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  #1  
Old 12-24-2004, 10:51 PM
rblookc
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Angry 85 300D Late Shifts??

I am getting late shifts in my 300D auto tranny. I need to crank it out to get it to go to fourth, where it will stay momentarily, then it will jump back to third on the highway. This is a sudden thing; wasn't like this before. Fluid ok. Could I have dislodged a vacuem hose or something? I just changed the oil, oil filter, fuel filters and air filter. Downshifts fine (in fact, that's the problem). No slippage yet detected. Just seems to be off all of a sudden. I checked the forum on this and found nada. Thanks for any help in advance.

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  #2  
Old 12-25-2004, 11:01 PM
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Join Date: May 2004
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I will bump you back to the top so someone may see this in the morning.

If you keep the accelerator pedal to the floor does it shift ok?

You say the fluid is ok, has it and the filter been changed within the service interval

You could read about the vacuum control valve if you haven't already.

http://www.peachparts.com/shopforum/showthread.php?t=82748&highlight=control+valve

These are other links I saved on the vacuum system, they do not all apply to your car but I want to be able to find them when I want them.

Quote:
Originally Posted by TwitchKitty
Run some more searches. Understand the separation between your cabin vacuum systems, ACC and central lock and your engine/transmission control systems. Read up on the vacuum control valve, it is a controlled leak to decrease vacuum as you open your throttle. The valve(s) on top of your valve cover work your EGR. Start by measuring how much vacuum your pump will pull.

I saved these links:

http://www.peachparts.com/shopforum/showthread.php?threadid=68484

http://www.mercedesdismantlers.com/diesel_vacuum_system#Diesel%20Vacuum%20System%20Troubleshooting

http://www.peachparts.com/shopforum/showthread.php?t=82748&highlight=vacuum+control+valve

http://www.peachparts.com/shopforum/showthread.php?t=91525&highlight=vacuum+diagrams+dave

http://www.peachparts.com/shopforum/showthread.php?t=105297&highlight=w126+turbo

http://www.peachparts.com/shopforum/showthread.php?threadid=67663

http://www.continentalimports.com/ser_ic20242.html

Last edited by TwitchKitty; 12-25-2004 at 11:12 PM.
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  #3  
Old 12-26-2004, 10:10 AM
TonyFromWestOz's Avatar
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Join Date: Jan 2004
Location: Perth, Western Australia
Posts: 834
Quote:
Originally Posted by rblookc
I am getting late shifts in my 300D auto tranny. I need to crank it out to get it to go to fourth, where it will stay momentarily, then it will jump back to third on the highway. This is a sudden thing; wasn't like this before. Fluid ok. Could I have dislodged a vacuem hose or something? I just changed the oil, oil filter, fuel filters and air filter. Downshifts fine (in fact, that's the problem). No slippage yet detected. Just seems to be off all of a sudden. I checked the forum on this and found nada. Thanks for any help in advance.
Most likely. Check the vacuum lines to the vacuum switches on cam cover, at IP vacuum control valve and on LHS of gearbox.
If unable to find anything, bypass the vacuum control of gearbox by applying full vacuum to gearbox. Shifts should now be early, unless kickdown switch is activated. If this is the case, you have problems with vacuum switches of control valve.
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Tony from West Oz.
Fatmobile 3 84 300D 295kkm Silver grey/Blue int. 2 tank WVO - Recipient of TurboDesel engine.
Josephine '82 300D 390kkm White/Palamino int.
Elizabeth '81 280E, sporting a '79 300D engine.
Lucille '87 W124 300D non-turbo 6 cylinder OM603, Pearl Grey with light grey interior


Various parts cars including 280E, 230C & 300D in various states of disassembly.
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  #4  
Old 12-26-2004, 11:28 AM
rblookc
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yes

yes, when I hold the pedal down it shifts ok. i tried that this morning with the roads covered in early morning snow. neighbors dont like me anymore. why? what does that suggest? thanks for bumping it.
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  #5  
Old 12-26-2004, 12:17 PM
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Join Date: Jul 2001
Location: Woolwich, Maine
Posts: 3,598
rblookc,

Changing the oil filter and working in the area around the injection pump gives you the opportunity to accidentally dislodge a vacuum line here and there. A common event is after changing the oil filter on a 617 or 616 engined auto that the owner will report it won't shut off. There is a cluster of vacuum lines and distribution fittings in the area that can be easily dislodged and can wreak havoc on any vacuum controls under the hood. I would check and recheck all the vacuum connections in the area per the earlier post by TwitchKitty. Good luck, Jim
__________________
Own:
1986 Euro 190E 2.3-16 (291,000 miles),
1998 E300D TurboDiesel, 231,000 miles -purchased with 45,000,
1988 300E 5-speed 252,000 miles,
1983 240D 4-speed, purchased w/136,000, now with 222,000 miles.
2009 ML320CDI Bluetec, 89,000 miles

Owned:
1971 220D (250,000 miles plus, sold to father-in-law),
1975 240D (245,000 miles - died of body rot),
1991 350SD (176,560 miles, weakest Benz I have owned),
1999 C230 Sport (45,400 miles),
1982 240D (321,000 miles, put to sleep)
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  #6  
Old 12-27-2004, 05:36 PM
rblookc
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This has to be what is up, but I dont have a diagram of the 617 vacuem system,! The line with the prefilter looking filter gadget (right near the oil filter) is totally detached from whatever it was attached to behind the grommet toward the cabin. I cant find the right line to the tranny. I know some things about this engine, but vacuem is uncharted for me. I will read some threads, but if anyone knows of diagrams on threads, or some local knowledge/trustworthy mechanics in Boston area, please let me know. I need to learn what goes where. This is really frustrating. I also detached about a year ago the lines to the interior locks because they were half working, so I have detached lines and such. It's a bloody hose salad.

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