Fuel injection adjustment & transmission shift points - Mercedes-Benz Forum

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post #1 of 4 (permalink) Old 08-16-2006, 08:00 AM Thread Starter
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Date registered: Jul 2006
Vehicle: 1973 280SE 4.5
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Fuel injection adjustment & transmission shift points

Hello again ---
I have two questions for all of you. First, when rotating the knob on the "brain" which controls the gas/air mixture in a 1973 4.5L engine, which way (clockwise or counter-clockwise) is rich and which is lean? Second, is there any adjustment which can adjust the shift points in the automatic transmission in this model (280SE 4.5)? The one I have wants to upshift too early, resulting in what feels like "lugging" all the time.
Thanks for the advice,
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post #2 of 4 (permalink) Old 08-16-2006, 10:17 AM
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The tranny shift points are internal to the tranny, if memory serves. I had mine rebuilt 6 months back and had to have it adjusted (shifted very sloppily) at the shop.
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post #3 of 4 (permalink) Old 08-17-2006, 12:51 PM
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I believe that clockwise is rich. But remember that only effects the mix at idle. You can effect the tranny shift habits with the control rod that comes from the throttle linkage. I have seen these disconnected and the car drives like its all screwed up. Good luck!
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post #4 of 4 (permalink) Old 08-19-2006, 06:37 PM
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Make sure the control rod going down to the trans has good bushings and it is secure at the trans lever. Mine were missing and it upshifted early and I had no passing gear.
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