If it starts and drives OK I doubt that the timing is out. I think a faulty injector is quite likely.

hi i have serviced it and put some forte injector cleaner in but still sounds really rattley when you rev it only seems to be when i done waterpump and cam belt

hi my vectra is the 120 8 valve model and just put it to mark on cam cover dont think you can pin it also on crank timing the tool was bolted to it but also the little nick in actual crank pulley did not line up with nick in engine cover , do not know if this ok as when i put marks to where i thought they were meant to be , engine locked up by hand

Correct valve timing is not about lining up the marks on the pulleys, it's about the correct relative positions of the crankshaft, camshaft and fuel injection pump. Nearly all diesel engines require setting tools to lock the shafts in the correct positions, and to allow correct tensioning of the belt with the pulleys slackened. Failure to do this will mean the timing will move when the belt is tensioned, and will susequently be incorrect. Not enough to cause damage to the engine, but sufficient to have an effect on emissions, and in the case of pump timing far enough incorrect to cause engine knock (advanced) or smoke on starting (retarded).

hi have bought new crank pulley and bolt but just wondred as bolt is left hand thread would undoing it with breaker bar and somebody with foot on brake and car in gear be able to undo it as i have not got air wrench thanks