Make sure your computer isn’t teetering between WOT and normal operation! Mass Airflow Meters (MAF) This will make sure the computer goes to open-loop ignoring the oxygen sensors. Make sure the voltage is smooth and not jumpy and that it’s idle+3v at WOT. Put your meter on the green and black wires and test your idle to make sure it’s within an acceptable range (0.6~1.115) and ramp that throttle to wide-open. That number is idle voltage + 2.71, or to be safe aim for idle voltage + 3v. The key is to ensure you have enough voltage to let the computer know you’re mashing through the floor boards. The computer will read the TPS voltage and remember, there is no “specific” number to strive for so there’s no need to go crazy trying to reach 0.999v at idle. To test voltage: The green to black wires should be anywhere from 0.6 to 1.15 is acceptable. This is a potentiometer for the EEC (computer) to send a reference voltage and monitors the output voltage to determine precise throttle position. This article is all about the different sensors on your fox Mustang – I hope this will help you with your tune-ups. The EFI system isn’t really that complex on a fox body Mustang, it has a few sensors, solenoids, relays and a computer handling all this input to strive for the best fuel ratio for most performance and mileage in all possible conditions.
