rob136
Member
Hi All,
This may be a bit of an essay but I want to get as much info in as possible!
the car is a 2003 mk4 golf pd100 with remap done a year and a half ago (by awesome gti). In the recent months I thought I noticed it occasionally not pulling quite as hard as it should however this was very minor and could well have been just in my head!
I decided to fit an EGR delete pipe (egr already coded out with remap) approx. 2 months ago. at the same time I did the vac simplification using new pipes following the guide http://uk-mkivs.net/topic/50427-pd-vac-line-simplification-n18-n239-valve-delete/. As I planned to go for more power I used a pd130/150 delete pipe and fitted the manifold with it. (bigger than the pd100).
Since then the car has had very little power low down only coming on boost at 2200rpm. in 4 or 5th gear when driving it hard it will go into limp over about 3k rpm. It also throws out quite a lot of black smoke until the boost comes in. MPG has dropped from an average of about 54 to about 45. With the limp mode it throws up fault code
17964 - charge pressure control p1556-35-10 - Negative Deviation - Intermittent.
I have since added a PD130/150 turbo intake pipe MAF and airbox (not to cure the issue but because the 100 does not fit properly with the 130 manifold.) This has obviously not cured the issue although black smoke does seem reduced.
Doing some more diagnosis I found the turbo VNT does not move when checked using basic settings 11 in VCDS. It moves fine b hand and if I take the hose of the n75 I can easily suck the turbo fully open using my mount. (haven't got a vacuum gauge currently the check pressure). I did try blocking the hose with the vnt sucked down and the boost returned (I was carful here not to push the car and cause overboost!).
I tested the resistance of my on n75 valve and it was 16 ohms which after some online research was out of VWs spec of 25 to 35. I brought a new one from darkside and fitted it today and it makes no difference to the car. I did check the resistance and it was 15.6 ohms which got me wondering whether the new n75 is also faulty or whether I have found incorrect info on web or maybe even my ohm meter is faulty (it is only a cheapy maplin one). I have also tried swapping the egr solenoid and again no difference to car.
I have now done a quick log of block no 11 and was wondering if anyone can suggest what to check next to restore power. the duty cycle in the log seems a bit all over the place to me but to be honest this is the first time I have used vcds logs so Im not fully sure yet what they mean!
This may be a bit of an essay but I want to get as much info in as possible!
the car is a 2003 mk4 golf pd100 with remap done a year and a half ago (by awesome gti). In the recent months I thought I noticed it occasionally not pulling quite as hard as it should however this was very minor and could well have been just in my head!
I decided to fit an EGR delete pipe (egr already coded out with remap) approx. 2 months ago. at the same time I did the vac simplification using new pipes following the guide http://uk-mkivs.net/topic/50427-pd-vac-line-simplification-n18-n239-valve-delete/. As I planned to go for more power I used a pd130/150 delete pipe and fitted the manifold with it. (bigger than the pd100).
Since then the car has had very little power low down only coming on boost at 2200rpm. in 4 or 5th gear when driving it hard it will go into limp over about 3k rpm. It also throws out quite a lot of black smoke until the boost comes in. MPG has dropped from an average of about 54 to about 45. With the limp mode it throws up fault code
17964 - charge pressure control p1556-35-10 - Negative Deviation - Intermittent.
I have since added a PD130/150 turbo intake pipe MAF and airbox (not to cure the issue but because the 100 does not fit properly with the 130 manifold.) This has obviously not cured the issue although black smoke does seem reduced.
Doing some more diagnosis I found the turbo VNT does not move when checked using basic settings 11 in VCDS. It moves fine b hand and if I take the hose of the n75 I can easily suck the turbo fully open using my mount. (haven't got a vacuum gauge currently the check pressure). I did try blocking the hose with the vnt sucked down and the boost returned (I was carful here not to push the car and cause overboost!).
I tested the resistance of my on n75 valve and it was 16 ohms which after some online research was out of VWs spec of 25 to 35. I brought a new one from darkside and fitted it today and it makes no difference to the car. I did check the resistance and it was 15.6 ohms which got me wondering whether the new n75 is also faulty or whether I have found incorrect info on web or maybe even my ohm meter is faulty (it is only a cheapy maplin one). I have also tried swapping the egr solenoid and again no difference to car.
I have now done a quick log of block no 11 and was wondering if anyone can suggest what to check next to restore power. the duty cycle in the log seems a bit all over the place to me but to be honest this is the first time I have used vcds logs so Im not fully sure yet what they mean!
