1983 MERCEDES 300SD ENGINE WONT SHUT OFF WHEN KEY IS IN OFF POSTION

  • Tiny
  • 2CarPros-Archives
  • 1983 Mercedes Benz 300sd
  • 5 CYL
  • 2WD
  • automatic
  • 155,000 miles

1983 Mercedes 300SD 5-cyl Diesel mileage: 155,000. The engine will not shut off when key is turned to off position. Also, braking is very weak and right electric window will not go down. This all happened the same day at the same time. Vacuum system? I tested the vacuum pressure with a gauge but what is a good reading? Also, I checked vacuum lines for damage or leaking. Am I on the right track or is it something else?

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Monday, November 22nd, 2010 AT 7:04 PM

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  • Tiny
  • 2CarPros-Archives
  • Member

Yes, you are on the right track. You probably have a vacuum leak somewhere. The vacuum pump should have approximately 20 to 25 inches of vacuum.

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Monday, November 22nd, 2010 AT 7:06 PM

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