[Guest]

Today, while doing a track day at Donnington it started to idle funny half way through the day. It was idling at about 14-1500rpm and later on would rise to 1700rpm then drop to 1200 and rise back to 1700 and so on.
Why is it doing this and hasa anyone had this problem.
I've recently started using octane booster and fitted an Air Filter, but I can't see this being a problem as they've been in use for the previous 500 miles.
Help me someone, please!
Steve

 

[Guest]

Rosco

Is your car an older Lancer? If so what you describe is commonly attributed to the idle stepper control motor that contols the idle. Go here for a good diagnostic procedure:

http://www.dsm.org/how-tos/tttt/tttt3.html

 

[Guest]

It's an Evo VI. Thanks for the tips I'll try some of them tommorrow when I've got more time.
Steve

 

[Guest]

Hi Rosco,sounds like you have an airleak,mine did the same a few days ago symptoms the same,found a small vacuum pipe had come off,have a look at all related vacuum pipes etc,hope you find it.

Regards Mak One Evo

 

[Guest]

Yeh thanks Mak One, someone else suggested that but we couldn't see anything obvious!
I'd guess it could only be a small leak otherwise it would probably be worse wouldn't it?
I'll investigate tommorrow!
Cheers
Steve