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shift weirdness
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CarGuru > Mercedes > shift weirdness 8 April 2005 07:00:32

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shift weirdness

Ron Tellus 7 April 2005 21:20:48
 Had some shifting difficulties with an '83 300D. Replaced the
plastic shift arms. Now, shifting is erratic - sometimes perfect -
sometimes rough. If I keep it floored, it's much, much smoother than if
if I go easy.

If I take it easy, shift points vary with the throttle position. In this
case. the tranny usually will only stay in second gear for a few seconds
before shifting into 3rd -- much too early. I realize this description
isn' much to go on.

Any thoughts??
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Ron Tellus 8 April 2005 00:02:02 permanent link ]
 On Thu, 07 Apr 2005 16:00:30 -0700, T.G. Lambach wrote:
I believe there are two issues to be investigated.>
The transmission's shifts are coordinated with the throttle position. > The older models have a "pressure" rod or cable from the (top rear of > the engine) throttle linkage down to the right side of the transmission. > At some point after '82, I believe, this was changed to a vacuum system. > Your car is up shifting prematurely because its transmission isn't > getting the correct throttle position message.>
The transmission's shifts are modulated by a vacuum powered modulator > whose vacuum supply is controlled by a throttle linked vacuum valve on > the injection pump. The principle is: the greater the vacuum the softer > the shift, conversely at full throttle there's no vacuum to the > modulator because M-B wants a fast, hard shift.


Excellent. Any ideas where I can buy or find a step by step
troubleshooting guide for this subsystem?




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T.G. Lambach 8 April 2005 03:00:30 permanent link ]
 I believe there are two issues to be investigated.

The transmission's shifts are coordinated with the throttle position.
The older models have a "pressure" rod or cable from the (top rear of
the engine) throttle linkage down to the right side of the transmission.
At some point after '82, I believe, this was changed to a vacuum system.
Your car is up shifting prematurely because its transmission isn't
getting the correct throttle position message.

The transmission's shifts are modulated by a vacuum powered modulator
whose vacuum supply is controlled by a throttle linked vacuum valve on
the injection pump. The principle is: the greater the vacuum the softer
the shift, conversely at full throttle there's no vacuum to the
modulator because M-B wants a fast, hard shift.
Add comment
Ernie Sparks 8 April 2005 07:00:32 permanent link ]
 Thanks for the good info. I've had the same problem on my wife's 300D. When
I drive it is simply hold the tranny in the gear I want until I reach the
shift rpm that feels good.


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CarGuru > Mercedes > shift weirdness 8 April 2005 07:00:32

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