93 Vector Sport. Turbo keeps cutting out

run the fault codes and look for a problem area in the vane actuator of the turbo
it could be a sensor problem or a MAP sensor problem
this is indicated by the pressures being generated or not generated by a turbo generating pressure from the throttle opening on acceleration or held at constant speed

check your turbo again. also check whether the waste gate valve is working by testing it with vacuum tester.Or check if any flex hose on turbo or inlet manifold has not cracked or sheared and cause a leak and that is why you might have low power with lots of smoke.

my 1.9 polo dti revs to 3000 then losses all power and starts to smoke

I would start by checking for a fouled spark plug/wire. Also, check the fuel filter. It doesn't have to be good just because it is new. Could have a factory defect.

I had a similar issue to this after I got in a VERY small fender bender (literally) in an 87 Turbo Supra. In my case, my pasenger fender got pushed in JUST enough to crack a charge pipe and cause a boost leak.

Basically, what was happening was the turbo would spool and build boost, the mass fair flow sensor would read all this air coming in and tell the ECU to dial up the the appropriate amount of fuel. When the air reached the cracks in the charge pipe, it would escape out of them. Thus there was a much lower air-to-fuel ratio, causing less fuel to combust, which lead to power loss and black smoke out of the exhaust.

My guess is either an oxygen sensor, or more likely a boost leak.

Good luck mate.

yes it is most likely the turbo oil seal is leaking.

check the hose on the intercooler and around the turbo, check for split on turbo and the intercooler hose not too soft as they can collaps while driving

I'm assuming that that smoke was more previlant while going uphill because that's when the turbo would be really spolling up to max psi. I would guess that if you really got on the gas hard and got the turbo going even on a flat surface, that you would notice the smoke too. The loss of power and the white/grey smoke are tell tale signs that your turbo is bad or starting to fail. Good luck!

You will need to change the o2 sensors, your car is running in limp mode (giving to much gas)
Most common problem if you need additional help
hope this helps

most likely the turbo, if its a darker or bluish smoke.