High Idle - PeachParts Mercedes-Benz Forum

silvercloud2 · #1 03-11-2015, 08:35 PM

High idle at start on W201, 190E, 2.6 1993
Any ideas or fixes or where to look. I have already cleaned and lubricated all the linkage and check for vacuum leaks.

Lost, help, Thanksd

tecqboy · #2 03-11-2015, 09:56 PM

If the idle comes down to "normal" when the engine reaches operating temperature, check the coolant temp sensor.

silvercloud2 · #3 03-12-2015, 09:36 AM

Thank you. The idle does return to "normal" after the car runs, but if I stop at the store for a few minutes, when I restart, it is back up for a bit. I will check the "coolant temp sensor today.

Again, Thank you.

liquiddog · #4 03-12-2015, 01:36 PM

Quote:

Originally Posted by silvercloud2

Thank you. The idle does return to "normal" after the car runs, but if I stop at the store for a few minutes, when I restart, it is back up for a bit. I will check the "coolant temp sensor today.

Again, Thank you.

When mine did that it was the IAC. The airflow potentiometer was also bad and contributing to the problem, but was more directly related to hesitation on take off.