I recently traded my car for a '94 RS Legacy with the knowledge that the previous owner had blown the original turbo, put a new turbo on, and now it wouldn't boost. During the drive home there was a clunk(?) when I changed down gear, and suddenly I had 4 psi of boost.
The problem was intermittent, sometimes the check engine light would come on and it wouldnt boost at all, other times it would cut in and out of boosting. It only boosted 4 psi primary and 7 psi secondary though.
Literally the day after I picked it up, the turbo started making odd noises like there was something stuck in it, and would have a horrible whine whenever the turbo started spinning. It also started to blow a LOT of smoke.
Took the turbo off, and parts of the compressor wheel have snapped off, and I've never seen a turbo with so much shaft play or so filled with oil!
The question is, why did it do that to the turbo? Previous owner said something about the compressor wheel hitting the outside case and not spinning freely when he put it on, so was it just a rooted turbo, or is there a more serious issue?
I have another turbo on order, but I really don't want to put it on and then have it break on me in a week or two again?
Help ???
Cheers