Hello guys

Today I had a very strange issue when started my car in the morning...

First I noticed a power loss - no matter how hard I throttle it did not accelerate and some strange noise was coming form the from, like something was hardly scrabbling... Then I came to the little hill near my home, car did not want to go uphill like no power to go and the engine just turned of... Tried starting it again and it just would not start... After 2 or 3 tries it started but still no power to go uphill and the engine was shaking... Then I turned it off and disconnected the N75 connector and then car started working fine and running fine... Also there was a light grey smoke when I started it with the N75 disconnected and it was very short. Now car ran fine but going to limp mode when I try to push it over 2500 rpm.

 

My turbo has recently been cleaned by mr muscle trick and the actuator was replaces about 3-4000km ago...

Also recently I am having boot issues. when I boot it I can hear a wind-like noise form the right side (my car is LHD) and I feel power loss when this noise comes. When rpm reaches above 2100-2200 this noise seem to be gone and very very hardly is noticeable. I thought this was a boost leak and the intercooler was first suspect, took of the IC and it was refurbished by professional and it does not leak now, there was one very small leak. Unfortunately this wind-like noise remained. I just hope it is not a turbo. I tested vanes and a was able to move it up and down. Also I tested the actuator (the new one, I thought it gone dead too) like shown in video below and it moves just fine (as in this video with no glitches, smooth as butter).

 

 

Any advice is welcome...

Edited 30 April, 201511 yr by Arminator

A little update...

Today  I got limp mode: 130KM/h, 4th gear at 3500rpm. After restarting the car limp mode was gone...

Read codes and I got P1550... Then after that I did log for two short rides which you can find attached below. A good analysis is welcome.

I really did not have time to test by swapping N75 and N18... That is what I am going to try next...

LOG-01-010-011-xxx.CSV

LOG-01-011-010-xxx.CSV

Edited 2 May, 201511 yr by Arminator

HI again...

 

One more update... I did readings this morning after cold start, and then when engine was hot on straight road... Please find attached readings from block 010 and 011...

 

Also I thought these more representative so I have chosen these part...

 

Thanx in advance for any help given.

Anyone to give an advice?

I have solved my problem...

Unfortunately, the turbine gave up (at 254k km)... It did not produce any strange noise under load but only when engine goes from high load to idle (from high RPM suddenly to low RPM)... It was hard to notice...

Anyway I got my turbo refurbished and now it runs like a champ.