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  #1  
Old 03-07-2001, 03:08 AM
Lim Lim is offline
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Join Date: Jun 2000
Location: Malaysia
Posts: 55
Hi

I am having an 88 W124 260E. Whilst cruising on a highway with the cruise control engaged, my car will travel smoothly at the set speed, if the highway is flat. However, my car will "jerk" quite noticeably when it travels on every slight decline. My wife always complaint when the jerk happened, as she is very sensitive to motion sickness.

Any remedy for this problem? Any assistance appreciated.

Thanks

Lim
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  #2  
Old 03-07-2001, 01:08 PM
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Join Date: Jan 2000
Location: St. Paul, Minnesota, USA
Posts: 58
do a search on this topic...a number of us have experienced this. It's possibly the amp, or (as I was told once in here) potentially a throttle control needing adjustment.

My garage replaced the cruise control switch, which did nothing (although they swore it was defective). I'm in storage now, but plan to get it fixed when the snow melts.
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  #3  
Old 03-07-2001, 01:16 PM
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Location: Charleston, SC
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You can also try lubricating the throttle linkage. I had the same problem and this suggestion seemed to fix it.

ED C.
1988 300TE 143k
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  #4  
Old 03-07-2001, 08:17 PM
Lim Lim is offline
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Location: Malaysia
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Thanks for the replies. I have done a search on cruise control, and most are having different cruise problems from mine.

Lubricating the throttle linkage is one of the steps that I am going to try on my car. I post this question is to find out what more to look for. My cruise control presently works all the time (I think this will rule out the cruise amp problem)

Ed C, how do you lube the throttle linkage?

Thanks in advance

Lim

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  #5  
Old 03-07-2001, 08:48 PM
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Location: Denver, CO, USA
Posts: 46
Actually, I have a similar problem in an '89 190E 2.6. I've had the car a little less than two years. It has always had a subtle trailing-throttle "hunt" condition when in cruise. This has not been too objectionable. Lately, though, the cruise will exhibit a much more dramatic cut-out, cut-in behavior that doesn't seem to be tied to any particular throttle position and isn't consistent (doesn't happen all the time). A couple of times this has been so extreme that the cruise has actually turned itself off.

I'll try the throttle lube, but have been considering a full resolder of the cruise amp as well. If anyone's had this experience would appreciate some comments. Thanks
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  #6  
Old 03-08-2001, 12:12 AM
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Lim - I just got off the phone with my mechanic about your problem and on whether its a good idea to lube the throttle linkage. He said its only 50-50 that may work. He however said its better not to try doing it as it may jam the cruise control and thus causing the brakes not to respond. He cited 2 cases of this happening, 1 at the highway where the cruise control refuse to disengage even when brakes were depressed; and 2. at C&C where his brother (a tech. there) had to turn of the ignition key and pull the car over.

I will however, still ask around as I am not familiar with this problem.
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  #7  
Old 03-08-2001, 12:58 AM
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JCE JCE is offline
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YMSin:
C&C? Cycle and Carriage?
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  #8  
Old 03-08-2001, 01:41 AM
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JCE - yup, C&C = Cycle & Carriage.
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  #9  
Old 03-08-2001, 09:50 AM
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Lim,

I don't have time to look it up for you, but I seem to remember that someone has a page somewhere that walks you through the resolder process...it may be a reply...am surprised that your search didn't turn it up.

Sounds like a potential DIY for someone with a fine soldering iron and a steady hand.

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  #10  
Old 03-08-2001, 10:04 AM
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Join Date: Apr 2000
Location: Indianapolis
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Our 89 300TE exhibits this behavior on and off.

Check out this site, good technical info and they can fix it too. No affiliation, and no experience with them, just a company that looks like it can help.

http://www.gdl-online.com/begin.html

Brian
89 300TE 165,xxx
84 733i 5speed 145,xxx
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  #11  
Old 03-09-2001, 08:02 AM
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Join Date: Feb 2001
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Came across this that might be of some direction ...

http://www.mbca.org/MBCA_Troubleshooting_cruise_cont.htm
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  #12  
Old 05-19-2002, 12:41 PM
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The first thing you need to check is the front and rear flex disc. They connect the drive shaft to the transmission and rear axle. I had the same jerking problem, but when I replaced the flex disc, the problem was gone. When the flex disc goes bad, it loosens the drive shaft from the transmission and rear axle and the "brain" of the car does not know exactly how fast the car is going, so it jerks.

Matt
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  #13  
Old 05-19-2002, 06:58 PM
Swedish Diesler
 
Join Date: Jan 2002
Location: Sweden
Posts: 106
You should also take a good hard look at your speedometer needle when going at highway speed so that it is absolutely solid in it's position.
Do this without the cruise engaged.


Even the slightest motion of it indicates a worn speedocable and this is causing the cruise to adjust the throttle up/down all the time based on the wrong values.
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  #14  
Old 05-20-2002, 01:46 AM
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Location: San Antonio, Texas, USA
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You must clean and lube the throttle linkage. It is one of the periodic maintenance items. Lubing a faulty linkage won't make it worse as often as the over looked promlem will.

Dirty linkage is the first item to rule out. It helped my periodic down hill problem for a short time, but finally became jerky down every hill.

I had a very bad flex disk, but repair had no effect on frequency of jerks.

Rebuilt control fixed the problem. I believe the MB fix of re soldering the circuit board will fix most controls, if one has the skill and patience to do so. Or $$ to replace, as I did.
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