1984 500sl High Idle Issue any one have a 500sl m117.963 vacuum diagram

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1984 500sl High Idle Issue any one have a 500sl m117.963 vacuum diagram

10-23-2017, 02:38 PM

Diseasel300 Diseasel300 is offline

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I'd start with the idle control solenoid. Sticks right out front above the coolant hose. Pull the plug off and see if you have 12V. If you do, cycle the plug a few times, you should feel the solenoid "vibrating".

If no 12V and no "vibration", there is a control box behind the glovebox that controls the idle speed. If it fails (usually cracked solder joints), the default is to run high idle (1500-2000 RPM).

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