The turbo never "engages". The turbo spins all the time, but the amount of exhaust gas driving it is adjusted by the wastegate.
The problem you are experiencing could be due to the wastegate's vacuum tube being disconnected. The wastegate is meant to open as the inlet manifold pressure increases, so that the turbo spins less and doesn't compress the air too much. It could also be the result of a faulty sensor, but check the vacuum tubes first. Your wastegate actuator is fitted just behind the turbo. If the pipe has come off recently, you should be able to see a clean section where it's meant to be joined to the actuator. The disconnected pipe should be fairly close by. Again, the pipe should be connected to the inlet manifold though from memory I think this is one of the difficult to reach pipes on the back of the engine.
As a side note, the turbo guage on the dashboard is very poor. Even if only for the sake of diagnostics, you should get a cheap direct vacuum driven guage.
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If you pressed the brake quite hard and the engine cut out then try checking to see if you car has an emergency fuel shut off switch. Perhaps this has engaged incorrectly. These are normally located near the driver or passenger seats in older cars, and are designed to engage in the event of a crash cutting off the fuel if your car has one.
if that hasn't happened perhaps you have a blocked/restricted fuel line.
Have you checked the PCV system?? If its stuck in the closed position then you will lack power and turbo boost. A vehicle needs 3 things to make it run proper; FUEL,FIRE and AIR. Try that and see if it helps.
this sounds like a fuel flow or supply problem.you may also have a sensor problem that controls the turbo operation under different throttle and load positions for proper operations.i`ve seen turbos impellers seize or not turn freely.these are different areas to check into,note parts for these turbos and supercharged t-birds are hard to find when it comes to components as they only made them for about 3 years.
from what you say, they said," it was the injectors that were faulty",hence changeing them,you could have tried a fuel additive/injector cleaner which could have had the same effect.....try a can to 5 gallons of fuel and if no improvement within 100 miles,give them HELL.smoke from a turbo engine could be dirty fuel/compression low/air leak from the turbo pipes/lazy turbo,etc but this engine is not exaclty the cleanest on emmisions.so expect a SMALL amount of smoke when cold or when accelerating HARD.
Could be one of many things. First off if you can"t remember the last time you changed the fuel filter (there's only one, and it's in plain sight) then do it. It should be replaced every 20k miles. If i were to guess though I would start to look at the turbo actuator system. The turbo is engaged by vaccuum. there's a vac pod on top of the turbo with a vc line going to it. At idle, when you don't want boost there is no vaccuum sent to the actuator pod. The pod is connected to vanes in the turbo that direct the exhaust flow either into or around the blades. Under full throttle vaccuum is sent to the pod to move the vanes inside the turbo to direct exhaust into the blades causing it to spool up and give the car some zip. I have replaced quite a few of the pods. Here"s some more to think about...
Vac is generated by a vac pump off the back of the camshaft. Check to see if there is at least 15" of vac.
VW doesn't provide a port to measure boost. Anywhere. In my opinion all turbo cars should have a boost gauge. Either install one- it's not hard, or get someone with a VAG.com type scanner and see what the boost is. Stock I think was a lazy 13psi under acceleration
Use a vac pump, hook it to the line going to the vac pod on turbo and make sure it HOLDS vac.
other poss. causes- vac leak somewhere else, check all lines
turbo crusted up inside
something else weird.
When you find the problem please let me know. Im curious...
It sounds like a fuel delivery issue so it could be many things such as low fuel pressure from the pump,clogged or partially pluged fuel filter, a malfunctioning throttle posisitioning sensor (if you have a check engine light on) or if its turbo it could be turbo lag etc.