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#1
03-23-2009, 10:23 AM
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Correct idle speed - 1982 380SL
When warm, the engine is idling at about 700 rpm when in gear, and about 1100 rpm if in N or P. 110,000 miles on the car.
From postings I'm picking up the idea that it should idel at 500 rpm in gear and about 700 to 800 when in N or P. Am I correct? If so, I've got the "high idle problem". Yippee! RL 
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#2
03-23-2009, 02:26 PM
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I have the same year and model and "now" my Idle is 700 to 800 in neutral. Was much higher due to a vac leak.
__________________
82 380SL 41K miles sold, 98 SL500 44K miles, 13 C300 4Matic, 14 CLA-250 4Matic
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#3
03-23-2009, 05:25 PM
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Yup, you've got the high idle problem, but there are far worse problems to have. Idle should be in the 550 range in gear and no more than 750 in neutral or park.
My 85 500SL has an electric idle control that failed, giving me the same problem, but I don't know if your car has the same system.
__________________
1985 500SL Euro w/ AMG bits 130k  1984 300SD Turbodiesel 192k  1980 240D Stick China 188k  2001 CLK55 AMG 101k  2007 S600 Biturbo 149k Overheated Project, IT'S ALIVE!!! 
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#4
03-24-2009, 02:49 PM
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Thanks for the info. I'm moving and don't have access to my shop manual on CD right now.
I think the first step is to disconnect the idle control unit behind the glove box and see if the idle speed changes. If it does not, then replace the ICU. If problem solved, smile. If not, carry on... Step number two is to disconnect a hose from the idle control valve and again see if the idle speed changes. If not, clean the valve. If no improvement replace the valve completely. Step three - start bebugging the entire vac system. Am I on the right track?
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