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 ShopForum > Technical Information and Support > Tech Help

Reply
 
LinkBack Thread Tools Display Modes
  #1  
Old 10-25-2001, 03:24 PM
jsmith's Avatar
Ronin
 
Join Date: Aug 2001
Location: At Sea
Posts: 1,729
What controls Full Throttle/Kickdown on M104?

I am baffled by the inability of my 93-300e2.8 to hit redline in any gear.

Here are my observed shift points with lever in "D"

shift WOT Kickdown
1-2 3.8k rpm 4.2k rpm
2-3 3.8k rpm 4.2k rpm
3-4 4k rpm 4.8k rpm

With lever in "2'" + kickdown produces 1-2 shift with the highest rpm at 5.2k.

I have adjusted the bowden cable which moves the shifts points at less than but not at WOT or Kickdown. Is this symptomatic of a vacuum leak? What else would prevent the tranny from shifting at or near redline?
__________________
joE
1993 300e-2.8
- gone now <sigh>
"Do not adjust your mind, it's reality that's malfunctioning"
http://banners.wunderground.com/bann...L/Key_West.gif
Reply With Quote
  #2  
Old 10-25-2001, 04:07 PM
Registered User
 
Join Date: Mar 1999
Location: Suwanee, GA, USA
Posts: 4,712
It does sound like the bowden cable or even the throttle cable is out of adjustment or stretched.
__________________
Benzmac:
Donnie Drummonds
ASE CERTIFIED MASTER AUTO TECHNICIAN
MERCEDES SPECIALIST 11 YRS
Reply With Quote
  #3  
Old 10-25-2001, 04:28 PM
MIKE FREEMAN
Guest
 
Posts: n/a
make sure all valve body mounting bolts are properly tightened,if bolts are ok there is a small allen head adjustment on the right front of the valve body.
turn this screw out,but don't start with large adjustments maybe 1/4 turn at a time.if you go too far the r.p.m. limiter come into play.
these adjustment should only be performed after checking condition of cable and it's adjustment.
m.f.
Reply With Quote
  #4  
Old 10-25-2001, 05:24 PM
jsmith's Avatar
Ronin
 
Join Date: Aug 2001
Location: At Sea
Posts: 1,729
Benzmac,

Both the throttle and bowden had a lot of slack. I've tightened the throttle to max with no effect. When I adjust the bowden it just moves the shift points at part throttle.

Mike,

I'm not sure about where the valve body/screw is. Was just under there looking but not sure what part of the tranny it's in. Where exactly is it? I have the CD manuals for W124 is there a section that describes this?

I have always suspected that the car may have been "de-tuned to protect grandma" as she drove around town...
__________________
joE
1993 300e-2.8
- gone now <sigh>
"Do not adjust your mind, it's reality that's malfunctioning"
http://banners.wunderground.com/bann...L/Key_West.gif

Last edited by jsmith; 10-25-2001 at 08:37 PM.
Reply With Quote
  #5  
Old 10-26-2001, 07:06 AM
David C Klasse's Avatar
CheFrac is Back!
 
Join Date: Jan 2001
Location: Mission Hills in the City of San Diego
Posts: 2,352
JSmith (what is your first name anyway?!),

Did you ever find out what was wrong? Now, it was hitting redline BEFORE you (/we ) started making Bowden cable adjustments? And after fooling with the Bowden cable, the redline changed?

Hmm, I'd be stumped too. No matter the adjustments I've made, I am still able to hit redline... WOT and kick-down haven't changed a bit.
GOOD LUCK and let me know what's going on.
__________________
2006 E350 w/ 155k miles (Daily Driver)

Previous:
1993 300E 3.2L Sedan w/ close to about 300k miles
2003 E500 Brilliant Silver (Had 217k miles when totalled!)
1989 300E with 289,000 miles (had for <1 yr while in HI)
03 CLK 500 cabrio (Mom's)
2006 C230k (Dad's)
1999 S420 (Mom's/Dad's)
2000 C230k Sport sedans
2001 CLK320 Cabrio (Mom's)
1995 C280 My First Mercedes-Benz... (155k miles. EXCEPTIONAL AUTOMOBILE. Was Very hard to let go of!)
Reply With Quote
  #6  
Old 10-26-2001, 07:39 AM
jsmith's Avatar
Ronin
 
Join Date: Aug 2001
Location: At Sea
Posts: 1,729
david,

no, it has never reached redline and none of the adjustments we have made with the bowden cable changed the max rpm's. making the shifts later actually fixed my harsh shifting but the shift points only changed at part throttle as you may also have observed since you still hit redline no matter what.

while we were under there my mech was trying to snap off the modulator cap. i knowingly said that, no that just adjusted the shift feel and not the max rpm and i didn't want him to break the cap off.

i may have to go and get that MB tranny manual i saw in one of the threads just to figure out what mike is talking about.

joe
__________________
joE
1993 300e-2.8
- gone now <sigh>
"Do not adjust your mind, it's reality that's malfunctioning"
http://banners.wunderground.com/bann...L/Key_West.gif

Last edited by jsmith; 10-26-2001 at 07:56 AM.
Reply With Quote
  #7  
Old 10-26-2001, 07:59 AM
David C Klasse's Avatar
CheFrac is Back!
 
Join Date: Jan 2001
Location: Mission Hills in the City of San Diego
Posts: 2,352
Joe Smith (Isn't that original?! ),
The problem must be elsewhere?? I don't know. Hopefully the techs will help you out with this one.
GOOD LUCK!
__________________
2006 E350 w/ 155k miles (Daily Driver)

Previous:
1993 300E 3.2L Sedan w/ close to about 300k miles
2003 E500 Brilliant Silver (Had 217k miles when totalled!)
1989 300E with 289,000 miles (had for <1 yr while in HI)
03 CLK 500 cabrio (Mom's)
2006 C230k (Dad's)
1999 S420 (Mom's/Dad's)
2000 C230k Sport sedans
2001 CLK320 Cabrio (Mom's)
1995 C280 My First Mercedes-Benz... (155k miles. EXCEPTIONAL AUTOMOBILE. Was Very hard to let go of!)
Reply With Quote
  #8  
Old 10-26-2001, 08:01 AM
jsmith's Avatar
Ronin
 
Join Date: Aug 2001
Location: At Sea
Posts: 1,729
thanks, david and no i ain't from utah (someone actually asked me that once).

BTW, has anyone picked up a manual from this place:

http://www.atsgmiami.com/cart/Category.Cfm?Cat=36

Do they have blown up pictures etc.?
__________________
joE
1993 300e-2.8
- gone now <sigh>
"Do not adjust your mind, it's reality that's malfunctioning"
http://banners.wunderground.com/bann...L/Key_West.gif

Last edited by jsmith; 10-26-2001 at 08:24 AM.
Reply With Quote
  #9  
Old 10-26-2001, 09:42 AM
Moderator
 
Join Date: Mar 2000
Location: Gainesville FL
Posts: 6,844
Its especially strange that kickdown doesn't change the shift point much. I would verify that power is available at the kickdown switch (terminals 1 and 2 should be hot without closing the switch). Power comes from the A/C compressor control module (strange as that might seem).

If you get internal, you should verify that the control pressure piston goes full travel when someone floors the throttle. If it does reach full throttle, loosen and retorque the valve body and as Mike said, adjusting the allen screw will change the shift point, about 5mph per turn.

I have seen a couple 300SDLs that exhibited absolutely low shifting. Such that no external adjustments mattered. I fixed both with a valve body. MB provides rebuilt valve bodies so cheap, for most units, that very few techs have ever learned enough to fix them properly. One of those people visited this site for a time from Australia (where they can't buy rebuilt VBs). Another is Mario Arisides in Miami. I wouldn't be surprised if that link above gets you very close to Mario. He has consulted on most ATSG MB projects, (I hear). His business is called Independent Transmission.
__________________
Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician
Reply With Quote
  #10  
Old 10-26-2001, 10:25 AM
jsmith's Avatar
Ronin
 
Join Date: Aug 2001
Location: At Sea
Posts: 1,729
ahhh, thanks Steve! i have been trying to figure out how to test the kickdown circuit. i have tested the switch itself and it appears operational with one pair constant on and the other constant off.

while my local indy is very good, he is really a trained BMW tech not MB. knows quite a bit about benzes and doesn't mind that i do a lot of research prior to coming over. that book may come in handy after all...
__________________
joE
1993 300e-2.8
- gone now <sigh>
"Do not adjust your mind, it's reality that's malfunctioning"
http://banners.wunderground.com/bann...L/Key_West.gif
Reply With Quote
  #11  
Old 11-27-2001, 06:31 PM
jsmith's Avatar
Ronin
 
Join Date: Aug 2001
Location: At Sea
Posts: 1,729
an update:

i have been tracking down leaks in the tranny the past month and found that fluid lines on both sides were leaking. it seems that the seals that were in place were the wrong size and were barely keeping the fluid in. what surprised me was that now it kicks down all the way to second (never did that before) at around 50-60mph and it is shifting quite a bit higher than before at WOT. still not at redline but a marked improvement. i have yet to make careful observations on the new shift patterns. could new tranny fluid have helped - i have about 2k miles with the new fluid. did those leaks have anything to do with the problem?

i'm still having it checked out but this was a surprise...
__________________
joE
1993 300e-2.8
- gone now <sigh>
"Do not adjust your mind, it's reality that's malfunctioning"
http://banners.wunderground.com/bann...L/Key_West.gif
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
My First Post!!! (More...We just purchased a full European 300sl 1986 R107!!) PoloBenz SL Forum 12 09-07-2006 01:34 AM
M104 into 16V ATATEXAN Tech Help 8 09-29-2004 08:21 PM
M104 cold-start problem back! ke6dcj Tech Help 0 08-02-2004 12:41 PM
New AC Servo and Amp, Still Full Heat Elripster Tech Help 2 11-27-2001 10:35 PM
New AC servo and amp, still full heat Elripster Diesel Discussion 0 11-26-2001 09:38 PM



All times are GMT -4. The time now is 06:56 AM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2011 Pelican Parts - Posts may be archived for display on the Peach Parts or Pelican Parts Website -    DMCA Registered Agent Contact Page