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#1
09-06-2009, 01:42 PM
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It happened over night??
Okay so I park my 1982 240D that's been driving great. No issues what so ever. Get in my car the following morning, it starts up fine, I drive away and realize that its not shifting as it was. It's an automatic. Overnight the shift points have all changed and it won't shift til the engine sounds like its gonna blow up and it shifts hard too. What happened while it was parked over night??
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1973 280 - Sold 1980 300SD - Sold 1982 240D - Stolen 1988 300E - Sold 1989 260E - Sold 1989 560SEL 1994 E420 - Sold 1997 E420 2005 CL500 
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#3
09-06-2009, 01:47 PM
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No the car does shut off normally. Everything else is fine.
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1973 280 - Sold 1980 300SD - Sold 1982 240D - Stolen 1988 300E - Sold 1989 260E - Sold 1989 560SEL 1994 E420 - Sold 1997 E420 2005 CL500
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#4
09-06-2009, 01:55 PM
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I don't know much about automatics, but first thing that came to my mind was the kick down switch, cause it sounds like it's shifting as if you had the accelerator on the floor. anyone else?
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1983 240D 3.0T 4-speed manual, now sold  1989 Subaru GL Wagon 5-speed Touring Edition
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#5
09-06-2009, 02:40 PM
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My money's on a bad kickdown switch but it could also be a stuck bowden cable. Unplug the kickdown switch and see if the problem goes away.
__________________
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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#8
09-06-2009, 03:25 PM
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some animal may have been climing under there and knocked something loose, also a rat or other rodent could have chewed a vacuum line? just thoughts as i have experienced both.
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1967 250 S 1967 280SE 1968 250S 1971 280 SE 1973 220 1974 280 S 1975 450 SEL 1976 220 D 1979 300SD 1983 300 SD 1985 230 TE euro 1986 280SL 1986 500 SEL euro 1986 190E 2.3 1990 300 SE 2003 C230 K 2004 C230 K 1987 560SEL 1987 300SDL now in canada 2005 C230 1998 C43 AMG Sold to DON 1993 190E 2.6 300TD Former daily driver Totaled current: R320 CDI Ram 2500 Cummins
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#9
09-06-2009, 04:17 PM
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First check the fluid level. Note the color as well as the level.
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"I bought the car brand new off the show room floor. It brought my baby girl home after she was born, but I never thought that one day she'd be driving it to school!" -Dad Resto and 240D to 300D w/ turbo swap in progress
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#10
09-06-2009, 04:54 PM
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I don't know whether there was a difference between '82 and '83; however, I experienced a similar problem in my '83 240D. Turned out that one of the two white vacuum switches on top of the cam cover (mine were concealed by a black plastic box) had a massive vacuum leak. I recall it only being a $30 part at the time.
Sincerely,
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Brian '94 E420 - 99K '12 C300 4 Matic Previously owned: '06 CLK 500K Cabriolet '85 300SD (Old Smokey) 2002 Boxster 2002 C320 (The five-pointed star Mercedes) 1993 300E 3.2 (Dealership's cash cow) 1979 300SD (Chrome beauty) 1983 300D (Old faithful) 1983 240D (Right lane cruiser) 1977 240D (Miracle of bondo)
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#11
09-06-2009, 05:53 PM
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Sounds like a loose vacuum line to me....
Check all your lines, especially the one that goes to the transmission (black).
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#12
09-06-2009, 06:02 PM
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As I understand the system, vacuum does not effect shift points, only shift harshness/softness.
__________________
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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#13
09-06-2009, 06:06 PM
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Quote:
I know it says that on paper, but on both my 240D and 300CD, if I pull the vacuum line and go for a quick drive it will make it shift high and hard. I do believe it could be the bowden cable, but it would have to be "stuck" at it's limit to create high shifts, if it broke or somehow came disconnected it would shift really low and loose. Perhaps the cable needs to be lubed and is stuck inside the sleeving. Im curious to see how this turns out.
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#14
09-06-2009, 06:41 PM
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I don't believe his 240D has a bowden cable. My 83 240D will shift very late with a loss of vacuum. However, if the car had a major vacuum leak it wouldn't shut off.
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#15
09-06-2009, 07:36 PM
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If you have the trans that does not have a bowden cable, then the symptoms you are describing are those of no vacuum to the transmission.
DO NOT continue to drive the car in this condition. My first MB had the same problem and the PO continued to drive it until the tabs on the torque converter hub that drive the front pump sheared off. Check vacuum control line starting at the trans modulator, its probably disconnected somwhere.
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