Fuel Pedal is tough to push

  • Thread starter Thread starter jsegura525
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J

jsegura525

Hello again my information friends,

I have a 89 240DL (5 speed) in prestine condition, it was
well kept and always garaged, this cars gas
pedal is very easy to press and a pleasure to
drive.
I also have a 91 240 (automatic) which is my fixer upper,
I just fixed the odometer with information from
this site (thanks folks), this car's gas pedal is
harder to push.
Any advice on how to make the pedal softer to push.

Thank in advance,
Joseph Segura
 
In an earlier contribution to this discussion,
Hello again my information friends,

I have a 89 240DL (5 speed) in prestine condition, it was
well kept and always garaged, this cars gas
pedal is very easy to press and a pleasure to
drive.
I also have a 91 240 (automatic) which is my fixer upper,
I just fixed the odometer with information from
this site (thanks folks), this car's gas pedal is
harder to push.
Any advice on how to make the pedal softer to push.

Thank in advance,
Joseph Segura

Buy some heavier boots! <g>

Seriously though, depending on the auto transmission design, the throttle
pedal may have an additional cable which controls when the tranny changes
gear, depending on how hard you're trying. If so, make sure that this cable
moves freely. If it is sticky, it could affect the feel of the throttle
pedal.
--
Cheers,
Roger
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Hello again my information friends,

I have a 89 240DL (5 speed) in prestine condition, it was
well kept and always garaged, this cars gas
pedal is very easy to press and a pleasure to
drive.
I also have a 91 240 (automatic) which is my fixer upper,
I just fixed the odometer with information from
this site (thanks folks), this car's gas pedal is
harder to push.
Any advice on how to make the pedal softer to push.

Thank in advance,
Joseph Segura

For what its worth, I had a rather hairy experience in a 760 GLE TD. Had
bought it the month before. Was coming over an overpass of a local freeway
with traffic front and back, and both sides. The hill had a sharp
incline... too match traffic I pushed the accelerator farther than usual...
and it stuck down, with slack, meaning I couldn't pull it back with the
foot. So with a combination of brakes and ignition key I kept the vehicle
roughly in pace with the traffic... most people would have had an accident
at this point I think, as the traffic was around 40mph, with tight spacing
between cars.

Anyway... got it to safe point and pulled over. Tracing the engine side, I
found the throttle plate that the accelerator cable was controlling. It was
spring loaded, which provided the movement back through the firewall. It
had caught on a recently done replacement of all hoses (before I bought it).
One had to depress the accelerator beyond a certain point for the plate to
catch on water hose which was routed over the plate. A zip tie fixed it.

Point is, do a bit of checking as to what might be binding. Could be the
cable itself, could be what the cable operates. You may be able to tell with
some quick checks... in your driveway. If its the cable binding, either due
to lack of lube, or whatever, you may have to replace it if you can't force
lube into it. If there is a kink in the cable (probably not), you'd also
have to replace it. But there is a good chance you can figure out the
problem. Could also be the spring return is caught or too stiff.
 
old cables can cut a groove in the plastic liner. Check and if
necessary replace
 
I've had two scary experiences related to this with two different
causes:

1983 240 Turbo: The pedal is connected to the throttle body by a cable
that runs through an threaded plastic assembly (a short plastic tube
~2.5cm long, threaded so you can turn it to adjust) mounted on the
throttle body bracket. From age and use this plastic tube broke and
the cable stopped passing straight through and the resulting kink in
the cable was too much for the spring in the throttle body to
overcome. Result: pedal hard to push and slow return to idle speed.

1989 760GLE: While driving I had cause to step on the gas pedal and
push it all the way to the floor. This was outside the normal range of
use and caused the throttle body to turn out of the well-worn range
and get stuck in a "wide open" position. Once I got the
speeding-out-of-control vehicle to the side of the road and got under
the hood, I was able to put my hand on the throttle body and give it a
bit of a turn at which point it snapped closed. A soaking in WD-40
freed it up at the top end of its range. Very scary.

Based on this I'd say start at the throttle body and make sure it's
free and smooth in its operation and then work your way back.

Good luck,
blurp
 
M-gineering said:
old cables can cut a groove in the plastic liner. Check and if
necessary replace


And sometimes they pop off the pully and that makes them stiff.

Also the automatic pedal may be a bit harder to push since it also
drives the kickdown linkage for the transmission, it shouldn't be a lot
harder though.
 
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