Hi john i suspect that you have 1 or more injectors leaking back .Take off the plastic inlet manifold and injector cover remove the leak off pipes from top of the injectors unplug camshaft sensor ( so it wont start) crank engine for 10 secs and see which injector is leaking that will be the one that,s shot You should get about a teaspoonful from each one if their ok there are some test tubes availible from mercs but i never use them When rebuliding plug the camshaft sensor back in i have missed it once doh?
Kev g
Ps ring me if you want john you have my number i don,t mind people ringing me as long as they post a fix on here when its finished T a