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Old 03-08-2001, 11:56 PM
Richard Wooldridge Richard Wooldridge is offline
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Join Date: Dec 2000
Location: Battle Ground, WA
Posts: 576
Temp. sensor...

I agree with Stevebfl that this is a poor fix. Your temperature sensor may have become defective, however, and could be causing your original problem. I had a similar problem on a GM vehicle - the resistance of the sensor was supposed to be around 7500 ohms at 40 degrees, but when I checked it it was only around 2000 ohms at 40 degrees, which made the engine run way too lean on a cold startup. Replacing the sensor took care of the problem. The hot resistance of the temperature sensor is very important, as Stevebfl mentioned, as the temperature sensor is one of the primary fuel control inputs to the computer. I don't have a chart for the M-B sensor, but on a GM sensor the resistance at 210 degrees should only be 185 ohms. Adding 470 ohms to the 185 ohms would make the engine run as if the choke were stuck on all the time, a bad scenario for you and the engine both. This could affect your fuel mileage by as much as 30 percent. Sensors are easy to test, all it takes is a pan of water, a thermometer, a burner and some ice cubes and an accurate ohmmeter. If you don't want to bother testing it, my suggestion would be that you purchase a new sensor and install it.
Richard Wooldridge
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