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Originally Posted by budwieser
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Hmmm. That sounds familiar - I'm sure there was something similar on here not that long ago...
Anyway, I found some interesting items here
http://www.google.co.uk/search?hl=en...+control+valve (can also add 'astra' for more specific links)
It's full name makes it's function rather obvious.
In my experience (mostly with mechanical, pre-computerised cars) this was a screw adjustment.
And the way they replaced simple mechanical controls with (prone to failure) electronic ones is one of the reasons I'd rather have an older car that I can keep going myself. All the later models require nothing less than £600 for each service just to keep running + £exhorbitant any time something goes wrong.