One looks like a knock sensor, i guess ones for temp, but what's the third one?
Car's been getting 10mpg in town. The sensor By the air filter plenum ( radiator sensor ) was disconnected and jumpered ( not any more, it's plugged in as it should be ). Which temp sensor goes to the computer ( is it called a DME? or ECU? on V's ; my car's a BMW and I know my way around them) ok ) I can't see any wires to the O2 sensor but that wouldn't cause such a poor fuel milage would it? If I race the motor I get black smoke but it smells like oil not fuel I'm just beginning on this car, since I've found many get 20 odd mpg in town. Any comments received with thanks.