I have a vectra SRI 150, 2001. My vectra drops onto 3 cylinders quite often, with no engine warning light and totaly at random, i've been told the coil pack may be at fault but a friend who works for Vauxhall said the engine management would have picked it up. I've also heard that it could be a sticking valve, which sounds unlickly, has anyone had this problem?
My mate from vauxhall has plugged Tech 2 in and it has showed no faults, so i'm at a loss and i don't want the car to spend a week in the workshop. What's going on?
Any advise or sugestions will be greatly appreciated.