New Member, Please help! Have just fitted AOS and breather pipes, all pipes vacuum and others on no air leaks, drives as it should, idle increase from 800 to 1100 and stays there, blip the throttle returns back to 800 short while after goes back up to 1100? Driving me mad. AOS fitted was aftermarket FEBI. Would this have any bearing? Thanking you in advance Jeremy

 

Very possibly. Is your oil cap difficult to remove with the engine running?

 

Thanks for your reply oil cap comes off with ease, no sucking.

 

Seems like the AOS is functioning properly then.