Loss Of Power Problem Solved, Then Back Again!

[Juggernort]

Hopefully somebody may have some advice for me.

 

1999 galaxy 1.9tdi. I bought the car 6 months ago with various issues for £400. Have had the issues fixed except the P1550 code, control deviation - intermittent.

 

I've spent a lot of time researching this and found it could be the following;

 

N75 valve faulty

Vac hose from turbo, n75, n18, brake servo

 

I spent some time time changing all vac hoses over the weekend, with the last hose being changed the one on the actuator. This had rubbed considerably against then chassis/bulk head and worn a hole!

 

Bingo!! Swapped the hose over, and all was fixed.

 

The car went like a rocket n the turbo spooled up nicely, the lumpy idle went and the brake pedal no longer went hard on rare occasions.

 

My first outing today was for a 200 mile trip so I thought an ideal time to test run it. All worked perfectly until sitting in traffic n the m25, the engine light came on. What next?!

 

Strangely, the car only suffered from a lumpy idle. The turbo till spooled up, albeit not as well as before, and there was only a marginal loss of power.

 

Once home, I ran vagcom on my laptop and the same fault code came up.

 

Is it likely that the n75 has failed? Would this result in the car not running well but not going into limp mode?

 

I've checked my newly fitted vac pipes and they are all still in place. The only thing I've not changed is the n75.

 

I'm happy to get another n75 but would appreciate anyone's advice!

 

Thanks for reading.

[a18nkd]

hi have you changed the MAF (mass air flow) sensor next to the air box that would cause it to run lumpy just out of curiosity do you get power back if you switch the ignition off then back on? if so try the pipe that leads to the MAP (mass air pressure) inside the E.C.U behind the clocks in the dash there is a thread on here if you need it hope this helps

[Juggernort]

Thanks fr the reply.

 

The MAF was changed as one of the issues with a new part. Hopefully it won't be faulty already!

 

The issue remains even after turning the ignition off which leads me to believe it may be a vac issue or perhaps the n75. I've bought a replacement n75 so will fit that when it arrives.

 

Will check the pipe in the Ecu as you suggest too!

[Juggernort]

Struggling to get the ecu out! My t20 bit just won't fit in the first bracket to enable the catch to move and release the cabling.

 

Frustrated!!

[Juggernort]

ok, ended up buying a new set of tamperproof bits, my t20 was chewed to pieces.

 

ECU taken out, pipe checked and visibly no holes, but it did seem very thin around the inlet jet and split when touched. Its now replaced and all refitted.

 

Codes have been deleted and test drive seemed to indicate full power was restored. No warning light came on either.

 

Im crossing my fingers!

[a18nkd]

hopefully its sorted for you then