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  #1  
Old 03-27-2002, 05:59 PM
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Question 126 - harsh shifts

My '87 300 SDL is experiencing rough shifts. The shifting is not so bad when accelerating hard, but light to mid acceleration is what causes the harsher shifting. I realize "feeling" the shift points in these cars is largely considered a feature. I do not mean harsh like good, this seems somewhat like a clunk. Additionally, the shifts appear to be more harsh when the AC is on.

Thanks.
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Chris

'04 ML500 - 53k, Inspiration Edition, Desert Silver
'11 Audi A4 Avant - Brilliant Black
'87 300SDL sold
'99 C280 Sport sold
'85 190E 2.3 sold
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  #2  
Old 03-27-2002, 09:44 PM
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You have what sounds like a classic vacuum leak. Make sure that the modulator vacuum pipe is clean and free from any holes. Be sure also that the modulator cap has no holes in it.
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Old 03-28-2002, 05:45 PM
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Benzmac

Would you be kind enough to explain the location of your suggested culprits? Thanks.
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Chris

'04 ML500 - 53k, Inspiration Edition, Desert Silver
'11 Audi A4 Avant - Brilliant Black
'87 300SDL sold
'99 C280 Sport sold
'85 190E 2.3 sold
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  #4  
Old 03-28-2002, 06:53 PM
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The modulator is on the left side of the transmission ahead of where the linkage from the shift lever attaches to the transmission. There will be a vacuum tube coming off the modulator and running up towards the engine compartment.

Sixto
91 300SE
86 300SDL (due soon)
81 300SD (for sale cheap)
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Old 03-28-2002, 07:07 PM
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Sixto - On the left side when facing the front of the vehicle, I assume.
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Chris

'04 ML500 - 53k, Inspiration Edition, Desert Silver
'11 Audi A4 Avant - Brilliant Black
'87 300SDL sold
'99 C280 Sport sold
'85 190E 2.3 sold
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  #6  
Old 03-28-2002, 07:16 PM
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smoke gets in your eyes
 
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the other left

Chris,

Sorry about that. No. It's on the left of the transmission as viewed from the driver's seat.

Sixto
91 300SE
86 300SDL (due soon)
81 300SD (for sale cheap)
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  #7  
Old 03-28-2002, 07:40 PM
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another stupid clarification...

Is it necessary to get under the vehicle to reach this modulator, or can it be diagnosed through the engine bay?
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Chris

'04 ML500 - 53k, Inspiration Edition, Desert Silver
'11 Audi A4 Avant - Brilliant Black
'87 300SDL sold
'99 C280 Sport sold
'85 190E 2.3 sold
Reply With Quote
  #8  
Old 03-28-2002, 08:07 PM
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smoke gets in your eyes
 
Join Date: Jun 2000
Location: SF Bay Area
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You have to go under the car. Get a good set of ramps and make easy work of it.

Sixto
91 300SE
86 300SDL (due soon)
81 300SD (for sale cheap)
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