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[Omena]

Those engines have very minor changes.  Pretty same engines with belt.

Z22 series are vectra etc chain models.

[RobG]

What are the differences between X22SE and Y22SE then

Pre 2001 2.2 was fitted with the Y22XE, post 2001 had the X22XE.

[Lazydocker]

There you go... I'm not an expert on the 4 pots

[TheBoy]

What are the differences between X22SE and Y22SE then

Pre 2001 2.2 was fitted with the Y22XE, post 2001 had the X22XE.

T'other way round. Y had tighter emissions.

All Omega 2.2's (petrol or diesel) are DBW.

The idle of about 850 is right for 2.2, and the engine is tuned to run on RON 91 IIRC. Using a higher octane fuel may make a small, but quite insignificant difference, as its not highly tuned.


OP - clean the throttle body, I suspect its a tad sticky as it opens from idle. Other than that, it sounds right. Raising RPM is nothing more than a bodge.

Oh, and you should be able to post normally now I believe

[RobG]

T'other way round. Y had tighter emissions.

My mistake TB (typo error)

[biggriffin]

As TB said. Clean throttle bodies. And bloody proper full service. Clean everything 

[sjc]

If OP REALLY wants to raise the idle (which may also make it fail emissions testing, not sure) then it can only be done with a Tech 2.

On my MV6, I went the other way when I converted it to manual and dropped the idle right down (one click up from feeling a little rough), the fuel computer reads 0.2gal/h with a warm engine which makes me feel enviro-friendly when I'm stuck in stationary traffic 

As has been said already - it's a heavy car, you need to give it some revs when pulling away.  If you're getting judder/vibration when pulling away then that's a clutch or flywheel problem.