Guys,
got a problem where my idle seems to increasing then decreasing, from 500rpm-700rpm. I checked if my std BOV was leaking, and yes it...however its still plumbed back into the system as std. Would this have anything to do with it? i have checked for any other vacuum leaks or intake leaks and there r none. i have cleaned the aac valve. and its fine. what else would it be? another thing that makes me thinks its the BOV, is because when i accelerate then back off straight away down to idle speed, it drops below idle then comes back up.
does the 02 sensor have anything to do with it? i seem to be getting average 12.2 litres per 100km, thats M5 driving, so 110-120km/hr.
ur help is appreciated!