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 12-21-2002, 02:04 PM
gfdent's Avatar
Registered User
 
Join Date: Aug 2002
Location: Maryland, USA
Posts: 24
Question S320 Transmission stays in second gear too long

When I start my 96 S 320 let it warm up for a couple of minutes and drive off, the car will shift fine to second gear, but will not shift into 3rd gear for some time. Either, the RPMs have to reved pretty high inorder for it to shift to 3rd, or the engine has to be warmed up a lot longer, maybe ~ 8minutes. after a good warm-up it shifts to 3rd ok.

Is this normal or does this sound like I may have transmission problems evolving?
Reply With Quote
  #2  
Old 12-21-2002, 03:05 PM
Registered User
 
Join Date: Apr 2002
Location: Surrey, Uk
Posts: 254
It is normal. The reason for it is to help the catalytic convertor heat up faster, prolonging its life and reducing emisions.
__________________
Mick J
'08 Chrysler 300CRD (MB OM 642 engine)
'95 E220 estate
'89 230TE (R.I.P.)
Reply With Quote
  #3  
Old 12-21-2002, 03:23 PM
Moderator
 
Join Date: Dec 2001
Location: Southern California, U.S.A.
Posts: 8,508
Yep, completely normal.

Your car has an upshift delay valve which delays the shift from 1st to 2nd gear to warm up the cat quicker to reduce emissions.
__________________
Paul S.

2001 E430, Bourdeaux Red, Oyster interior.
79,200 miles.

1973 280SE 4.5, 170,000 miles. 568 Signal Red, Black MB Tex. "The Red Baron".
Reply With Quote
  #4  
Old 12-21-2002, 04:06 PM
gfdent's Avatar
Registered User
 
Join Date: Aug 2002
Location: Maryland, USA
Posts: 24
Smile

Thanks for the information,

I'll make sure I warm the car up before moving. I noticed if I let the temperature guage move just slightly the car shifts ok.
Reply With Quote
  #5  
Old 12-21-2002, 07:54 PM
Registered User
 
Join Date: Jun 2002
Location: Melbourne, Australia
Posts: 80
Angry upshift delay valve

Please tell me how I can remove this "brilliant invention" for good so that there won't be anymore of this delay in the gear shifts when we go out every morning. Its a curse and torture to have to wait for this thing to go its course every morning like an oldie waking up. If you try to quicken this up by stepping harder on the gas, the car struggles, make lots of noise and you get a real stiff kick in the backsides when it finally decides to change. If you let it take its course, the knock won't be so hard. However we have to negotiate this steeper slope every morning and HAVE to step hard on the accelerator to get up and over it, no choice.
Reply With Quote
  #6  
Old 12-22-2002, 01:24 AM
Christian
Guest
 
Posts: n/a
I dont think that its possible to change this feature. Why would you want to? Its the best way to heat up the cat converters and keeping them in good order. I was thinking, an S320 shouldnt have troubles going up a hill when its cold! I have a 94 E280, when I turn it on in the morning stone cold, it idles high for about 30seconds then goes to normal idle. i drive off up a hill everyday too and its fine

Chris

300TE
E280
Reply With Quote
  #7  
Old 12-22-2002, 04:07 AM
Registered User
 
Join Date: Jun 2000
Location: Near Williamsburg, Virginia
Posts: 359
gfdent

Just get in the car, drive-off and it will warm up quicker driving it. You don't need to sit there idling it. If it is so cold you need to idle it before driving off then you need a block heater.
Reply With Quote
  #8  
Old 12-22-2002, 05:55 AM
Registered User
 
Join Date: Apr 2002
Location: Melbourne, Australia
Posts: 280
Angry delayed shift

Christian, I am sure that you will agree that there must be some other better or best way to do the job of preheating the cat without this unfortunate delayed shift and hard knock as it does it. Tell me why nobody has followed this wierd way if it is really necessary(to preheat the cat for whatever reason) and why nobody is complaining about this crazy invention in any other car? Thats because they had better engineers who thought of better ways thats why. So simple. Their most important requirement was for a smoothly changing gearbox all the way. Nothing else was to get in the way.
Reply With Quote
  #9  
Old 12-22-2002, 08:43 AM
Christian
Guest
 
Posts: n/a
What do u mean hocky...are u saying that mercedes did the right thing by doing what they did with this? like holding the gear when its cold to warm it up?
Reply With Quote
  #10  
Old 12-22-2002, 09:52 AM
Registered User
 
Join Date: Jul 2002
Location: Dallas
Posts: 330
Other cars do it. My mom's 740i, my dad's Tahoe, what else? It is almost an industry standard. BTW, my car does it, too.
Reply With Quote
  #11  
Old 12-22-2002, 12:07 PM
Registered User
 
Join Date: Jun 2000
Location: Near Williamsburg, Virginia
Posts: 359
Shortly this preheat of the cats to get them operating will be passe. NASA has developed a cat that works almost immediately at startup. It should make it into automobile production in two to three years.

I've noticed that my wife's E320 holds in gear until she exceeds 30 mph or the temp gets up to x degrees.
Reply With Quote
  #12  
Old 12-22-2002, 12:47 PM
Registered User
 
Join Date: Apr 2002
Location: Surrey, Uk
Posts: 254
If you want to disable this 'feature' just disconnect the plug from the solenoid valve with the green vacuum lines connected to it.

This will cause a fault code to register in the engine management ECU as it checks to see if the solenoid is connected, but it shouldn't have any other effects.
__________________
Mick J
'08 Chrysler 300CRD (MB OM 642 engine)
'95 E220 estate
'89 230TE (R.I.P.)
Reply With Quote
  #13  
Old 12-22-2002, 12:50 PM
mplafleur's Avatar
User Friendly
 
Join Date: Sep 2001
Location: Lathrup Village, Michigan
Posts: 2,939
I for one don't think it's right. On mine, the delay between the 2-3 shift can be three or more seconds. If I ease up on the throttle, I can get it to shift smoother. It will do this as long as the engine temp is under 60 deg C. If the temp gets to 60 or more, the shift is perfect.

None of my other Mercedes have done this.
__________________
Michael LaFleur

'05 E320 CDI - 86,000 miles
'86 300SDL - 360,000 miles
'85 300SD - 150,000 miles (sold)
'89 190D - 120,000 miles (sold)
'85 300SD - 317,000 miles (sold)
'98 ML320 - 270,000 miles (sold)
'75 300D - 170,000 miles (sold)
'83 Harley Davidson FLTC (Broken again) :-(
'61 Plymouth Valiant - 60k mikes
2004 Papillon (Oliver)
2005 Tzitzu (Griffon)
2009 Welsh Corgi (Buba)

Reply With Quote
  #14  
Old 12-23-2002, 06:43 PM
Registered User
 
Join Date: Apr 2002
Location: Melbourne, Australia
Posts: 280
Angry delayed shift

Can somebody tell me why the cheap cars don't have this nasty feature? Don't they all have cats now, especially with the petrol injected engines? My Toyota Camry and Toyota Corolla start off and change like a knife cutting through soft butter! No waiting period, none of the suspense when its going to happen, just off you go like nothings happenned.
Reply With Quote
  #15  
Old 12-23-2002, 06:46 PM
Registered User
 
Join Date: Jun 2000
Location: Saugus, CA USA
Posts: 1,989
I don't have that problem
__________________
5 speed '91 190E 2.6 320,000 mi. (new car, fast, smooth as silk six, couldn't find any more Peugeots)
5 speed '85 Peugeot 505 2.5l Turbo Diesel 266,000 mi. (old car, fast for a diesel, had 2 others)
5 speed '01 Jetta V6 (new wifes car, pretty quick)
5 speed '85 Peugeot 505 2.2l Turbo Gas 197,000 mi. (wifes car, faster, sadly gone just short of 200k )
5 speed '83 Yamaha 750 Maxim 14,000 mi. (fastest)
0 speed 4' x 8' 1800 lb Harbor Freight utility trailer (only as fast as what's pulling it)
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




All times are GMT -4. The time now is 12:48 PM.


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