Quote:
Originally Posted by MANIATIKO
Hello guys .I figured out the issue .
Since I have a w116 will the same engine I tested sensors . And found the Air temperature sensor in the air filter housing is bad. Now I have scoured for a replacement and it has been no available. Is someone know of a good one used or new for sale please let me know. Thanks in advance
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Good that you found that. Rich running can be caused by many things. Air leak may be one, but so can anything that affects the mixture.
- Air leak can be AAV not fully closing
- As Meltedpanda suggested, worn trigger point rubbing blocks once car has done about 100k miles can cause rich mixture.
- Both the air and coolant temperature sensors provide input to the ECU for mixture control. Easy to test (as you have done)
- Incorrect fuel pressure (should be in the 29-30.5 psig range
- Signs that someone has tampered with the MPS.
As Frank said, the ECU knob only fine tunes mixture at idle (throttle fully closed)
Those air temperature sensors are used on many cars. The part numbers are Mercedes A0015428817 and Bosch 0280130006.
I did a search and found several for sale at a very wide range of prices! Search for the Bosch number.
https://www.oreillyauto.com/detail/c/bosch/fuel---emissions/fuel-injection/efi-temperature-sensor/b9537ee001bf/bosch-multi-purpose-sensor/bos0/0280130006
The engine in your car is similar to the one in my 72 SL. You might find tonk.ca useful - choose the 450SL. Your Djet (EFI) engine is covered.
This link is also informative:
https://www.tonk.ca/misc/djet-efi-manual.pdf