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Sounds like a air leak mate spray some carb cleaner or something allong them lines where the gaskets are are if the revs pick up that's where the leak is
Team Doesn't own a 306
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I bought one other day actually.
So whole point of getting car running nicely is to see if it gets to temp and not over heat during mot...
#2 Moonstone Blue HDI
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Assume that hose popped out of the rad?
The way the hose is fixed into the rad is shite really!
The idle will be a air leak somewhere or a very very sticky ICV although even if the plunger was fully open, i don't think it would rev up to 3k. Also check your TPS.
Team Eaton
1999 China Blue 306 GTi6 - Eaton Supercharged - 214.5bhp 181lbft