Quote:
Originally Posted by chasinthesun
I agree with vstech on the linkage ,the one easy way to check this is to see if the rod has play in it ,look at the linkage from the rod that assemblys from the main linkage to the firewall ,here youll find a hardened rubber pivot behind a plate that makes connection from their to the excellorator pedal,it rotts out over time giving the feeling of slow or low excelloration.I bought a car once with this issue and the people were explaining the same symptoms as yours except 35 mph.The bonjo bolt is another easy fix if thats not it ,it easy to get to ,located at the top left rear of the motor and connects at the rear of the intake ,youll need an open 13mm wrench and then clean the inner pieces of the bolt then replace ,the piece has a hose to the trannie,it always gets carboned up every 30k or less.A MB 617 COMMON upkeep and service advized listed item.
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+1 and additionally:
Follow the same rod from the firewall bushing forward and look for the 10mm nut/fastener. Make sure this is tightened when the linkage is positioned to accelerate. I mentioned this because the slot where this item goes in is elongated and allows for a particular range.
If this fastener is not tightened properly, it would feel as if the car is underpowered because the linkage is not adjusted properly. Not enough of the linkage is pushing the throttle arm on the injector pump (due to elongated slot) so it doesn't receive fuel input.