Hi. I recently introduced myself and 'Sadie' to the forum.
She was designated a gross-polluter by the state of California due to CO and HC. She had a rough seesaw idle. We had a smoke-down and found some big vacuum leaks introducing a lot of false air, and culminating a lean misfire.
- Vac line to transmission modulator which was split
- both breather hoses to injector caps
~ Idle sorted for now
O2 sensor was set full rich, didn't respond or read. O2 sensor was rusted in. Had it cut out by a local exhaust guy and re-bung'd. Didn't see the anticipated mixture improvement.
Popped out the ECU, and EC-eeEw..
Was hoping someone had a recommended cleaning procedure, or tell me to not bother and get another. I took a peek inside and looks like it could be worse. I dont see corrosion beyond the pins. The harness worries me a bit. After careful study, I will disassemble the ECU sandwich unless someone smarter than me stops me.
Lastly, I saw and was inspired by the epic write-up:
Inside the Engine Control Module, aka ECM or ECU. This relates specifically to the ECU for the 1980 450SL, however, I suspect it is very similar (if not identical) to 380SLs (1981 thru 1985), as the wiring diagrams indicate the same pinouts and connections. The 560SL however uses a very...
(mad props 🤘) , but didn't find a pinout for the KE-Jet (004 545 40 32) here. I found the attached elsewhere. Any advice and/or pinout confirmation would be appreciated.
*edit - fixed pinout attachment to non-transparent bg
*edit - confirmed - not correct pin allocation below