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Model specific boards => Golf mk4 => Golf mk4 TDI => Topic started by: Rmachines on 05 June 2009, 16:14

Title: Help im stumped!
Post by: Rmachines on 05 June 2009, 16:14: My 115 PD MK4 has been going into limp mode when on the dual carriage way...

i got the code
17965 - Charge pressure control : Positive deviation
P1557 - 35 - 10 - - - - Intermittent

I Cleared it and it was fine, didnt go on the dual carriage way since so i left it at that.

the other day i took it out and right from startup it had no power, so i checked the codes and
17965 code as above came up, I know the N57 valve is a problem so i got hold of one with the square connector off an audi, i spliced the connector (presuming it would work the same) and now there are no codes showing but the car still has no power. BUT... Once i hit 3000 rpm it perks up and the turbo kicks a bit.

I then unplugged the N57 sensor and the fault showed up and it went into limp.

So.. The car has no faults now and is NOT in limp mode, but its lacking a lot of power, Is this because the audi valve is diffrent or do i have another problem??

Any help would be great! :smiley:
Title: Re: Help im stumped!
Post by: T_J_G on 05 June 2009, 17:57: Off of Ross-Tech

17965/P1557/005463 - Charge Pressure Control: Positive Deviation
Possible Symptoms

* Reduced power output
* Limp mode

Possible Causes

* Boost Pressure too High
* Hoses/Pipes incorrect connected, disconnected, blocked or leaking
* Charger Pressure Control defective
o VNT (variable nozzle turbo): nozzles stuck
* Solenoid Valve for Boost Pressure Control (N75) defective

Possible Solutions

* Check Hoses/Pipes to/between Components
* Check Solenoid Valve for Boost Pressure Control (N75)
* Check / Clean / Replace Charge Pressure Control
o Check / Clean mechanism for variable nozzles

Maybe replace the N75 with one from VW and check all your boost hoses are in good condition and connected well.
Title: Re: Help im stumped!
Post by: Rmachines on 05 June 2009, 18:07: All boost pipes seem fine, Im not paying the price VW want for a valve, just aint gunna happen atm! But since i have changed the valve the fault has gone so obviously no sensors and finding a fault, its just got massive turbo lag now!

hmmm :undecided:
Title: Re: Help im stumped!
Post by: T_J_G on 05 June 2009, 18:19: Mabe try find someone breaking a TDI 115 or see if any other TDI parts will fit?
Title: Re: Help im stumped!
Post by: Steve_PD on 07 June 2009, 15:01: I was getting the same code and going into limp mode, turned out to be an intercooler pipe was half off, so check all your pipes.
Failing that it may be the variable vains are sticking on your turbo, which means new turbo :cry:
Title: Re: Help im stumped!
Post by: Rmachines on 10 June 2009, 18:46: Im wondering if my turbo has blown to be honnest, its always been a bit whiney

Anyway now there are no fault codes what so ever... all cleared but there is a megger lack of power!!!

Its not in limp mode, no faults found. It seems the turbo will spin up but it feels as if its spinning but no where near enough, it whines a little bit but there is not that high pressure wooshing noise there should be, and with that... no power!

I dont think its the pipe work as there is no hissing noises, i can here the turbo is no longer boosting as it should be.

But the N75 valve is off an audi (square plug) Not the original VW (roundish plug) So could that valve be causing this.... If its very likely i will look into getting a new one.

Otherwise i would rarther save up for a new turbo :cry: :cry:
Title: Re: Help im stumped!
Post by: Steve_PD on 10 June 2009, 19:08: Sounds like the turbos gone :cry: but check the hoses anyway, and a N75 valve is £35 from vw which is alot cheaper than a new turbo.
Hybrid Turbo conversion :evil: :evil: :evil:
Title: Re: Help im stumped!
Post by: Rmachines on 10 June 2009, 19:35: Hm, I would love to go for the conversion but im skint at the moment... hence not being happy :cry:

Its odd it all started with the boost control positive deviation fault... and now i changed the valve all faults have gone... But the power loss has started..

Right i dont know much about how the valve system works but looking at diagrams i have tried to bypass it to see if i have my power back.

Please if some one knows how to bypass it correctly let me know :grin: Anyway i took the two top hoses (vac in and vac out) And connected them together (bypassing the valve totally) So i presume its as if it should be at full boost all the time?!?! But nothing changed ... still no power. It doesnt tell me much as i dont know if thats the correct thing to do but it might tell you something?
Title: Re: Help im stumped!
Post by: Rmachines on 12 June 2009, 11:02: New N75 valve is going on today! I will see how it goes, my local parts dealer said it was £100+ vw is sure enough about £35.00 ... Back to front me thinks. Will keep you updated :smiley:
Title: Re: Help im stumped!
Post by: Rmachines on 12 June 2009, 20:18: Nope :sad: Brand new n75 and no change... no faults

the engine pulls okish once it hits 3000 rpm (which is a fair bit for diesel) but its just not got that torque it should have!

The turbo spins but it sounds slow, it doesnt build up to that high pressure WOOSHSSHH ... just a distant whine ... Any one know what my next step should be :cry:
Title: Re: Help im stumped!
Post by: Steve_PD on 12 June 2009, 20:21: Gutted :cry: sounds like the turbo's gone, dont go to the dealers......£1100 brand new :lipsrsealed:
I'd try to get a second hand one from a breakers or ebay
Title: Re: Help im stumped!
Post by: Rmachines on 13 June 2009, 21:28: :cry:

If its the Variable vein thingy, does that mean the turbo will carry on to work as normal (just slower) for a while? If its going to run ok for now i will wait and see what hybrid goodies my next pay packet might bring... otherwise might just flog it back to the garage.
Title: Re: Help im stumped!
Post by: Rhyso on 14 June 2009, 10:17: Quote from: Rmachines on 13 June 2009, 21:28
:cry:

If its the Variable vein thingy, does that mean the turbo will carry on to work as normal (just slower) for a while? If its going to run ok for now i will wait and see what hybrid goodies my next pay packet might bring... otherwise might just flog it back to the garage.

all you're doing is delaying the inevtiable - what its currently doing is destroying the housing and the vanes

i'd get rid back to the garage :lipsrsealed:
Title: Re: Help im stumped!
Post by: Rmachines on 14 June 2009, 11:01: I cant belive i have had a MK4 for 5 months and it already broken! :grin:

the things only done 90,000 miles, My mk3 TDI has just ticked over 180k and still on stock turbo :shocked:
Title: Re: Help im stumped!
Post by: Rmachines on 14 June 2009, 15:31: Just before i atack my car... Could it be the VNT actuator/pipes to it... ?

Ok i have managed to activate the VNT actuator now by sucking on the pipe... it moves but not as smooth as it should do, So i took some advice and took it out for a real hard ragging!! Its now come to life again... It started pulling really hard so its better but its a bit laggy now, so its not perfect but it pulls hard once i hit 2.5k

I understand the actuator can be changed without a whole new turbo, should i give that a go first? I will change all the pipe work too as some of it is damaged, although nothing is leaking as i sucked into them all and no vac was lost.