General Engine Rattle & unburnt fuel

[Timcho]

Hi All
I have a 115 Fiat Multipla 2002 and yesterday it started to miss and sounded a bit rattley. This morning it refused to start at first but when it did start it sounded aweful, Rattling and very smokey. The smoke was gray / whitish and after a few mins the rattle sound died off. It was still missing slightly and smokey on reving. A freind and I suspect maybe a injector problem. If so any idea how easy to change them and if you think this is the problem any way of checking it? many thanks Tim

 

[momoe]

Injectors are reasonably easy to get to, secured by a Y clamp under the induction manifold. Can't remember if you have to remove the induction manifold to replace.
If the misfire/smoking is constant, you can find out if it's an injector fault by pulling the electrical connector off each injector in turn, if the problem gets noticeably worse - that injector is probably working, if you pull a connector off and the problem remains - that's the faulty injector.
I wouldn't rule out an open EGR valve if the injectors seem ok.