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#1
04-18-2004, 10:27 PM
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What does this thing do?
In adjusting my tranny linkage today, I noticed a new thingy and was wondering what it is/does?
On my SDL, if you were looking at the fuse box, immediately above it, between the fuse box and the firewall,, there is a little dial/knob with numbers on it. What is it?
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Enough about me, how are you doing? Last edited by Plantman; 04-18-2004 at 10:34 PM. 
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#2
04-18-2004, 10:35 PM
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What year please.
???? 300 SDL - 330,000
What year please.
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ASE Master Mechanic https://whunter.carrd.co/ Prototype R&D/testing: Thermal & Aerodynamic System Engineering (TASE) Senior vehicle instrumentation technician. Noise Vibration and Harshness (NVH). Dynamometer. Heat exchanger durability. HV-A/C Climate Control. Vehicle build. Fleet Durability Technical Quality Auditor. Automotive Technical Writer 1985 300SD 1983 300D 2003 Volvo V70 https://www.boldegoist.com/
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#3
04-18-2004, 10:41 PM
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It's the idle adjustment......
#4 is considered the normal idle speed at 630 rpm's. To adjust it you pull up on the knob,THEN turn it. #1=570, #2=590, #3=610, #4=630, #5=650, #6=670, and #7=700 rpm's. ( At least for 1987.) Just compare it with the tach.
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Paul 1987 300 SDL; 2000 ML; '69 MGB; '68 VW Fastback Last edited by PaulH; 04-18-2004 at 10:46 PM.
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#5
04-18-2004, 11:10 PM
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Idle speed control/altitude adjustment. Idle speed (other than base) is electronically controlled on the 603.
Peter
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1972 220D ?? miles 1988 300E 200,012 1987 300D Turbo killed 9/25/07, 275,000 miles 1985 Volvo 740 GLE Turobodiesel 218,000 1972 280 SE 4.5 165, 000 - It runs!
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#6
04-18-2004, 11:18 PM
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PSFRED,
So unless I am driving at altitude, there is no reason to ever touch that thing? Should it be at 4 or would it make a difference at Sea level? Thanks
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Enough about me, how are you doing? Last edited by Plantman; 04-18-2004 at 11:27 PM.
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#7
04-19-2004, 09:28 AM
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At what rpm is a 1987 603 supposed to idle at sea level? Thanks I was wondering what that knob was for.
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2016 Corvette Stingray 2LT 1969 280SE 2023 Ram 1500 2007 Tiara 3200
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#8
04-19-2004, 11:22 AM
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The CD manual gives the idle spec as 630 +/- 20 with the idle speed controller attached, 570 +/- 40 with the idle speed controller detached. Knob at position 4 in both cases.
FWIW, the Klima relay disengages the AC compressor below 600rpm but I don't know how accurate that device is. Sixto 95 S420 87 300SDL
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