Turbo bypass valve

[Colin Hames]

To all,

I recently retrofitted my 5tqw with a turbo bypass valve or cut-off
valve as Audi likes to call them.  I had a 1" metal tee welded
perpendicular to the intake pipe half way from the air meter boot to the
turbo inlet.

I ran the car for a few days after the installation and everything
seemed fine.  After letting the car sit for 2 weeks, I cranked it up
last night for a quick run to the store ( 6 to 10 miles) and halfway
there I had some serious problems.  I now have oil leaking from my
distributor/hall sender and blue smoke drifting out the exhaust.

Is it possible the bypass value is sent pressure back towards the air
meter and through the vent hoses to the valve cover,  essentially
pressurizing it and the crankcase, blowing valve stem seals, distributor
seals, etc.

Is the new issue just coincidental on a high mileage car? ( 160,000 )
By the way, the car is completely stock.

Colin Hames
Minneapolis, MN
'86 5tqw
'90 200t