why does my idle go up and down between 7K and 9K and never stablizes

Asked by Mar 30, 2014 at 02:20 AM about the 1990 Mercedes-Benz 300-Class 4 Dr 300E Sedan

Question type: Maintenance & Repair

1990 Mbenz 300 E four door sedan with M103 engine has problem with idle. It goes in
waves or rocks between 5K and 10K rpms then it runs fine in all other driving situations; what
could be problem?

1 Answer


I would say it is the Fuel Injection Idle Speed Stabilizer. Also known as a Idle Air Control Valve.

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