300SE high/sticking idle
 

Hello all, and please help! I have a 1990 300SE that has lately been acting up on start-up when warm; specifically, the idle RPM jumps to around 1500-2000 and stays there. My mechanic tried a new relay switch, which did not help. Any and all suggestions are most welcome, and thank you!

baysail

Throttle valve switch? Look at the following thread.

http://www.peachparts.com/shopforum/showthread.php?t=85503&highlight=89-300ce

Jorg