Try adjusting the idle adjustment screw with linkage removed.
The linkage being attached may have prevented the idle to drop to a lower rpm level.
Steps #2 through #9 on the DIY Adjust the base idle OM615, 616, 617 are with the linkage detached.
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78 W116 300SD 'Desert Rose' new as of 01/26/2014
79 W116 300SD 'Stormcloud' RIP 04/11/2022
Last edited by Alec300SD; 07-02-2022 at 03:04 PM.
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