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Old 09-29-2000, 09:38 AM
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My 89 420SEL gas pedal seems to be a little hard to push. Is this a class problem? It's not that bad but I would think it would be alot easier when accelerating. Any thoughts?

89 420SEL
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Old 09-29-2000, 01:56 PM
Q Q is offline
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Join Date: Aug 2000
Posts: 839
The linkage for the throttle is quite complex. The manual calls for regular lubrications. Try shooting all of the joints with a little Tri-Flo lubricant. It doesn't have the solvents in it like WD-40 does.
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Old 09-29-2000, 02:24 PM
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I had this problem with both my 300 SEL and SD. On my SD, it was a $5 pin, but on my 300 SEL, I needed something called a fuel governor or something, I forget which., but it was about $220 to replace including labor.

After that the pedal worked fine. This also helped my gas mileage. I went from 18 to 21 on my 300 SEL after it was fixed.

'89 420 SEL
'90 300 SEL
'68 Olds 88 Convertible
'84 300 SD (sold it)
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Old 09-29-2000, 03:04 PM
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Unlubed linkage in my 82 300SD-T caused this, as well as a BENT linage piece connecting pedal to other linkage through firewall. How it bent I have no clue (other than to presume dry linkage forced a bend over time, exacerbated by continual increases in required pressure), but it was hanging up and making for a 150-lb pedal.
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Old 09-29-2000, 04:23 PM
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Had the same problem on my 240D... turned out to be bent linkage. This seems to be a common problem...

76 240D (W115) - 550K miles
78 300D (W123) - 200K+ miles
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