Toyota EFI Mixture Adjustment
 

1:Locate the water temperature sensor

2:With the engine off, disconnect the plug and unwrap the plastic tape at the rear of the boot. Pull the boot forward to expose the two wires under the boot. There should be a brown wire and a green wire (sometimes green with a white stripe). You want to tap into the green wire. You may do it here or by the computer. It is preferable to tap into the wire by the computer. You can trace the wire using an ohmmeter only if you disconnect the multi-plug containing the wire at the computer. See your shop manual for the location of the computer in your car.

3:Locate and cut the green (or green and white) wire and splice a 0-5,000 ohm, variable resistor (also called a potentiometer)

4:the resistor there will be three prongs coming out of the resistor body. You will want to use the center prong and one of the side ones.

5:Determine the optimum position by adjusting the resistor until rpm increases slightly. If the engine chokes, sputters and smokes or if the "check engine" light comes on, it's too rich. Back off a little. A rich/lean gauge can be used to set the optimum point.

I did this to my toyota Camry last night it works well. ;D

Re:Toyota EFI Mixture Adjustment
 

Wow! what a cool mod!

Damn I wish hondas were that easy!

-Henry

Re:Toyota EFI Mixture Adjustment
 

they are, I bet you could do the same to the intake air temp sensor (IAT). just tell the car the air coming in is cooler than it really is and boom, you got more gas. ;)