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[feeutfo]

I have a similar problem. Made a post few days ago.
I've been on diagnostic tools, checked tons of stuff and it still has problems starting. Crank it and it struggles to start. From case to case either you can start it up or I just leave it a min or two and come back and then it manages to start. This happens only when the engine is cold. After start while still not on working temp it tends to choke if you slam on the gas pedal. This happens only when on gasoline, when you switch on LPG it works like a charm. When it gets to working temp either way it works normally.
No errors too. Will go to a garage next week to poke it a bit more.
Either its a sneaky sensor not working properly or its the fuel system but I doubt because we've checked it all.

Similar for you, crank sensor sees the crank position to work out timing of the spark. If the cs is failed or failing it may adjust spark timing incorrectly, or intermittently fail completely, engine temp is known to affect failing crank sensor. Some times fires when hot not cold, or vice versa.

 Ignore LPG behavior until the basic engine is fine on petrol under all conditions. Interesting though.

Again, see what others say...

[tgm147]

Another vote here for the fuel system. Had something like this in an old Corsa. Was the fuel filter - was all gunked up. If it hasn't been done in a while it won't do it any harm to be replaced. Would the Omega ECU generate a code for low fuel pressure?

[Koomorph]

Righto - went over to my dads with 5lt of petrol just in case..... his tank was already 1/8th full and the petrol light wasn't on - but we put the fuel in anyway.

Tried to start her up..... after cranking for about 5 seconds and similarly to yesterday.... I could feel she was trying to catch..... I carried on cranking and gave a little throttle.... this helped and she was almost catching........!! ..... carried on for another 5 seconds while gently applying part throttle..... and with a bit of a caugh and splutter she caught and fired up!!!  And was running totally smooth!!

Now, I'm still not sure it was a lack of fuel that was to blame.... but it could have been. 
I'm not sure when the filter was changed, will need to check the paperwork.

So I thought I'd see if there are any leaks onto the coils through the scuttle - poured water over the windscreen.... and sure enough.... a few tiny drips over the passenger side coil...... but a LOT more drips through the windscreen wiper hole over the driver side coil!

So - can you gents point me in the right direction for a couple of bit please:

1) Is there a guide for removing the scuttle and WHERE we should apply the silicone seal to prevent further drippage? Should that o-ring seal under in the wiper hole be replaced?

2) In case it is a dodgy/old fuel filter - where is it located and is it relatively easy to change over?

Thanks again as always everyone! 
Raf

[feeutfo]

Fuel filter is at rear, silver (once) aluminum canister drivers side(on uk car) of dif, forward of fuel tank. Tricky clips if you've not done one before, need three pairs of hands or the correct pliers. Either way you WILL get petrol in your eye, if not extremely careful.

[markspark]

Fuel pick up in tank ? ?

[Koomorph]

OK, thanks Chris and all, I'll need to do the scuttle first I think to stop it leaking any more and then see how it goes.

Thanks again! 
Raf