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#1
04-25-2007, 02:12 AM
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1985 300SD - won't shut off
I have a 1985 300SD Turbo Diesel that recently won't let me shut it off. I now have to shut it off manually under the hood. I heard it was a vacume problem with the ignition, but the door locks and other vacume system components seem fine - anyone know how to fix?
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#2
04-25-2007, 05:53 AM
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Mine will do this if I accidentally bump a certain vac line loose under the hood. For me, it happens where the check valve is, back by the firewall and master brake cylinder. You can eye ball it... Mine is an 82 300D so maybe different with an SD, but I doubt it.
-Chuck
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 1982 300D, anthracite grey, 260k miles, Greasecar 1999 E300D, black, 160k miles, Greasecar 2010 Honda Insight Hybrid http://www.chuckwyatt.com http://www.wordimpressive.com
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#3
04-25-2007, 02:44 PM
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I also has this problem on my '82 300. I disconnected the yellow check valve, engine now shuts off, door locks no longer are powered, yet work manually.
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83 SD 84 CD
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#4
04-25-2007, 02:57 PM
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You have a vacuum leak somewhere. Use a mity vac to test the shutoff valve at the back of the injection pump, then test the other legs of the system for leaks.
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1979 240D- 316K miles - VGT Turbo, Intercooler, Stick Shift, Many Other Mods - Daily Driver 1982 300SD - 232K miles - Wife's Daily Driver 1986 560SL - Wife's red speed machine
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#5
04-25-2007, 03:00 PM
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Trace the shut down circuit. This one does go through the ignition switch also, and is easy to knock loose if you have been poking around under the dash.
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RRGrassi 70's Southern Pacific #5608 Fairmont A-4 MOW car 13 VW JSW 2.0 TDI 193K, Tuned with DPF and EGR Delete. 99 W210 E300 Turbo Diesel, chipped, DPF/Converter Delete. Still needs EGR Delete, 232K 90 Dodge D250 5.9 Cummins/5 speed. 400K Gone and still missed...1982 w123 300D, 1991 w124 300D
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#6
04-25-2007, 03:51 PM
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I have an 83 300 SD. The vacuum for the door locks is a separate pump (electric pump) in the trunk.
My 240D would not shut off at one point. As opposed to a vacuum leak, it was a vacuum line that was clogged with some goop.
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Sunny PA 79 240D 83 300SD
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#7
04-25-2007, 04:44 PM
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Get a length of rubber vacuum hose and attach it to the shut off valve on the back of the injection pump in place of the existing vacuum hose. With the engine running, give a couple of big sucks on the hose. If the engine shuts down, the shut off valve is working and there's a vacuum problem elsewhere. If it doesn't shut down, and particularly if you get a mouthful of oil when you suck, the shut off valve has failed and needs to be replaced.
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1977 300d 70k--sold 08 1985 300TD 185k+ 1984 307d 126k--sold 8/03 1985 409d 65k--sold 06 1984 300SD 315k--daughter's car 1979 300SD 122k--sold 2/11 1999 Fuso FG Expedition Camper 1993 GMC Sierra 6.5 TD 4x4 1982 Bluebird Wanderlodge CAT 3208--Sold 2/13
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