Hello,

I have strange problem. I was driving back home from bowling alley when I noticed that the car won't boost. Then I noticed that the boost gauge isn't working at all (no vac or goost, steady at 0),

At home I went right to the Tee connection (I hooked my boost gauge with a T to FPR vac line). The part of line which goes from Tee to under the manifold was torn. I replaced the piece and started the car. No activity on a boost gauge (neither vac or boost).

I disconnected all Tees, lines e.t.c., attached a vacuum line to under manifold connection (to fpr) and tried to sk. seafoam. to see if it will suck it it through this port. It won't. Car also running rough. No check engine though.

As long as I cant see whats going on under the manifold I have no remote idea what could be wrong,

I would appreciate any input before ill start taking things apart ...

Setup is something like :

FPR (1)<--> (1A) TEE (2) <-->(2A) GOES UNDER MANIFOLD
(3)
^
(3A)
(BOOST GAUGE)

Line broke at 2-2A segment and replacement wont resolve the issue

Thank you

 

more info:

1. car runs well over 1000 rpm on idle.
2. runs fine except there is no turbo and I can clearly hear compressor surge when I swich gears (i connected boost gauge to the vacum line on to of the diverter - no vac or boost as well)
3. Cruise control works
4. Six check engine codes: misfires on all cylinders, random misfire, rpm on idle higher then expected, system too lean
5. When i clean the codes, car runs like a ford bronco then adjusts
6. Crankcase breather hose on top of the engine (spot where the catch can goes to) was destroyed (was fine a week ago)

I also removed black metal plate (next to manifold to check whats going on there - the line which feed all stuff under it is dead as well)

This makes me think:

PCV / breather / Jet Suction Pump could cause this problem?

Controls on turbo side like N75 went out? Unlikely ... but

 

Time to remove the intake manifold off and see whats all off/broken. Its rather straight forward.

 

It turned to be out that. Multiple vacuum lines failure. (Both connections to manifold, fpr, e.t.c.).

Never seen anything like that on my A4 ....

 

The TT is not an A4.
You'll experience things beyond your wildest expectations unique to the TT.