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  #1  
Old 12-29-2011, 03:36 PM
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What section of 124 FSM addresses ALDA adjustment?

What section of 124 FSM addresses ALDA adjustment?

Mercedes Benz Model 124 - OM602, OM603 Maintenance Manuals

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Old 12-29-2011, 04:48 PM
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At the risk of being corrected, it was always my understanding that officially Mercedes doesn't sanction any "tampering" with the ALDA as it's (a) delivered as a factory preset and (b) to alter its setting interferes with emissions setup. I think you would need to find Bosch injection service literature, not Mercedes, in order to read about it.
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2002 e320 4matic estate│1985 300d│1980 300td
Previous: 1979 & 1982 & 1983 300sd │ 1982 240d

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Old 12-29-2011, 05:16 PM
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Quote:
Originally Posted by Zacharias View Post
At the risk of being corrected, it was always my understanding that officially Mercedes doesn't sanction any "tampering" with the ALDA as it's (a) delivered as a factory preset and (b) to alter its setting interferes with emissions setup. I think you would need to find Bosch injection service literature, not Mercedes, in order to read about it.
Perhaps you're right....my question arises from a comment by babymog in What Factors Affect Relationship Between Accelerator Depression and Acceleration? post #14.

However, if MB never envisions an adjustment, why would there be a set screw? Only done as initial set-up?
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14 E250 Bluetec 4Matic "Sinclair", Palladium Silver on Black, 154k miles
06 E320 CDI "Rutherford", Black on Tan, 172k mi, Stage 1 tune, tuned TCU
91 300D "Otis", Smoke Silver on Tan, 142k mi, wastegate conversion, ALDA delete

19 Honda CR-V EX 63k mi
Fourteen other MB's owned and sold
1961 Very Tolerant Wife
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  #4  
Old 12-29-2011, 05:30 PM
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Quote:
Originally Posted by shertex View Post
Only done as initial set-up?
I think so.
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Old 12-29-2011, 05:54 PM
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Quote:
Originally Posted by shertex View Post
However, if MB never envisions an adjustment, why would there be a set screw? Only done as initial set-up?
Mercedes techs didn't do adjustments or repair work on injection pumps. Service or calibration would be done by a Bosch shop (pump taken off car and sent out).

This is based on my memory of comments made by Stu Ritter on one of the 'old' Mercedes lists, some years ago. Stu was a Mercedes dealer tech when these cars were current.

At the time Stu made such comments (or at least, on those lists) no one was messing with the ALDA to the extent we see today. Aside from turning the adjustment screw (at your peril) we were told they were not a user-servicable item.

Times have certainly changed....
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2002 e320 4matic estate│1985 300d│1980 300td
Previous: 1979 & 1982 & 1983 300sd │ 1982 240d

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Old 12-30-2011, 01:05 AM
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I sent a 603 IP to Gus at Pacific FI to be rebuilt. It came back with a sealing plug over the ALDA adjustment screw.

Sixto
87 300D

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