Help! - I've lost boost and the car's making a dump valve sound

Xez said:
Might be worth getting a forge 007 recirc valve if proving hard to find. I'd imagine that they fit and doesn't make silly noises!
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Thanks but it seems the Forge part requires lubrication every so often and costs an extra £90!

paradigm said:
I've got a plastic re-circ from a Cupra R you can have if you get desperate.
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Thanks for the offer :) I know where to get one now so Ill order a new one.

hominid said:
http://www.awesome-gti.co.uk/product.php?xProd=13242&xSec=151

or

http://www.jkm.org.uk/performance/tfsidiverters.htm

I got mine from awesome, next day delivery although it was a bit cheaper a few months back.
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Thanks!! I have ordered one from Awesome! :)
 
Thanks for all the help guys! The part arrived today from Awesome (excellent service!) and I drove around all the garages I knew in Bham to have it fitted. Finally found one that had the time of day to do it for me, although the engine was hot (tip: always leave the car to cool for 1 hour before attempting, its hot in there!!).

For all those thinking of doing it themselves on a MK5 GTi (200PS) I would not recommend it. The valve sits behind the plastic tray and access if very limited. Without a ramp it would have been ultra difficult!

The good news is the car is cured! Instant turbo response and pulling like a train again, truly awesome!
 
Ive had a strange problem over the last 2 weeks. 2 episodes, each on the motorway where basically the car has lost all boost. Flooring the throttle has made little difference at 70 mph. Each time turning the car off, taking the key out of the ignition and restarting has cured the problem! Any ideas of what it could be, throttle body perhaps?
 
Type_R said:
Ive had a strange problem over the last 2 weeks. 2 episodes, each on the motorway where basically the car has lost all boost. Flooring the throttle has made little difference at 70 mph. Each time turning the car off, taking the key out of the ignition and restarting has cured the problem! Any ideas of what it could be, throttle body perhaps?
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You have probaly got a boost leak somewhere and the ECU is putting the engine into limp mode to protect the turbo. Best bet is to get the car scanned for fault codes which will be recorded each time the engine goes into limp home mode.
 
I just had the car scanned with VAGCOM. It came up with the following errors:

1. 16618 P0234 Turbocharger Overboost Condition Control limit exceeded

2. Manifold intake condition (not really sure what the exact code was)

3. Voltage Reference 'A' code (again not sure what the exact code was)

All came up as sporadic. The VW independent guy had never seen the last two codes, so he has cleared them and wants me to drive it and see if I experience turbo limp again. If I do then he will check the hose pipes.
 
number 2 could be intake flap motor on its way out the exact code would be able to pinpoint this. This wouldn't cause limp mode and if it had failed it would have put on the engine managment light. It is a cheap part however a pain to replace.

The first fault is what caused the limp mode could be caused by a lot of faults including boost leaks or as Paradigm mentioned the n75 valve/ pipework to/from it.

Here is the information for the fault code from VCDS/Vagcom


16618/P0234/000564 - Boost Pressure Regulation: Limit Exceeded (Overboost Condition)
Possible Symptoms

* Boost pressure too high
* Reduced power output

Possible Causes

* Hoses incorrect connected, disconnected, blocked or leaking
* Malfunction N75

Possible Solutions

* Check charge pressure control
* Check Solenoid Valve for Boost Pressure Control (N75)
 
I had the exact same issue on my old Golf TDi, the N75 (or boost control valve) had gone and it was putting too much boost into it. The ECU panics and put it into limp home.

It did it on my olf FRST but that way cause of the uprated actuator.

My money is on the N75
 
Reading on the golfmkv forums seems it is relatively rare for a MK5 N75 valve to blow (yes apparently they do have one and is known as the wastegate valve!). Plus it would show up as a wastegate fault on VAGCOM. It looks like a mission to change as well!

I guess perhaps the remap has caused a pipe to come loose and cause pressure leaks. I will see how I go otherwise book it in for a pressure leak test.
 
I wonder whether my MK5 TDI has this as well. I've noticed a little loss of power, dump valve type noises and on occasion especially when cold, it seems to go into limp mode until it warms up
 
Quite the cocky one... I guess reading logically wouldn't go amiss :)

Anyway, back to the thread instead of trying to make yourself look less stupid perchance?
 
Type_R said:
I just had the car scanned with VAGCOM. It came up with the following errors:

1. 16618 P0234 Turbocharger Overboost Condition Control limit exceeded

2. Manifold intake condition (not really sure what the exact code was)

3. Voltage Reference 'A' code (again not sure what the exact code was)

All came up as sporadic. The VW independent guy had never seen the last two codes, so he has cleared them and wants me to drive it and see if I experience turbo limp again. If I do then he will check the hose pipes.
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I just had the codes 2 & 3 on with the EML on my Golf it appears this is a common fault with the intake manifold motor which controls flaps in the intake manifold for lower emissions. I suspect the full codes you had were

012599 - Intake Manifold Runner Control: Basic Setting not Completed
P3137 - 001 - Upper Limit Exceeded - Intermittent

001602 - Sensor Reference Voltage A: Circuit: Low
P0642 - 002 - Lower Limit Exceeded - Intermittent


You need to get the garage to do the following with VAGCOM/VCDS

Intake Manifold Runner
Prerequisites:


Ignition ON
Engine OFF
System voltage at least 11.0 V.


[Select]
[01 - Engine]
[Basic Settings - 04]
Group 142
[Go!]
Activate the Basic Setting.
[ON/OFF/Next]
Wait until Field 4 shows "ADP. O.K.".
[Done, Go Back]
[Close Controller, Go Back - 06]



Switch Ignition OFF for at least 60 seconds.

This should resolve the issue that caused your bottom 2 fault codes, if it doesn't work it will need to new motor/sensor (it is one part). I just carried out the adapation on mine along with the throttle body and it has improved the low down responses which I had noticed recently seemed slightly sluggish.
 
Dangerous Dave said:
I just had the codes 2 & 3 on with the EML on my Golf it appears this is a common fault with the intake manifold motor which controls flaps in the intake manifold for lower emissions. I suspect the full codes you had were

012599 - Intake Manifold Runner Control: Basic Setting not Completed
P3137 - 001 - Upper Limit Exceeded - Intermittent

001602 - Sensor Reference Voltage A: Circuit: Low
P0642 - 002 - Lower Limit Exceeded - Intermittent


You need to get the garage to do the following with VAGCOM/VCDS

Intake Manifold Runner
Prerequisites:


Ignition ON
Engine OFF
System voltage at least 11.0 V.


[Select]
[01 - Engine]
[Basic Settings - 04]
Group 142
[Go!]
Activate the Basic Setting.
[ON/OFF/Next]
Wait until Field 4 shows "ADP. O.K.".
[Done, Go Back]
[Close Controller, Go Back - 06]



Switch Ignition OFF for at least 60 seconds.

This should resolve the issue that caused your bottom 2 fault codes, if it doesn't work it will need to new motor/sensor (it is one part). I just carried out the adapation on mine along with the throttle body and it has improved the low down responses which I had noticed recently seemed slightly sluggish.
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Thanks this is superb!! Your a legend! I will get that done and see what comes of it! :D
 
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