chim 450 start up

[jedmate]

Hi folks,I wonder if anybody out there has the problem with their car thats if there is problem.
On start up even when up to temprature,the revs rise to about 1500 then quickly
drop to normal 950 .is this normal
cheers

[miniman]

Yes the stepper motor is an unsophisticated item and adjusts the idle by trial and error so sometimes it takes a moment for it to sort itself out.

[jedmate]

Thanks for the reply ,try not to worry so much now

thanks

[EGB]

Give the stepper a good clean. Rv8R for info.

[Bassfiend]

Sounds like its working well to me...

Phil

[jedmate]

Thanks for the info chaps ,I think i will just enjoy the car

[quattrophenia]

Whilst we are talking stepper motors. I find that my stepper actually seems to 'gum-up' when the car has been on a nice long run. Which does seem to fly in the face of the conventional wisdom of giving the car a long run to blow everything out.
When my stepper is in need of a clean, I usually find that the revs drop to almost 200rpm for a few seconds then try to find their level. A good clean and it sits just below 1000rpm at idle.

[Chris71]

...They also have a tendency to over-fuel heavily on cold-start so don't be surprised if your fuel economy dips on short journies at this time of year.