Originally Posted by Alex300DT

Hey everyone,

Recently my om603 1987 300d started idling weird, after trying to find why, Ive only found that the wiring harness that goes from the battery area to the temperature sensors causes it, but when i push it towards the air filter a bit, it makes the engine run perfect.

Could anyone point me to what could change the engine idle speed in that harness so i know what wire to chase down?

I can get a video or pictures on here to show what im talking about if that helps.

Thanks,
Alex