Author Topic: 1969 280SL engine shut-off  (Read 1905 times)

TBaker

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1969 280SL engine shut-off
« on: November 16, 2020, 19:15:40 »
Recently when I turned the ignition off, the engine and fuel pump continued to run and the only way I could get them to stop was by shutting the driver side door or pushing the door button.  Any idea what is going on?

CJHenderson

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Re: 1969 280SL engine shut-off
« Reply #1 on: November 16, 2020, 19:46:47 »
Is it possible that that you have a loose wire in the steering column?
1970 280SL/8 W113 101624 miles.
1950 MG-TD
2021 Harley Davidson CVO Trike

Benz Dr.

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Re: 1969 280SL engine shut-off
« Reply #2 on: November 16, 2020, 21:18:42 »
The light for your door and the low-level warning on your brake fluid canister is on the same circuit. Pacing a diode on the circuit will fix that.
1966 230SL 5 speed, LSD, header pipes, 300SE distributor, ported, polished and balanced, AKA  ''The Red Rocket ''
Dan Caron's SL Barn

1970  3.5 Coupe
1961  190SL
1985   300CD  Turbo Coupe
1981  300SD
2013  GMC  Sierra
1965  230SL
1967 250SL
1970 280SL
1988 560SEC

Iconic

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Re: 1969 280SL engine shut-off
« Reply #3 on: November 17, 2020, 13:14:18 »
Dan, Isn't it also true that if TBaker adds the correct amount of brake fluid, the issue will be gone as long as the circuitry is "correct" and working as intended?
Take care,
Mark
1970 280 SL Automatic, USA version, Grey-Blue (906G/906G), Blue leather (245)
1968 SS396 Camaro Convertible (owned since 1977 -- my first car :D)
1984 Porsche Euro Carrera coupe, LSD, SlateBlueMet/Blue
1998 BMW M-Rdstr Estoril Blue
1970 280 SL Automatic, Anthracite Grey-173G, Red Interior-132 - sold

Benz Dr.

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Re: 1969 280SL engine shut-off
« Reply #4 on: November 17, 2020, 14:59:49 »
Dan, Isn't it also true that if TBaker adds the correct amount of brake fluid, the issue will be gone as long as the circuitry is "correct" and working as intended?
Take care,
Mark

Sure. Sometimes though, that can't be done in a remote location, or the float will become disconnected and/or leak which makes the fluid level warning system inoperative.
1966 230SL 5 speed, LSD, header pipes, 300SE distributor, ported, polished and balanced, AKA  ''The Red Rocket ''
Dan Caron's SL Barn

1970  3.5 Coupe
1961  190SL
1985   300CD  Turbo Coupe
1981  300SD
2013  GMC  Sierra
1965  230SL
1967 250SL
1970 280SL
1988 560SEC

Iconic

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Re: 1969 280SL engine shut-off
« Reply #5 on: November 17, 2020, 15:04:42 »
Thanks Dan.
TBaker, Dan knows his stuff !! Also, this is a well known issue that is covered in many posts.
The search button is your friend.
Enjoy the ride,
Mark
1970 280 SL Automatic, USA version, Grey-Blue (906G/906G), Blue leather (245)
1968 SS396 Camaro Convertible (owned since 1977 -- my first car :D)
1984 Porsche Euro Carrera coupe, LSD, SlateBlueMet/Blue
1998 BMW M-Rdstr Estoril Blue
1970 280 SL Automatic, Anthracite Grey-173G, Red Interior-132 - sold