Hi,

I have a 97 Vectra B X20DTL and I have a starting problem. I will describe it:
It doesn`t want to start first try randomly. Sometimes it starts first try, other times it takes 6-7 tryes to start it... When it eventually starts, it starts imediately without holding the starter motor too much... It doesn`t seem to be affected by engine temperature or outside temperature... In the winter it soemtimes started on very cold days first try other times it didn`t... Now in very warm weather it sometimes starts sometimes doesn`t. It doesn`t matter if I leave it for a long time or a very very short time... Sometimes it starts first time in the morning after 24 hours siting other times if I drive it for 2 hours, stop and try to start it doesn`t start first time... I mounted a one-way valve on the diesel hose before the filter... I changed the leak-off pipes from the injectors... Nothing. I measured the curent going into the fuel injection pump (Bosch VP44) and it`s the same with ignition on when it starts and when it doesnt... Engine light never comes on and Tester doesn`t see any issues...

What can it be? If anyone knows anything or has any advice please let me know.

Thanks