share Posted May 20, 2005 Be sure and mention that VW techs in Newcastle suggest that the wastegate is stuck. Watch the look on their faces. Link to comment Share on other sites More sharing options...
wetcornflake Posted May 21, 2005 Report Share Posted May 21, 2005 Altering the linkage on the VNT mechanism is only a bodge, when you have a turbo repaired or serviced, when completed, it has to be properly callibrated. It has to be mounted in its own manifold on a test rig, (If you buy new VW turbo comes with manifold)it is run up to diffrering speed, and the output set to pre set pressures by adjusting the VNT mechanism, the pre sets are to conform with the different engine management chips. This susequently gives you greater engine life and is the whole point of the chip putting your engine into Limp mode. You may on the other hand be a boy racer and wish to tweek and tune your engine, In this case carry on and good luck. Link to comment Share on other sites More sharing options...
taylorpjames Posted May 23, 2005 Report Share Posted May 23, 2005 just got back from VW dealer and have the following points: 1) they don't use VAG COM - when asked why the tech said they are not allowed to use it. Obviously they use an equivalent system but isn't VAG COM a VW/Audi endorsed or indeed derived product? 2) Fault not there on my golf now (always the case isn't it) but the ECU had recorded the defect as sporadic charge pressure controll fault. Just to test the car I opened it up on an clear bit of uphill and wow the turbo kept going all the way! Car is booked back in so that they can carry out more tests when i can leave the car with them. The technician suggested that the VNT mechanism can sieze when hot thus triggering limp mode and that he has known turbos less than a year old fail. Oh by the way I am no 'boy racer' and would never do anything bodged to damage my beloved Golf. Link to comment Share on other sites More sharing options...
wetcornflake Posted May 23, 2005 Report Share Posted May 23, 2005 Hi glad to hear your making progress But you could run into probs if your not using Vag Com tester. The Vag Com system has an accessory that plugs in to test all the wiring to the componants that relay info to the Chip this was the problem I had. If your are in Bradford go to Dixon VW on Canal Road They are gen'd up. most non vw garages take them there for diagnostics and they dont rob you. I did same as you tried 2 non VW garages first. might as well have thrown my money down drain. allas not all VW agents are that good As a matter of interest what was the fault code they came up with Link to comment Share on other sites More sharing options...
taylorpjames Posted May 24, 2005 Report Share Posted May 24, 2005 Thats why I thought it was strange why they didn't use VAG COM as they are an approved main VW dealer. They use a system called VAS (then some numbers after it like 1851 which I assume the the version no.) There was no fault code on the printout the tech showed me but it described the fault as "sporadic charge pressure control fault". He also said that the turbo has a two year warrenty and that as mine is just over two years old then there may be some good will gesture. I hope so as the part price alone last time was £788!! Incidently later on that day on my way home from work engined limped when overtaking on the motorway! Stupid of me to think the fault had gone away but it does raise the point that this is a potentially dangerous situation. Link to comment Share on other sites More sharing options...
wetcornflake Posted May 24, 2005 Report Share Posted May 24, 2005 Hi just a thought there's a chap in blackpool repairs turbo's turborepairs.com Tel. 01253 407646 He did one for me, He arranges pickup of yours one day, recons it the following day, you have it delivered back the 3rd day he did one for me £195.00 inc VAT, Pick up and re delivery, and gives a 12 months return to base warranty. Dont forget Turbo needs to be still on Ex. manifold Link to comment Share on other sites More sharing options...
shades44 Posted May 29, 2005 Report Share Posted May 29, 2005 help golf tdi x plate had new air flow meter now its sat for a day and seems 2 have no turbo power although a turbo noise can still be heard faintly car drives ok just no kick. mate put on his snap on machine and the folowning code appeared turbo pressure control 17964 (control limit below minimal) p1556 (error occurs intermitting) any help b4 i take to the local auto man would be great thanks neil [email protected] Link to comment Share on other sites More sharing options...
taylorpjames Posted June 24, 2005 Report Share Posted June 24, 2005 just a quick note to update this thread. I have been informed by the main dealer that my golf needs a new turbo - apparently they tried the MAP sensor first then the N75 valve before concluding that the turbo itself was faulty. They then proceeded to tell me that as the previosly renewed turbo was out of its 2 year warrenty (only by a couple of months) then i would have to pay for the replacement £900 please! Not happy with this i phoned VW customer care who were very helpful and given my circumstances (ie 2nd turbo only 2yr old and 15k miles) they agreed to pay 50% of the bill. Whilst I am not happy with a second turbo failing the good will gesture by VW has softened the blow. Moral of the story? anyone who does not like what the dealer tells them and have a genuine grievance then contact VW customer care (number on VW webpage) - after all they are there to help. Many thanks to all the help from contributers on this site (esp Wetcornflake). I had a much stronger argument with the knowledge I gleamed from this site. Link to comment Share on other sites More sharing options...
Luc Posted June 25, 2005 Report Share Posted June 25, 2005 Hey guys I'm also new to the forums. I see that you're talking a lot about the Golf 4 here, so i thought I'd add one more question. I own a TDI, and since I'm not happy with the power it makes, I'd like to install a better turbo. Does anyone know how much boost the STOCK turbo runs? That would help me make my decision better. Thank you! Link to comment Share on other sites More sharing options...
Rustynuts Posted June 25, 2005 Report Share Posted June 25, 2005 What TDI do you own? This dictates which turbo you have at the moment. There's always a bit of slack available in the turbo which can be used by increasing fuelling and boost pressure to give you more power. Bigger turbo wouldn't be first on my list for more power. Edit. Also, start your own thread with a question like this, rather than joining someone elses with an unrelated issue. Link to comment Share on other sites More sharing options...
Luc Posted June 27, 2005 Report Share Posted June 27, 2005 I have the 1.9 TDI with 110 horsepower. Have any idea how much boost it runs? I need some numbers. I appreciate it a lot! Link to comment Share on other sites More sharing options...
dmajohnson Posted July 25, 2005 Report Share Posted July 25, 2005 Just for the record, GSF Car parts sell an after market MAF sensor for £37.50 + VAT. I suspect mine is faulty and I'm sticking one of these in to check. Link to comment Share on other sites More sharing options...
scott19473 Posted July 28, 2005 Report Share Posted July 28, 2005 Help,2001 Golf TDI 90, going in to limp mode when hot and putting foot down in third or fourth gear, Had fault code read and given this info: Charge pressure control: Regulating limit surpassed, Sporadic fault. Any advice? Link to comment Share on other sites More sharing options...
HELENMARVELLEY Posted September 21, 2006 Report Share Posted September 21, 2006 hi im new and a woman which doesn't help ha my golf mk4 has the same prob but i have search all vw garages for a N75 valve, but they all say never heard of one. where would i get one Link to comment Share on other sites More sharing options...
Rustynuts Posted September 21, 2006 Report Share Posted September 21, 2006 The part number for the N75 valve (which the dealers may know as a "pressure converter") is either 1H0 906 627 or 1J0 906 627 depending on the age and vin of the car. Armed with this info, the dealer should be able to find what you want. Here's a picture of one. Link to comment Share on other sites More sharing options...
Recommended Posts
Please sign in to comment
You will be able to leave a comment after signing in
Sign In Now