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  #1  
Old 11-27-2002, 06:12 PM
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Can't give throttle? Motor mounts??!

Hello I’ve been contemplating buying another 300D, there is a 83 that was rear ended and selling for quite cheap (<$1k) but it has a problem that I’d like to know what is causing it before I get to serious about buying it. Almost everything on this car is perfect (other than the obvious damage), but after it was rear ended the throttle can’t rev the motor. Apparently the guy had a mechanic look at it, and while he didn’t find anything definite it was suspected a broken motor mount due to the impact was causing it. Does this sound feasible? I just can’t see how the motor could move so much. Hopefully he can send me a picture of this region of the motor…. It’d be phenomenal if I could fix it and drive it home as is (damage isn’t that bad, both rear quarters are slightly bent and the bumper is missing) versus having to tow it all the way home.

Thanks in advance.
Jeff M.
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Mercedes W123 DIY pages are now located here.
1983 / 1984 300D Sold
2000 CLK430 Cabriolet ~58k Sold
2005 Avalanche 4x4 ~66k
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  #2  
Old 11-27-2002, 06:38 PM
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I'd look for a damaged (pinched) fuel line. Wreck could have caused it to "pinch" off which would act just like a dirty fuel filter - not being able to rev.
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  #3  
Old 11-27-2002, 06:51 PM
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Can you rev it at the injection pump?

Brian
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  #4  
Old 11-27-2002, 07:10 PM
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I've wondered the same thing but I don't think this guy trully knows his way around underneath the hood, I suppose I can ask though. I'm buying this car from a distance, otherwise it'd probably be quite easy for me to inspect it and find. Here is his exact words...

Quote:
The transmission has always had a good solid shift and I was concerned at first because it was so firm when shifting into gear. (the whole car settled down into gear) I was told by both owners of other cars like this and mechanics that was a character trait of this car. It just jumps when you put it in gear. Now, after the accident that "jump" is considerably more pronounced and the accelerator does not move the linkage properly when the gas pedal is pushed. Basically the car will not go because the arm to the carberator does not move far enough to actuate the throttle. I have had it looked at by a backyard mechanic and he thinks the violent shock of the rear-end crash broke a motor mount and that explains the change in transmission jump and the lack of linkage movement in the throttle.
Re-reading this it almost seems as if he himself watched the linkage not move, by the way he worded it. Also he implies either the motor or tranny are under a bind now. It's kinda like stabbing in the dark without being able to see what is going on.... Thanks for the suggestions, keep them coming. :-)

Jeff M.
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Jeff M.
Mercedes W123 DIY pages are now located here.
1983 / 1984 300D Sold
2000 CLK430 Cabriolet ~58k Sold
2005 Avalanche 4x4 ~66k
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  #5  
Old 11-27-2002, 07:49 PM
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The closest the linkage will ever get to a carb is when you are parked in front of a partshouse. I would be REAL concerned about the person looking at it and offering advice. Probably something simple but not seeing the damage myself I could not really say.
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  #6  
Old 11-27-2002, 07:56 PM
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Quote:
Originally posted by engatwork
The closest the linkage will ever get to a carb is when you are parked in front of a partshouse
LOL
I was thinking the same thing while I was reading it. Oh well he was tryingm most people don't try to answer anyone's questions when their car is up for sale. They simply say, I don't know....

~jm
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Jeff M.
Mercedes W123 DIY pages are now located here.
1983 / 1984 300D Sold
2000 CLK430 Cabriolet ~58k Sold
2005 Avalanche 4x4 ~66k
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  #7  
Old 11-27-2002, 08:16 PM
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Well he just sent me an email saying this:

Quote:
You can fix that gas throttle linkage so easy it aint' even funny! It is Very Easy!
Note ehere the rod rotates, more than likely what happened to your's happened to my brother's car, there is a bolt that adjusts the throttle. That rod is connected to a plate which inturn rotates to push on another plate which gives it throttle, if that elongated area is allowing the rod to turn, you will not get any throttle, or very little, An easy adjust ment and tightening of that bolt and you have throttle again!

On the older cars, 1980 and older they used a different setup, and what happened with them is that the spring tube would wear out and then you have about half throttle, I fixed mine by drilling a hole and pushed in a Roll Pin and then I had direct linkage.
While it is nice to see he is already referring to it as my car I think I'll have to get the decoders working on that first paragraph. :-) The second one makes sense but what rod rotates? Sure they all have adjustable lengths but they shouldn't be rotating. I never paid attention but surely those are reverse threads. Anybody clue me in?

Thanks,
Jeff M.
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Jeff M.
Mercedes W123 DIY pages are now located here.
1983 / 1984 300D Sold
2000 CLK430 Cabriolet ~58k Sold
2005 Avalanche 4x4 ~66k
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  #8  
Old 11-27-2002, 08:30 PM
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Is this the mystery part he speaks of? Still, I find it hard to believe that this impact could jar this lose, but I guess anything is possible.

~jm
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Can't give throttle? Motor mounts??!-manual.jpg  
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Jeff M.
Mercedes W123 DIY pages are now located here.
1983 / 1984 300D Sold
2000 CLK430 Cabriolet ~58k Sold
2005 Avalanche 4x4 ~66k
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