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 > Tech Help

LinkBack Thread Tools Display Modes
Old 10-24-2017, 07:45 PM
Join Date: Oct 2017
Location: Houston, TX
Posts: 2
1990 Mercedes 300E over-speeding

Driving 50-60 miles per hour, the car will increase RPMs all the way to the red line and car will slow down. When de-accelerating, the RPM will come down very little and the car will stop properly and can be turned off, restarted and the car returns to normal.

This happens quite regularly. I'm trying to find what the problem is and what I need to do to fix it.

Thanks for any help you can provide.

John Baldwin
281 578 9118

Reply With Quote
Old 10-24-2017, 07:53 PM
Registered User
Join Date: Feb 2011
Location: Modesto CA
Posts: 2,961

Does the problem occur only when the Cruise Control is engaged?
Reply With Quote
Old 10-24-2017, 10:08 PM
sixto's Avatar
smoke gets in your eyes
Join Date: Jun 2000
Location: SF Bay Area
Posts: 20,794
Transmission is slipping?

98 E320s sedan and wagon
Reply With Quote
Old 10-25-2017, 05:08 AM
Benz300's Avatar
Benz Enthusiast
Join Date: Sep 2003
Location: new jersey, usa
Posts: 804
probably transmission is slipping. how many miles and when was the last time you had the trans fluid changed ? on the 2000 onwards models the transmission electornic conductor plates can be replaced and the problem is cured. not sure if your trans has the conductor plate.
Whether you think you can or cannot, Either way you're right!. by Henry Ford.
Reply With Quote
Old 10-25-2017, 09:37 AM
Diseasel300's Avatar
Registered User
Join Date: May 2016
Location: Texas Hill Country
Posts: 5,188
So this is a 1990 car which means it's going to have a 722.3 or 722.4 transmission in it. No electronics or conductor plate to worry about.

To clarify with the OP - is the engine running up in speed but the car is staying the same or slowing down?

Or is the engine running up in speed and the car is also increasing in speed and you have difficulty slowing it down?

If the prior, you have transmission problems - likely low or burned fluid or internal wear causing slipping.

If the latter, you need to see if you have a linkage sticking somewhere or tell us if you're using cruise control when the behavior happens.

Since the transmission is mechanical, if you're having transmission slippage then the stopping and restarting behavior is only coincidental. You pull over long enough for things to cool down and stop the slipping temporarily.
'11 Honda Accord EX - "The Daily" 70K
'83 500SL Euro - "The Money Pit" 116K
'91 350SD - "Diseasel Jr." 173K
'94 BMW 525i - "The Red Car" 180k
Reply With Quote
Old 10-25-2017, 08:18 PM
Join Date: Oct 2017
Location: Houston, TX
Posts: 2
Replay Transmission Problem 300E overspeeding

Thanks for the advice. I am going to take it in and have the transmission fluid drained, change the filter, etc. Thanks for the on-target answers, Diseasel300. Your comments were right on..."To clarify with the OP - is the engine running up in speed but the car is staying the same or slowing down?"

I appreciate your help

John Baldwin

Reply With Quote


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 11:06 PM.

Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2020, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2018 Pelican Parts, LLC - Posts may be archived for display on the Peach Parts or Pelican Parts Website -    DMCA Registered Agent Contact Page