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Hi, the idle control valve is located at the back of the engine on the left side of the carb, you will have to remove the air intale ducting to get at it. It is approx 7" long with a connector plug on the end facing frontwards. The ducting is secured to the carb by a jubilee clip, you only have to remove the first 2 sections to get at the AIV. The valve is normally held in place by 2 Allen screws, use carb cleaner on the valve after you have stripped it down. (it is worth knowing that a new valve from vauxhall is £100 + whilst there are always plenty of brand new ones on eBay for £25 - £30). While you are in there it is worth removing a large rubber pipe which goes from the intake ducting to the rocker cover & a smaller rubber pipe which sits beside it, these often are very clogged.
Note. I am currently having problems with my vectra stalling a idle when i get to junctions etc, i have replaced the IAV & cleaned the pipes but still have not solved the problem, i take you have a similar problem so if i find a solution will report back.
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