I have had this 1980 300D for 20 years, but
never had anyplace where I could ask this question.

On the left side of steering column, below the instrument cluster.

There is a black knob, sort of has a head like a key, like you might turn it.
I can't remember, but I think when I pulled it it popped off.

I have never been able to figure out what it is for.

Just last night I was under the dash and tried to follow a cable behind it out of the firewall, it looks like it goes to a cable connected next to the cruise
control connection to the throttle.

Is it some kind of choke ?

Idle speed adjuster - for cold running until temps come up

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89 300E
79 240D
72 Westy
63 Bug sunroof
85 Jeep CJ7
86 Chevy 6.2l diesel PU

"The object of life is not to be on the side of the majority, but to escape finding oneself in the ranks of the insane."
Marcus Aurelius

To operate...before starting...push down the accel pedal and then turn that knob anti-clockwise. Start the car.

You will notice a fast idle...as it warms up...turn the knob clockwise until the engine is at its normal idle.

ALso useful for teaching people how to drive stickshift

It's described in the owner's manual.

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2004 VW Jetta TDI (manual)

Past MB's: '96 E300D, '83 240D, '82 300D, '87 300D, '87 420SEL

When I had my 300D thought that was the cruise control

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BENZ THERE DONE THAThttp://www.peachparts.com/shopforum/...c/progress.gif
15 VW Passat TDI
00 E420
98 E300 DT
97 E420 Donor Car - NEED PARTS? PM ME!
97 S500
97 E300D
86 Holden Jackaroo Turbo D
86 300SDL
(o\|/o)

There is no knob on my 1985 300TD I just went out to my car and looked

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Doug

1987 300TD x 3
2005 E320CDI

Only the non-turbo models have it.

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2004 VW Jetta TDI (manual)

Past MB's: '96 E300D, '83 240D, '82 300D, '87 300D, '87 420SEL