Throttle Linkage Damper on 240D
 

Hello,
In the process of removing EGR-related components, I noticed that there were some missing pieces in my throttle linkage. I have ordered a pair of bushings (#76) thanks to the recent thread which brought their existence to my attention. I'm also missing the damper, #21 in the diagram below. The car seems to have run fine for the last year without it; does anyone know exactly what the function of the damper is and how crucial it might be to replace? I'm going to check out a parts car this weekend, so I might have the chance to pick one cheap. If I can't get a used one, and it's an important part of the linkage, I guess I'll have to head to the stealership. Please advise.

Thanks,
Nate

Can't answer your questions, but if those bushings you get turn out to be the right part, let me know the part number please. I have tried to get them twice and both times I ordered what I thought was the right part number, but it wasn't the right part.

Len
'83 240D

They are part number 202-301-00-93... I got the information from this thread.

Nate

there are two of those throttle guide bushings btw..

I put the number in Rustys search without the dash in between number and the part shows the correct part .. are they sending you the wrong one?

I ordered them from FastLane.

Did replacing the dampener make any difference?

Today my idle was very high, and upon investigation I discovered that the dampener (#21 in the diagram above) had come out of it's lower ball & socket joint and was jammed under the throttle linkage.

I removed it, and it's shot.

How critical is this thing...?

- Patrick

damper
 

i think the damper is related to emissions and not crutial to ordinary operation. i just had my rebuilt 240d engine installed in another 240d same year and somehow the wrong damper got fitted. it was too long and restricted the throttle travel. my mechanic called in a panic wanting to change the injector pump, etc. he said the car wouldnt go over 30... which is too slow even for a 240. i told him it couldnt be the ip and to look at algae in the tank and the filters, etc all the simple things. he called back later and said he discovered that this little shock absorber thing was too long. so we threw it away. and now the 240 is really fast... well you know, like a 240 is. ..more than 30.

Hi Nate,

Could you pls. tell me your source for the parts diagram (also a list of part names to match the numbers)? I'm trying to find out the names of the linkage parts which connect from the valve cover to the air intake on the passenger side. I don't think I saw this parts diagram in the skinnerbox site.

the dampner has nothing to do with emissions, it is simply a linkage that has a moveable section to prevent engine vibrations from affecting the position of the accelerator pedal. I have some dampners, but what application they were from I can't tell, but if one knew the right length I would measure them. These came in at least two lengths and were used on gassers too. It can be bypassed with a straight section with ball joints if you have one with little problem, just you might feel your pedal moving up and down if your engine is not running smoothly.

It is critical NOT to let anything get jammed under the other linkage, that can lead to a runaway engine, or worse.

jsp, the throttle linkage diagrams are available at the skinnerbox site, under section 30, accelerator control.

Replacing the damper didn't really seem to do much; I don't think it's a critical component of the linkage system. The car ran fine without it for the first year I owned it. However, replacing the throttle guide bushings made a huge difference; eliminating the extra play from that part of the linkage made the pedal feel much more responsive.

Nate

I have since replaced mine.

Hard to find - gave up and bought it from the "source of last resort" - the dealer$hip. $70. Ouch...

I can't tell if it makes a difference or not.

I figured that since the MB engineers put it there originally, then it must be worth having. The way I see it, if a company can save even a nickle per car by virtue of NOT having a piece on it, then they'll save that nickle (unless it buys them a "feature" their marketing department can tout).

- Patrick

If you've got an unusually sluggish (emphasis on UNUSUALLY) 240D, check to see if these throttle guide bushings are missing. I'm out in California visiting my parents and drove their 1982 240D yesterday...I could not believe how low on power the car was. Upon stopping the car and opening the hood, I noticed that when I floored the accelerator pedal (yes, with the engine off...), the throttle linkage only depressed the injector pump lever about one-third of the way. Sure enough...both throttle guide bushings were missing, resulting in way too much free play in the throttle linkage. I stopped by the dealership, picked up two, spend all of 30 seconds installing them and, voila, the car is back to "normal". :D

Check your throttle guide bushings out!

I have this exact problem on my 82 240D, and called the Downtown LA dealer yesterday to find out they have two in stock. I hope you didn't buy them from the same dealer!