Join Date: Jun 2011
Vehicle: 05 E320cdi
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Have you checked other stuff? Chain stretch may be an issue with 500k miles. Have the injectors ever been replaced? They don't last forever. Air filter?
You might need to adjust alda but I believe thay made it harder than on the earlier models.
I changed out all injectors onmy SDL two years ago at around 360k miles. Result has been a quieter engine, smoother engine and while I did not have a huge smoke plume exhaust, that too was reduced.
I have owned at least one MB diesel for the past 23 years, and adjusting the ALDA had never been an issue. Just have never needed or thought to do it.
What I have found is that these engines do much better when driven "like you stole it" at least on a regular basis. Puttering around town can lead to your condition.
Mobil 1 synthetic is also very theraputic. I change about every 8 to 10k miles
Have you used Lube Moly Diesel Purge? It could be a step before you elect to change out the injectors. Does an outstanding job.
One other thing to have checked is your turbo waste gate function. As these age, they can weaken, which effectively reduces the boost provided to the intake.
Sorry to ramble, but, I am just reticent to mess with the ALDA
1987 300SDL 404k
1993 300D 306k
This one connector is colored differently that the "off orange / yellow" of the others. On the five cyl OM0602 it seems to be located between the intake orifice and the alda coonection.
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