Parts Catalog Accessories Catalog How To Articles Tech Forums
Call Pelican Parts at 888-280-7799
Shopping Cart Cart | Project List | Order Status | Help



Go Back   PeachParts Mercedes-Benz Forum > Mercedes-Benz Tech Information and Support > Diesel Discussion

Reply
 
LinkBack Thread Tools Display Modes
  #1  
Old 04-03-2005, 02:07 PM
lietuviai's Avatar
Registered User
 
Join Date: Mar 2003
Location: SW WA
Posts: 5,744
Lightbulb Anyone have this transmission problem, this may be the solution for it

Every now and then when I floor my '85 300D, it downshifts but then refuses to upshift. It was an intermittent problem and I thought since mine was a CA emissions model I thought it was something in the egr computer. I even had a switch wired into the "secret" fuse located behind the glove box so everytime the tranny would stick, I could just switch it off and it would shift fine. Then I read somewhere in a post that there was a kickdown switch under the accelerator pedal. I never knew there was that there even was a switch like it. I had the problem again recently and this time I remembered to check out this switch. It indeed was sticking on occasion. So...if you ever have a problem like it won't shift, check out the switch. It may save you an expensive trip to a transmission mechanic.

__________________
DJ


84 300D Turbodiesel 190K with 4 speed manual sold in 03/2012

Last edited by lietuviai; 04-05-2005 at 11:05 PM.
Reply With Quote
  #2  
Old 04-03-2005, 07:00 PM
Banned
 
Join Date: May 2002
Location: Blue Point, NY
Posts: 25,396
I have to laugh at this post.

I have been troubleshooting a problem for a new member for almost three weeks and he was determined to find the problem in the vacuum system on an '85 CA 300D. It's a completely different system from all other 123's. So, after we go over it thoroughly, I realize that his problem is not the vacuum system at all.

The damn thing won't upshift.

So, I suggest that he disconnect the kickdown switch and what do you think happens??

He was quite shocked about the whole thing.

Damn switch almost caused another member down in Texas (IIRC) to sell the vehicle.
Reply With Quote
  #3  
Old 04-03-2005, 07:13 PM
lietuviai's Avatar
Registered User
 
Join Date: Mar 2003
Location: SW WA
Posts: 5,744
I don't think a vacuum problem would ever affect the tranny on an '85 model, at least not in any way that would prevent it from shifting.
__________________
DJ


84 300D Turbodiesel 190K with 4 speed manual sold in 03/2012
Reply With Quote
  #4  
Old 04-03-2005, 07:57 PM
Banned
 
Join Date: May 2002
Location: Blue Point, NY
Posts: 25,396
Quote:
Originally Posted by lietuviai
I don't think a vacuum problem would ever affect the tranny on an '85 model, at least not in any way that would prevent it from shifting.
.........................you got that right, LOL.
Reply With Quote
  #5  
Old 04-04-2005, 10:07 AM
rblookc
Guest
 
Posts: n/a
Quit making fun of me

I do think though that the Vac can affect things, as when you pull the Vac line things get a bit nutz. But maybe not so much shift timing. I got that 85 CA vac system PEGGED though.

How do you switch out the kickdown switch? Just a couple o' nutz or is it a twisty of sorts. Be nice to have an idea before I go crawling around in the slush.
Reply With Quote
  #6  
Old 04-04-2005, 10:18 AM
Banned
 
Join Date: May 2002
Location: Blue Point, NY
Posts: 25,396
Quote:
Originally Posted by rblookc
Quit making fun of me

I do think though that the Vac can affect things, as when you pull the Vac line things get a bit nutz. But maybe not so much shift timing. I got that 85 CA vac system PEGGED though.

How do you switch out the kickdown switch? Just a couple o' nutz or is it a twisty of sorts. Be nice to have an idea before I go crawling around in the slush.
We are not making fun of you. It's kind of like deja vu where this damn switch has returned to strike another member with the wrath of the transmission Gods.

Kinda trying to make light of the situation. You've done an excellent job of methodically working the problem diligiently until you found the culprit. If I was aware of the how late the shifts were, we could have avoided most of that. I was thinking the shifts were 500-1000 rpm late, as an example. Actually, they were at or near redline. A different set of data!

The benefit is that you now know much more about the vacuum and boost systems than you ever did. It will benefit you in the future.

I've never pulled the switch, myself, so I can't guide you there. If I had to guess, I would say that M/B would use two or three fasteners to hold it to the floorpan.
Reply With Quote
  #7  
Old 04-04-2005, 12:10 PM
rblookc
Guest
 
Posts: n/a
Nah, I was just kidding. You can make fun of me, even if you havent already. You gave alot of your time to help me; in my mind it kinda gives you special license!! If anyone else has tips of wrenching one of those switches out, let me know. You know, during the ghost chasing I snapped one of the nipples off my brake booster line (where it delivers vacuum). Now I have a shiny new one to remind me of my cold winter evening adventures through my vac system in the near dark. I wake with cold sweats still. Unnecessary engine carnage is part of DY work I guess.
Reply With Quote
  #8  
Old 04-04-2005, 01:38 PM
Old Deis
Guest
 
Posts: n/a
Not sure if the 85 is wired the same as the earlier models, but the kickdown on mine has a single lead that plugs into the rear of the tranny. Maybe just unplug for a quick check? Could be worth a shot.
Reply With Quote
  #9  
Old 04-04-2005, 01:44 PM
Banned
 
Join Date: May 2002
Location: Blue Point, NY
Posts: 25,396
He's already confirmed that he has a bad switch. The question is how to R&R the switch, if anyone has done it.
Reply With Quote
  #10  
Old 04-04-2005, 08:47 PM
Registered User
 
Join Date: Jul 2004
Location: Annapolis, Md.
Posts: 556
If you are just talking about the switch under the pedal on the floor??? There are two plastic tabs on each side of the switch. Press them together against the switch and it comes out of its little home.
__________________
-disav

99 E300 TURBODIESEL Astral Silver 282K - AMG brakes, suspension, monoblocks, speedo & interior - Full Load Maxed on IP by custom Speed Tuning USA Chip - T3/T4 Garrett - EGR/MAF delete
98 E300 TURBODIESEL Alexandrite Green on black leather 289K
95 E300 DIESEL Green Queen 267K SOLD
84 300D 216k SOLD
87 300D 299K #22 head - intercooler - full load adj. - 8sec 0-60mph - SOLD
76 300D 214K SOLD
Reply With Quote
  #11  
Old 04-04-2005, 09:08 PM
Johnhef's Avatar
Senior Member
 
Join Date: Feb 2005
Location: Frederick, Md
Posts: 4,540
This is definitly interesting, I had never thought that it would stick. On rare occasion mine won't shift from 1-2 (was actually one of the two reasons I ovehauled the trans, it still did it after rebuild), holding at its max rpm for a good couple seconds before finally lurching into the next gear. It happens so few and far between, I've never had the chance to troubleshoot it, now I know what to check for, thanks!
__________________


1980 500SE/AMG Euro
1981 500SEL Euro
1982 380SEL
1983 300TD
1983 500SEC/AMG Euro
1984 500SEC
1984 300TD Euro
1986 190E 2.3-16
1986 190E 2.3
1987 300D
1997 C36 AMG
2003 C320T 4matic

past: 1969 280SE 4.5 | 1978 240D | 1978 300D | 1981 300SD | 1981 300SD | 1982 300CD | 1983 300CD | 1983 300SD | 1983 380SEC | 1984 300D | 1984 300D | 1984 300TD | 1984 500SEL | 1984 300SD | 1985 300D | 1986 300E | 1986 560SEL | 1986 560SEL/Carat | 1987 560SEC | 1991 300D 2.5 | 2006 R350
Reply With Quote
  #12  
Old 04-05-2005, 07:55 PM
rblookc
Guest
 
Posts: n/a
Thanks. Sounds simpler than spending three weeks tearing through a vac system.
Reply With Quote
  #13  
Old 04-05-2005, 09:56 PM
Banned
 
Join Date: May 2002
Location: Blue Point, NY
Posts: 25,396
Quote:
Originally Posted by rblookc
Thanks. Sounds simpler than spending three weeks tearing through a vac system.
But.........it's an education.
Reply With Quote
  #14  
Old 04-05-2005, 10:28 PM
lietuviai's Avatar
Registered User
 
Join Date: Mar 2003
Location: SW WA
Posts: 5,744
Quote:
Originally Posted by rblookc
Thanks. Sounds simpler than spending three weeks tearing through a vac system.
I think that's the mission of this forum, finding easy solutions.

__________________
DJ


84 300D Turbodiesel 190K with 4 speed manual sold in 03/2012
Reply With Quote
Reply

Bookmarks

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On
Trackbacks are On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
Transmission problem and question Hector111 Diesel Discussion 8 08-21-2005 08:42 AM
'81 300D Transmission problem, flare 2-3 davidhoward Diesel Discussion 8 04-11-2005 11:07 AM
Transmission problem Ironhead Diesel Discussion 8 03-27-2005 10:35 AM
Manual transmission problem !!!!!! Bige Tech Help 2 11-23-2002 05:27 PM
Transmission problem on 98 ML320? 1994C220 ML, GL, G-Wagen, R-Class, Unimog, Sprinter 1 02-19-2002 02:57 PM



All times are GMT -4. The time now is 07:02 AM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2024, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2024 Pelican Parts, LLC - Posts may be archived for display on the Peach Parts or Pelican Parts Website -    DMCA Registered Agent Contact Page