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#1
12-13-2012, 07:36 AM
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A Few OM616 ADA Questions
As I understand it, my 1983 240D has an ADA, not an ALDA, on top of the injection pump. I know a little about ALDAs, really nothing about ADAs, so I thought I might pose a few questions. (There are a few threads on topic, but not a lot.)
1. How does ADA function differ from ALDA function? 2. At the base of the ADA there is a fitting that looks like it should have a vacuum hose connected to it, but nothing is there. What should I make of this? 3. Is it advisable to attempt to adjust the ADA? 4. If so, can I turn the set screw with the ADA in place or do I need to remove it? Thanks.
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14 E250 Bluetec 4Matic "Sinclair", Palladium Silver on Black, 159k miles 06 E320 CDI "Rutherford", Black on Tan, 179k mi, Stage 1 tune, tuned TCU 91 300D "Otis", Smoke Silver on Tan, 145k mi, wastegate conversion, ALDA delete 19 Honda CR-V EX 77k mi Fourteen other MB's owned and sold 1961 Very Tolerant Wife 
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#2
12-13-2012, 07:52 AM
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It does the same thing as an ALDA, that line is open to the atmosphere to get its reading.
An ALDA gets its reading from the boost created by the turbo. In earlier models the adjustment was manual. I have no experience with an ADA. I sold my 240 many years ago.
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83 SD 84 CD
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#3
12-13-2012, 04:43 PM
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The ada is an altitude compensation device to modify the amount of fuel at different elevations. Do yourself and your engine a favour. Check the fuel pressure in the base of the injection pump. All 616 engines should have this done.
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