What can i possibly do next (150cdti)

[kirkyoke]

Hi all,
Having read a lot of posts regarding misfire on the vectra cdti's i still cannot cure this problem of mine .
It all started approx 6 months ago, when pulling away from junctions, roundabouts etc, i get the occasional split second cough (would'nt say misfire) sometimes it does it every couple of miles then sometimes it will run a week without doing it!! It is fine if you boot it all the time!!
Heres what has been done recently:
New EGR Valve
New manifold & swirl actuator,
New Fuel Filter,
New Air Filter,
But still to no avail,
Can the No.3 injector wire cause just a split second cough like this,
No codes are present using the snap on solus pro & sykes pickavant acr4 G2 suite,
My last resort is to send it to the dealers to see if they can find it using tech2 but i hate the idea of paying £60-£70 for them to say it could be this, could be that etc, (you know what i mean)
Can the accelerator pedal sensor cause this as it always seems to be when the pedal is in a certain position!
Seriously thinking of getting rid, but it's such a nice car except for this little hiccup now & again,
There is a slight rattle from the Dual Mass flywheel (could this cause it??)
Any help greatly appreciated!
It is a 55 plate vectra cdti elite 150
Thanks.
Dave.

[Big Sig]

If you haven't done the 3rd injection mod then do it. Its very cheap and well worth while as it could be the cause of your troubles.

[kirkyoke]

Thanks for the reply Big Sig, will try it & keep you posted although i would have thought that moving the injector wire with the engine running would make it misfire but it does'nt,
Cheers,
Dave.

[Big Sig]

Its the contacts that fail not the wire normally as it gets stretched. The mod is only about £20 so well worth it imo. Although cleaning the connections can be a quick and usually temp soloution.

[kirkyoke]

No.3 injector wiring now done & guess what?? ....... it's still the same ... now totally baffled!! anybody any other ideas??

[plasma]

Check the engine software version...? Think there was an upgrade for a problem similar to this. Contact your Vx dealer and get them to check...

[kirkyoke]

ok thanks plasma, will give the robbing b******s! a ring, i'm getting fed up of spending on it now for such a ****potical fault, time for it to go i think!!

[GazVXLINE170]

Mines used to not so much cough but hesitate and judder at 2000rpm, and it turn out to be the Intercooler had split.

It might not be the intercooler but a split hose?

Gazza4

[kirkyoke]

hi gazza, no judder or power problems just the intermittent cough every now & then, not enough to throw a code up i don't think (as much as i wish it would)

[GazVXLINE170]

hi gazza, no judder or power problems just the intermittent cough every now & then, not enough to throw a code up i don't think (as much as i wish it would)

Thats how it started and was like that for a year, then after I cleaned the egr valve it progressively worse within a week.

Gazza4