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Originally Posted by dieseldiehard
You didn't say whether the wastegate is closing or not. My 87 had similar symptoms as yours and I found there was the crud built up around the flapper in the wastegate (the gate?) and it was binding - never fully closed- lots of effort to clean it paid off, I was about to send the turbo for rebuilding when I found the problem. 257K miles young and still strong!
DDH
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Technically, it is called a "charge pressure control valve" we call it a wastegate!
Thanks for that tip about crud clogging up the wastegate, or whatever we want to call it, I'll look into that when I do remove it sometime soon but I got a feeling that with it leaking oil as it is, I hope to rebuild it anyway.