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#1
09-12-2006, 09:11 PM
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Idle Adjustment
I think the idle on my car is too high. It sits at 1000rpm most of the time. Where do I adjust it on this car?
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#2
09-12-2006, 10:27 PM
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I believe your 81 300SD has a small knob like thingy on the dash, left of the steering colum. Look in the manual.
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#3
09-13-2006, 07:02 PM
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Quote:
bob 1981 240D
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#4
09-13-2006, 07:20 PM
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Yes, it is a tall screw looking thing behind the lever for the "STOP" button....its a flathead screw, long tube, with a locknut at the bottom (14mm I believe...) Counterclockwise is slower, clockwise is faster.
The SD does not have a knob on the dash, they don't usually need an idle adjustment when its cold....they have enough cylinders to keep going.   However, it should be set to about 700-750rpm, not 1000. Are you sure its idling too high? Sometimes the tachometers just read wrong. For reference yours should be running about 3100rpm at 70mph on the freeway......
__________________
-diesel is not just a fuel, its a way of life-  '15 GLK250 Bluetec 118k - mine - (OC-123,800) '17 Metris(VITO!) - 37k - wifes (OC-41k) '09 Sprinter 3500 Winnebago View - 62k (OC - 67k) '13 ML350 Bluetec - 95k - dad's (OC-98k) '01 SL500 - 103k(km) - dad's (OC-110,000km) '16 E400 4matic Sedan - 148k - Brothers (OC-155k)
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#5
09-13-2006, 07:42 PM
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I can't find a screw behind my stop lever. Can someone point it out in the picture?
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#6
09-13-2006, 09:07 PM
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Ita actually on the Injection Pump. look down between the IP and the engine block. You will see it right next to the linkage that connects to the IP.
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1983 Mercedes 300D Atlanta, GA 
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#7
09-13-2006, 09:13 PM
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Sorry.
 I meant behind the rod that connects to the stop lever. It is indeed down on the IP. You will need a Deeep socket to loosen the locknut first, then you can turn the idle screw, be sure to try and hold the screw still when re-tightening the locknut as it can turn the screw with it and send it out of adjustment again.Easy way to do it: Hand tighten locknut with long socket by hand (hold the socket) and keep a flathead screwdriver on the screw to keep it still. Once the locknut is hand-tight you can switch back to using a ratchet to tighten it down and there's no need to hold the screw still anymore. I took your picture and pointed out exactly where it is: 
__________________
-diesel is not just a fuel, its a way of life- '15 GLK250 Bluetec 118k - mine - (OC-123,800) '17 Metris(VITO!) - 37k - wifes (OC-41k) '09 Sprinter 3500 Winnebago View - 62k (OC - 67k) '13 ML350 Bluetec - 95k - dad's (OC-98k) '01 SL500 - 103k(km) - dad's (OC-110,000km) '16 E400 4matic Sedan - 148k - Brothers (OC-155k) Last edited by pawoSD; 09-13-2006 at 09:27 PM.
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#8
09-15-2006, 02:57 PM
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It worked
 Thanks. Should I adjust the throttle linkage so that the little pin is all the way into the thing on the stop lever at idle?
__________________
Ich liebe meine Autos! 1991 Mercedes-Benz 560SEL | Megasquirt MS3-Pro | 722.6 transmission w/ AMG paddles | Feind Motorsports Sway Bar | Stinger VIP Radar | AntiLaser Priority | PLX Wideband O2 | 150A Alternator | Cat Delete 1981 Mercedes-Benz 300SD | Blown engine, rebuilding someday... 1981 Mercedes-Benz 300SD | Rear ended, retired in garage. 2009 Yamaha AR230HO | Das Boot Excessive speeding? It ain't excessive till I redline!
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#9
09-15-2006, 03:07 PM
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Quote:
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Linear Mode
