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Old 11-25-2009, 01:37 PM
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Join Date: Oct 2009
Location: Palm Beach Gardens
Posts: 50
Factory recommended idle preset?

Does anyone here have any info on the preset for the Idle on a 1980 450sl
with the Bosch k-jet.

I know that I have the air fuel ratio set to get it to start and run, but it smells like it's running very rich.

When I try to lean it out (turning the screw counter clockwise) it dies before it is lean enough to not smell it or within a few minutes after.

I know there is an idle screw near the front of the engine (big white screw cap with a spring under it.)

I can adjust it and get the car to run again but when I do it's time to start over again with the air fuel mixture.

At one point I had it running at such a slow idle speed the oil pressure was adversely effected. (the oil pressure needle was bouncing between 1 and 2 with the lope of the idle and it idled at around 350 rpm) needless to say I corrected this very quickly so as not to damage the engine.

I know I've read here some where that the idle should be around 700-800 range?

I guess I'm just looking for confirmation from some one who tunes these things often enough to know where my start point should be.

Is there a preset for both points (Idle Screw and Air/Fuel screw) that is recommended as a start point to get this adjusted correctly?

Last edited by panzerwagen80; 11-25-2009 at 01:46 PM.
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Old 11-27-2009, 07:50 PM
Super Moderator
Join Date: Apr 2000
Location: Falls Church, VA
Posts: 5,316
The CD says hot idle should be 650 RPM plus or minus 50. The CO should be .5-1.5%. The idle speed is set first.
Chuck Taylor
Falls Church VA
'66 200, '66 230SL, '96 SL500. Sold: '81 380SL, '86 300E, '72 250C, '95 C220, 3 '84 280SL's '90 420SEL, '72 280SE, '73 280C, '78 280SE, '70 280SL, '77 450SL, '85 380SL, '87 560SL, '85 380SL, '72 350SL, '96 S500 Coupe
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