Hello to all of you!!!

I am new here so will be as quick as possible.... pls be patient

My 07 Skoda octavia BKD 2.0TDI has encountered a problem with the famous P0299 fault.

Quick recap, the turbo has been replaced and is now fitted with a stock (reco) turbo. Before the change i had overboost condition so tried the Mr muscle trick and it didnt work. Garage said that i had coolant leaking into the intake and had siezed parts of VNT mechanism ( i saw the old turbo and it did have some white marks so its either coolant or maybe the mr muscle??)

I am losing coolant aswell with no external leaks, so internal somewere - but have been losing it since i bought the car 3 yrs ago.

So back to the boost issue, 1st and 2nd gear pulls ok (not great) and then in 3rd hits limp mode at higher rpm, no engine light. If i drive it in limp mode it pulls like crap up until 2000rpm then for a brief second it pulls and then backs of again - when it backs off a whine, spool sound is heard, as if all the pressure that was built gets pushed out somewhere.

Diagnostics says requested 2000 mbar but im only making 1800 - hence the underboost.

So far changed : MAF, MAP, EGR cooler, EGR valve cleaned and vacuum checked, Turbo actuator new and tested, Vacuum lines hold vacuum. Ive visually checked the intake pipes and they seem ok, yet to do boost leak test.

To add - my tandem pump was leaking where it connects to the head

so i just changed the gasket, no more leaks but maybe internally an issue. I dont know how or if its related.

I apologise for the lengthy post but im sure ill get more answers here than from the "mechanics" where i am - customer service is something they dont quite understand

Thanks guys

??? Anybody???

Where did you get the recon turbo from? It might be set incorrectly. Can you provide full boost log?

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I got it from a respected company who only do turbos and are positive that the turbo is ok, of course there is always the chance that its not but thats why i would like check everything first before i go to them.

Boost logs i can try and get - jus need to persuade someone here to do it for me..

Tks