Thanks Lancee I shall give all the above a try, especially the air box as that's been a right pain getting it to fit properly. The injector was done at a family friends garage, my own fault as I was taken in by his spiel, and he did more damage than good. The injectors had been replaced by volvo during the recall back in 2005 or so but No.4 had developed a leak. He said they'd fix it and replace the seals. In fact they destroyed the injector and never replaced the seal or clamp so it leaked again. The replacement was alleged new bosch but I think it was a recon. They even put the wrong type in first time round. The leak is now fixed, I just want the knock gone and the growl back ha. Hopefully with the help and advice you've given that will be possible, thanks.
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