Misfire help..

**roger vxr** · 18th June 2013, 07:40 PM

Hiya guys
My mate has a 2.2 SXI vectra with a problem... anyone help..??

It drives perfectly in normal use BUT,, when you wanna boot it -- say on a motorway to pass someone --- at the same rev point each time (about 4,000 revs)
there is a massive -- wot feels like a misfire (although hes not sure it is)... it really kicks back as if its misfirering...
already changed the coil pack, no diference..!!!!
i told him it cud be a spark plug breakin down...???
Any other ideas...
Thx

**Mr.P** · 18th June 2013, 07:42 PM

It sounds like plugs to me mate, we had it in a mates VXR8 and found one of the plugs had actually shattered and causing the problem.

**Rob** · 18th June 2013, 08:55 PM

That's plugs, mine are doing exactly the same

**astrasonly** · 18th June 2013, 10:49 PM

Common problem is either fuel rail pressure regulator, there is a modified part or the high pressure pump on the engine driven of the exhaust cam. Most likely one of these. Will post the technical bulletin when I get home for you.

**astrasonly** · 18th June 2013, 10:50 PM

Originally Posted by astrasonly

Common problem is either fuel rail pressure regulator, there is a modified part or the high pressure pump on the engine driven of the exhaust cam. Most likely one of these. Will post the technical bulletin when I get home for you.

Get home from Spain on Friday. Pm the full chassis number