No boost

[golfmajster]

Hello everyone I drive a 2005 vw golf 5 1.9tdi 77kw. When I bought this car it already came with problems but now when I first start the car after turning it off it has no boost the turbo won't work. My friend tought me that when driving you can quickly turn the key to off on position and then it starts to get boost and work. On the guage cluster it says emissions workshop what could be the problem with the power loss issue? Egr, leaking air or just the broken turbo ?, Also last time when I was changing my oil I saw that there was oil everywhere on the back of the engine and I believe that some hoses that were not supposed to be filled with oil were filled with oil. What should I do, and what are my options ? If someone could help me.

 

[JETaah]

I am at a loss as to which engine you have (BJB, BKC?) and how it is equipped but, it seems as though this would have left a fault code in the ECU's memory.
Getting the fault codes read would be a good place to start.
Turbo issues could stem from a turbo actuator that has a bad vacuum diaphragm. Works sometimes and not other times.
Oil on the back could be from a leaking valve cover gasket, a loose intake manifold,...a number of things beside a hose that got detached or partially detached.

 

[BobnOH]

The workshop light means there are codes. Helpful to read those.
The oil leak needs located.

 

[Gruni14]

Yes, start by checking the turbo actuator vacuum hose behind the engine down on the turbo. That hose tends to get hard and brittle from engine heat, and often need replacing. If you have any doubt cut it back or replace it. Make sure the entire vacuum path and other hoses are also good too. Check for vacuum at the hose (have someone goose the engine). If the actuator hose is good and you have verified vacuum, suck on the hose when hooked to the actuator and see if the actuator wants to move. Rent a hand vacuum pump (free at autozone) and check the actuator is good. It should suck "up". If not, likely a cracked actuator rubber diaphragm. Replace the actuator.

OR ...Could be a loose turbo pipe hose/connector. Let's say, someone serviced it at one time and the tech didn't put the hose clamp on properly or enough and it came off. That can happen. Or even a cracked plastic turbo pipe. I made an adapter out of a piece of PVC cap, and drilled/tapped it and put a gauge on it so I could put in 10-12 psi or compressed air. If it 'holds' then everything is good there. Then you need to look at the turbo. Sometimes the vanes can get stuck inside and can easily free'd up by moving the outer nut/shaft where the actuator goes ....with a wrench... 12mm or 13mm...I forget the size. Wiggle back/fourth.

Most of the turbo system you start by checking the hose and do a visual look of the turbo pipe on top and underneath to see if anything looks amiss. Good luck...let us know what the problem turns out to be.