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Old 01-26-2010, 04:21 PM
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Join Date: Jan 2010
Posts: 20

MY 1987 560 SL IDLES BETWEEN 10-20 RPM.

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Old 01-26-2010, 04:26 PM
rowdie's Avatar
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Join Date: Nov 2008
Location: NE Oklahoma
Posts: 1,418
Vacuum leak. What is your economy gauge reading. Does it idle down after warming up?
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Old 01-28-2010, 01:52 PM
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Join Date: Feb 2003
Location: roslyn, LI,NY
Posts: 445
idle adjustment on sl

On older models there is a plastic slotted idle screw at the front of the air cleaner. Look to see if your car has such. Hope this helps, good luck Abe G
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Old 01-28-2010, 02:39 PM
KCM KCM is offline
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Join Date: Jan 2004
Posts: 625
Throttle position sensor went bad on my 1989 and caused that problem. It would not make a closed circuit when the butterfly was closed.
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Old 01-29-2010, 08:50 AM
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Join Date: Oct 2007
Location: Greater Metropolitan Beaverdam VA
Posts: 2,534

see my post under "tech help".
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