[jackliu1980]

Hi, has anyone have engine idle RPM fluctuation problem on '07 MCS? In my car, most of the time it is stable, but sometimes it just keeps bouncing +/-50rpm. Occasionally, it even goes down about 150-200rpm and suddenly bounces back along with ECU throttle control (I heard something like computer applying throttle by itself)

My engine light went on before, and during the time my engine light was on, my idle RPM fluctuated even more. If I applied and let go the throttle, the RPM didn't settle nicely, either. The dealer diagnosed it and found a hose was lose and went sealing it. Now the RPM settles nicely when I apply and let go the throttle, but the idle RPM fluctuation phenomenon still exists even though the amplitude becomes less.

Currently this doesn't affect my driving, but I'd like to know that whether I should keep worrying about this and whether there's anybody has similar issue as that I have.

Thanks,

Jack

[LizzyG]

My 2006 Cooper fluctuates at idle occasionally, but only if I start it when it is warm. It only does it for a couple of minutes then rights itself, so I have never bothered to take it in.

[slider]

Quote: Originally Posted by LizzyG (original)

My 2006 Cooper fluctuates at idle occasionally, but only if I start it when it is warm. It only does it for a couple of minutes then rights itself, so I have never bothered to take it in.

my works cooper s does it alot but know one has ever been able to sort it out. If you plip the throttle a couple of times it will normally settle down.