Re: Strange problem!
on the occasions that it fails to start do you see the orange keycode light remainging illuminated on the dash? if it stays on it means your problem is the immob is not disabled (most likely the code reader aerial around the ignition barrel has a loose connector)
assuming the key code light is going off as expected, you either have a fuel problem or an ignition problem. a fuel problem could be both over or under fueling.
since your problem only happens when the engine is warm (when cold start overfueling strategy is ignored) it suggests to me the problem is underfueling.
an easy check is to listen for the fuel pump priming every time you start the car from now on. you should be able to hear the fuel pump for a few secs when ignition is switched on. if you notice that the fuel pump doesnt make a noise immediately prior to every time it doesnt start, then that would be a very good clue that the problem is the fuel pump circuit.
on the other hand if you find that the starting problem never happens once you start listening for the fuel pump befor starting, that means the problem was the fuel pump cant build up the operating pressure in the fuel rail as quickly as you try to start the engine. that usually means you have a worn fuel pump or worn pressure regulator on the fuel rail.
as its only a warm start issue, the other 2 things that spring to mind are the crankshaft position sensor (my 1st recommendation in this case and definately something to test) and lambda sensor (if you also have sluggish MAF failure type probs once running and warm)
Last edited by jug; 18-07-07 at 14:15.