Hi its Bill here again, about the Ford '99 Longreach ute 4.0 ltr Where exactly is the cold start temp sensor? is it the two pronged plug in thing about 2" under the thermostat?..and how would that affect fuel consumpsion ? (just asking) The car is absolutely gutless in the morning 1st up ...then little power off the mark as well all the time.like at the traffic lights. PS I put another one in today,(CSTS), thats if it was the rite thing I replaced, but to be fair haven't had enough time to test economy as yet.

The cold start temp sensor is same as ambient air sensor, tells the computer to give the engine a certain amount of fuel to start since there isn't a choke per se. There are two temp sensors, the air temp sensor and the water temperature sending unit usually near the thermostat. The cold start doesn't affect fuel economy unless it's telling the computer the engine is cold. The computer reads several sensors to meter the fuel, map sensor which works off intake manifold pressure (check rubber hose for cracks that connects it), throttle position sensor which is the main fuel control (test it with an ohm meter) and oxygen sensors. The main culprits for bad fuel mileage are usually a partially stopped up catalytic convertor and bad oxygen sensor(s). You can sometimes remove a O2 sensor and spray it with carb cleaner , lightly brush the carbon off with a wire brush to get it working again. This fuel with alcohol is rough on all vehicles. Hope some of this helps.