Based on all the information so far, I am planning to do the following:

1. Verify that a 95 E320 ECM adapats upto 32%, to get 7% more adaptaion than the current software limit. Find someone with a 95 E320 and figure out how to copy the Chip.

2. Replace the Diaphram pressure regulator.

3. Find out about the Purge switchover valve.

4. Have the Mercedes Benz dealer check for Intake air leaks.

5. Find a used speedometer cable (e-bay) to clean the EGR valve pipe.


From the Shell website, I found that the gasoline storage life is only about 6 months. After that it can cause problems. My car was not driven much from 94 to 03 (58K miles).

ECM controls the Air/fuel mixture by adjusting the fuel injection duration. I think that the ECM is opening the fuel injectors, but the injectors are not getting sufficient fuel flow, causing the lean condition.

Any suggestions to the above course of action?

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Zafar
94 E320 58000 Miles