- I think it goes thus, although yours may be different- there are quite a few variations depending on the engine size and year, motronic or L-jetronic injection controls.
#1. separate leads to sensor, typically brown, brown with white stripe etc. This does the temperature gauge on the dash, and does not alter the fuelling as far as I know. Readings should be a few thousand ohms to a few hundred ohms depending on temperature.
#2. blue bodied bosch injection system connector; this one adjusts the fuelling with variations in engine temperature; should read 2100-2900 ohms when cold, 270 to 400 ohms when fully hot.
#3. brown-bodied bosch system connector. This is the cold start 'thermotime' sensor, and should have a temperature stamped on the side, 35 to 40-odd deg C depending on model. This should be fed volts on the black/yellow wire for a few seconds after the starter engages. It should have continuity below the stated temperature, and go open circuit above it.
#4 on back of cam cover... don't know about this one..are you sure this is a temperature sensor?
Needless to say, if #3 goes belly up your car won't start well from cold, and this is the most likely cause of your trouble.
On some models, there is a cold start injector that can stop working, even if the sensor #3 that controls it is working fine. This will also foul up cold starting.
I hope this helps.
Good luck.
Temp. Sensor info required!
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