High Rpm On Cold Start

[Harshanas]

I kind of had a similar issue where the rpm goes high randomly such as when im in a traffic block or wherever its idling.

Cleaning the throttle body solved the issue.

Apparently when there is a carbon build up, it happens.

[E L N I N O]

is it bad for the car if you just start n drive up in the mornings before engine settles in its normal idle speed? or its better to wait until it heats up (until idle goes down)? i have experienced a bit of knocking when i drive straightaway without waiting... do i need a tune up? btw the car is a lancer cs1 (carb model).

[Malaka2]

Guys, Little problem in my mark ii.. Today morning when started engine, RPM raised to 1500 and become stable after engine got hot to 800. Why is that? Anything wrong?

[shanX]

it is normal, afaik

[mazdaspeed]

it is normal, afaik

agree with ShanX - it's to help with the cold start

[Rebel]

Yep. Its to help the engine reach operating temp faster.