2004 Vauxhall Vectra low power

check all your vacuum pipes and actuators are ok,check that inlet manifold,swirl flaps and egr are not carboned up.if so clean out thoroughly,make sure all your intake pipes are not loose or damaged,check your glow plug module/relay,what fault codes are you getting?

crankshaft senor its overheating causing it to cut out once it cools it will work till it gets hot again change this and im 99% sure youll have no more problems

if the crank sensor is overheating surely the same thing will happen to the new one?

Possibly modified part if known fault ?

Is this a 3 litre?

Mine did this, light on dash, stop lock the car for a min or so restart it everything then seemed fine.

Was just a 13 quid fuel filter in the end and because i was using cheaper morrisons / asda / tesco diesel. Run it with BP Ultimate see if it make a difference.

A bit of millers or redex wouldn't hurt either

hope this helps someone, cost me a fortune last few months, turbo boost sensor, egr filter, etc. etc. Was the fuel filter n lousy diesel all the time.