According to the Bentley all 528e before March 87 had three switches or sensors. The thermo-time switch which controls the cold-start valve, the coolant temperature sensor, and the coolant temperature switch. The coolant temperature switch is only on the 528e, while the 533 and 535 have the other two. The coolant temperature switch has two single push on connectors, while the other two have the spring clip type connectors. According to the Bentley, the temperature switch and sensor control the idle via the Motronic control unit. But, I believe it was one of these switches which caused my 528 to run rich resulting in black, dry fouled plugs the opposite effect that you say your getting. Best bet would probably be the switch. You can check both out with ohm meter but you'll have to pull them off and heat them in water or something to check the resistance. Make sure you're getting good connection to each, because you'll get a lot of dirt around there. Hello I have an 86 528e and there is a group of sensors right in front connected to the coolent system. Its right in under the end of the fuel rod that the six injectors are connected to, there is a yellow sensor right there its kinda down further then the rest of the other three sensors. Does anyone know what that is called. It tells my engine how much fuel is needed depending on how cold the coolent is and how much resistance it gives. I hope someone can help me. I think it might be causing my engine to run lean in the morning because that sensor is telling my engine to give me less gas then i need. Thank you Steve
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