Hello,

I went ahead and purchased a used EHA from eBay ($59 with shipping).

Thank You for clearing that up. I need to change my thinking in that I should consider the system as two parts. 1. IDLE 2. AT SPEED (Throttle actuating.)



I looked for the coolant temp sensor. I think it is supposed to be right near cylinder 6 and is the last one in the line of sensors. People who posted previously kept mentioning about a 4 prong sensor but my sensor only has 2 prongs with two individual connectors coming from the wiring harness.

I searched the forum for the expected ohm values for a good sensor, but I was unable to find any posts or threads. (I know they exist, but my search terms are not finding the threads.)

Does anyone know how I should test the water temp sensor and what ohm values I need to be getting?

I do not have an air intake temperature sensor fitting to this car.

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2006 BMW M5 "Heidi" @ 109,000 miles
2005 MBZ C55 AMG "Lorelai" @ 165,000 miles
1991 MBZ 300E "Benzachino II" @ 165,000 miles
1990 MBZ 500SL "Shoshanna" @ 118,000 miles

(On the hunt for a good used M103 engine as of 6/10/23, PM me if you have one to sell!)