Omega Owners Forum

Omega Help Area => Omega General Help => Topic started by: Darth Loo-knee on 19 June 2007, 20:25:22

Title: Vectra V6
Post by: Darth Loo-knee on 19 June 2007, 20:25:22

A guy at work who has a 1999 2.5 Vectra asked me if at 3000rpm i get a flat spot, then after that it surges?? he has had several garages telling him different things, also he gets a miss....I said "no to the flatspot, but maybe Cam Cover Gaskets may need replacing, which has caused the oil to go down into the spark plug wells, which could cause the miss... but i will see if i can find out whats the problem..

Have I told the bloke right lads?? :)

Title: Re: Vectra V6
Post by: sounds2k on 19 June 2007, 20:38:19

flat spot sounds to me like the cam timing may be out ?

Title: Re: Vectra V6
Post by: TheBoy on 19 June 2007, 20:43:02

Quote

flat spot sounds to me like the cam timing may be out ?

Would fit the symptoms...

Title: Re: Vectra V6
Post by: Darth Loo-knee on 19 June 2007, 20:59:24

What do mean a tooth out maybe? would Vauxhall do that? :-?

Title: Re: Vectra V6
Post by: TheBoy on 19 June 2007, 21:03:10

Quote

What do mean a tooth out maybe? would Vauxhall do that? :-?

Yes they would!

Title: Re: Vectra V6
Post by: VXL V6 on 20 June 2007, 12:04:29

This was a very common problem with the V6 Vectra that was never really sorted out, The Plenum design is completely different (I once saw someone who had grafted on an Omega Plenum but he had to make modifications to the bonnet to be able to shut it!)

Courtney Turbo (I think the chaps name there was John) struggled with a solution as well. the only thing that does help is the 'three pipe mod' of which details can be found on the vectra sport forum. Basically involves modifying the VIM pipes to allow a more direct flow of air.

i would say it's worth looking for obvious problems as well (such as those listed above) especially if the problem didn't seem to exist before.

Title: Re: Vectra V6
Post by: Jay w on 20 June 2007, 12:31:24

fitting a higer pressure fuel reg goes some way to ironing out the issue, but still doesnt completly get rid of it.

The FWD V6 never seemed as smooth as the Omega no matter what was tried

Title: Re: Vectra V6
Post by: Marks DTM Calib on 20 June 2007, 12:36:23

The Omega has a better multiram and tuned inlet section (more space) hence its much flatter on torque delivery...

Title: Re: Vectra V6
Post by: wastedperfection on 20 June 2007, 15:55:59

my 2.5v6 omega has a flatpsot at 3k then kind of surges at 4k , what could be the problem with that? , also any pics of how to do the 3 pipe mod?

Matt

Title: Re: Vectra V6
Post by: omega18 on 20 June 2007, 19:37:43

If you are looking for information on Vectra tuning then have a look at the following site
http://www.vvoc.com/

It has a wealth of knowledge on tuning the vectra and plenty of How2's

Karl