JohnnyJayhawk

It would either confirm or deny that it had anything to do with the cable. Thank you.

I was really hoping that this had happened to someone else out there in 7 land and could let me know what they did to fix it. I have owned an Elan, two Europa's and now this Caterham. Multiple Healy's' MG's, Triumph's etc.. I'm not a stranger to British cars with dual carbs. This one does have me baffled though. So your comments are welcome but some of the suggestions are just like you didn't read my explanation of what was going on. Also the dig that I don't know what I'm doing really hurt. 🤕

It has nothing to do with the balance and sync of the carbs. The balance and sync have nothing to do with the idle slowly gaining RPM's as the engine warms up. But thank you for your comments.

Yes. When we move it by hand up by the carbs the idle goes down to normal and stays there until you push on the throttle with your foot then it takes off again.

They work great until the engine gets warm and then the idle just keeps climbing. Car runs great until then.

Do you think that the spring gets weak as it heats up?

When I start it up it idles just great. As the engine warms up, the RPM's get higher and higher. After 10 to 15 minutes my idle is up over 3,000. I can, with my hand, move the linkage that is up by the carbs, and can get it to go back down to where it should be. It acts like the spring isn't strong enough to seat the throttle linkage back to full off. Blipping the throttle pedal has no effect. The idle stays high. I have checked for vacuum leaks, but it doesn't appear to have any. Any suggestions? The carbs are on a 1,720cc Ford Kent Crossflow.