Hi, just finished fitting a replacement head on my 94 3l turbo surf, it all went smoothly and started well but when revved produces clouds of black smoke and a loud, typically diesel clacking noise towards the back of the engine which dissapears on the overrun. Its definately down on power too. I've checked the valve timing and injector pump timing (not that I disturbed it anyway) and the only suggestion left is a faulty turbo hi pressure switch. Problem is, where is it? Any other suggestions? Ta. Bill.
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