Thanks for the reply 534BC, I think the fact that the crank sensor line had shorted out and on the exhaust manifold it did some internal damage to the number 4 cylinder. Lots of metalic noise, guess the next step will be to pull it apart again and see if I can see anything there. I just wondered if this ever happened to anyone else while the engine was running. I have never heard of a problem like this but I cannot explain it otherwise.