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#1
03-27-2002, 04:59 PM
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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
03-27-2002, 08:44 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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Benzmac: Donnie Drummonds ASE CERTIFIED MASTER AUTO TECHNICIAN MERCEDES SPECIALIST 11 YRS
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#3
03-28-2002, 04:45 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
03-28-2002, 05:53 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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#5
03-28-2002, 06:07 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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#7
03-28-2002, 06:40 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
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