190E idles at 1300 when warmed up

[class1 190]

Hi all,
I have a 1991 190E. It starts and drives fine but once up to temp, it idles about 1250-1300 rpm. You can guess what this is doing to fuel consumption. There is an aluminium block/canister to the right of the injection unit which is connected by 2 hoses to the crankcase breather system and has a wiring connector. When I removed the air cleaner, it was obvious that someone had disconnected the wiring plug from this unit 'cos on reftting plug, it idled even faster . No experience of injection systems and appreciate any input.
Cheers,
Col.

 

[television]

If you have a plug on the throttle body, that is the idle switch, if that switch is not working it will be running from the main ECU and not the idle circuit

 

[mike65]

Dunno if this would work very well, but as a temporary fix you might be able to turn the warm idle to the slowest setting (its under the airbox facing the drivers side, use a flat head screwdriver to turn it anti-clockwise).

Mike.

 

[class1 190]

Thanks guys, I'll try your suggestions at the weekend. Col.