Tdi flat spot / hesitation

[imperial21]

I get this problem around 2500 rpm , i get this fault when i am accelerating up a hill or having to pull away quickly at a junction.

Sometimes it feels like the engine is dieing for a second.

Yesterday i was driving and this happened, I was going up a steep hill i could here the usual sound of the turbo then when the problem occured it made a sound like a hoover when you put your hand over the end, It only does the problem for a moment as usually i back the throttle of and then it fine again ?

I usually drive the car around town quite a bit, i drive quite calmly with fuel econommy in mind !

I have asked about this fault before and the temp sensor was suggested which i have changed.

I have put forte turbo cleaner & injector through the sysytem, Personaly i think the fault is slowly getting worse.

I am not getting any lights on the dash.

[imperial21]

I have had the ecu read tonight and it had fault code 17965 which i believe means Charge Pressure Control: Positive Deviation ?

Does this i have stick vains on my turbo ?

How quickly do the vains get carboned up ?

[mbames]

Quite possibly stick vanes. If you catch it early enough, you might find an Italian tune up (or 10) will do the trick.

Otherwise try manually exercising the actuator on the turbo to move the vanes, it should move smooth and quietly.

[imperial21]

I was thinking of doing the mr musscle treatment to the car as i thought that would help sort it ?

[mbames]

Mr Muscle won't do any harm - for it to work, you need to move the actuator through its full travel (the more times the better).

[Sheldon.Cooper]

The problem with carbon getting on the vnt vanes is that you cannot do anything from 'outside' the turbo, the gumming up happens inside. You can exercise the mechanism which may help short term. An Italian tune up (or several) as previously suggested will also help but not totally cure it.

I've used 10K boost in the past which worked perfectly if you follow the instructions to the letter. I've also had turbos taken off and soaked in petrol overnight which fixed the problem fully.

Do not treat VAG TDI PD engines with kid gloves, drive them gently and they will reward you with stuck turbo vnt vanes, they need to be worked hard quite often to keep them clean.

[imperial21]

Which 10k boost product do you recomend ? Do the turbos get carbon in them very quick ?

Is there anyone local to me in Dorset who could assist with doing the mr musscle job please ?

[trundlenut]

The problem with carbon getting on the vnt vanes is that you cannot do anything from 'outside' the turbo, the gumming up happens inside. You can exercise the mechanism which may help short term. An Italian tune up (or several) as previously suggested will also help but not totally cure it.

I've used 10K boost in the past which worked perfectly if you follow the instructions to the letter. I've also had turbos taken off and soaked in petrol overnight which fixed the problem fully.

Do not treat VAG TDI PD engines with kid gloves, drive them gently and they will reward you with stuck turbo vnt vanes, they need to be worked hard quite often to keep them clean.

The Mr muscle approach is not outside the turbo, your spraying it directly into the exhaust side of the turbo. Also the injection pump engines seem to be more prone than the pd engines.

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[kevberlin]

Should you be unfortunate to need it, The Turbo Centre is excellent and gives great service. Good luck.

http://www.turbocentreuk.co.uk/

I had the same problem on my Mk 1 Octy.

Edited 12 June, 2013 by kevberlin

[imperial21]

While driving the car tonight, i tried to give it a bit more stick and i found it would nr rev past 3k ???

[trundlenut]

While driving the car tonight, i tried to give it a bit more stick and i found it would nr rev past 3k ???

Liiiiiiiiiiiiiiiiiimp mode

It's annoying.

[imperial21]

It clears quite quickly, So i guess this is more pointers towards the turbo vains sticking ?

[trundlenut]

It clears quite quickly, So i guess this is more pointers towards the turbo vains sticking ?

Did you have to cycle the ignition to go back to normal? If not then it won't be limp mode.

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[imperial21]

No just let the throttle off, then tried again 10 secs later and it would pull but i dont think as well as normal, I am torn between doing the mr muscle treatment or the innotec ???

[trundlenut]

No just let the throttle off, then tried again 10 secs later and it would pull but i dont think as well as normal, I am torn between doing the mr muscle treatment or the innotec ???

That shouldn't be limp mode, so you may not have an issue with the turbo. Worth getting the car scanned for fault codes. Could be something like the maf.

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[mbames]

vacuum leak or some sensor failing. This isn't standard symptoms of sticky vanes. As above you need to get fault codes read.

[imperial21]

The ecu was read tuesday night thats when i got ecu read and it had fault code 17965.

[trundlenut]

The ecu was read tuesday night thats when i got ecu read and it had fault code 17965.

That is an over boost fault which you typically get with sticky vanes but the doesn't seem to be going into limp mode. I assume they cleared the fault, you need to see if it comes back. That could could have been logged once and just been sitting there.

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[imperial21]

I will buy my own fault reader so i can check again, i am looking at this one

http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&item=161043764447&ssPageName=ADME:B:BOC:GB:1123

which will hopefully do what i want, I will eventualy probably get a good vcds to put on my computer.

[imperial21]

Hi All

My code reader has arrived now, I got the one in my previous post, The results are as follows :

Any ideas ?? Have i got sticky vains on my turbo ?

[trundlenut]

Maybe, or the map sensor is duff and confusing the ECU.

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[mbames]

May car would sometimes hang back and then be ok the next time I requested power, so this might be the early onset of sticky vanes.

I would start by checking to see if the actuator on the turbo moved smoothy, and then after that consider the MAF, MAP and CTS along with vacuum issues.

[imperial21]

I personaly think mbames could be right, Thats why i am thinking it could be mr muscle time ?

I have noticed another strange happening, When the car is hot and i start it again quite soon after a run, It will stall then i start again and its like its running on 2 or 3 cylinder makes terrible noises, I will quickly turn off then on again and its like nothing was wrong ????

[mbames]

Mr Muscle won't do any harm - check to see how the actuator on the turbo moves before hand though.

what colour is the exhaust is the exhaust while it sound really rough?

[imperial21]

It wont run long when its rough, I will check the activator how easy is it to get at ?