2002_auto_tdi
Veteran Member
Genesis, I feel like I have done alot of these tests already. What do you think about starting from step 2 and then working backwards? Is there a way to simplify when boost is expected? I think I would reasonably just be able to ask my passenger what they see when I am on it no?OK, so to recap:
1. Pump replaced, was 11mm (auto box) now is 10mm.
2. Would not rev and will not go over 25mph on the road.
3. Boost requested looks ok, actual is flatlined (zero)
Presumption from no power is that actual really IS zero (e.g. MAP sensor and/or its wiring is not dead, which should throw a code and would put you in limp mode -- you have no code, however.)
IMHO where you go from here is:
0. Verify the N75 output actually goes to the turbo actuator, stick Mityvac on line at the N75 going down to the turbo, look at it and make sure it moves when you apply vacuum. If it doesn't or the Mityvac doesn't hold vacuum the line may have a hole or obstruction. Fix line and/or routing.
1. Tee into the vacuum line from vacuum source to the N75 input port at the valve with the Mityvac (so you have the gauge to read it.) Does it have vacuum with the engine running at idle? If not, figure out why (no vacuum, no boost.) If vacuum is there, reconnect as normal.
2. Tee into vacuum line AFTER N75 toward turbo actuator, put gauge where you can see it. Plug in VCDS, have someone drive car with you in pax seat. Note requested boost. When boost is requested does vacuum show up on the gauge? If not, N75 is either not getting drive signal (wiring) or is not working.
You've got a divergence between boost requested/actual and this started when the pump was replaced due to a failure, and you replaced the turbo. Assuming the pump timing is not WAY out of whack (retarded) my money is on vacuum never getting to the actuator. No vacuum, no boost, no power and with a 10mm pump on auto nozzles without boost you're going to be basically driving a lawn mower. IMHO you have to verify the above are all operating "as expected"; I bet they're not.
Thanks.