Little confused on the IAC

[deadlast]

other than the one located in the intake tube, is there one located on the manifold somewhere? Also how sensitive is the sensor, and what are the results of one being faulty?

 

[Mike97gt]

the sensor on the intake tube is the IAT ( intake air temp) there is a IAC ( idle air control) motor on the intake. The IAC motor allows the PCM to control the idle speed and to keep enough air coming into the intake to keep the car running at closed throttle.

The IAT ( sensor on the intake tube) provides input on intake air temp to the PCM. the PCM uses that info to reduce timing when the air temp is hot.

 

[HISSIN50]

And if you indeed meant IAT, foxes dont have it in the inlet tube (like your 5N95 does), so that could be a source of confusion if reading old threads in 5.0 Tech.

 

[ddonaca351]

And if you indeed meant IAT, foxes dont have it in the inlet tube (like your 5N95 does), so that could be a source of confusion if reading old threads in 5.0 Tech.

Yes its on the intake manifold down on the runners, front one on the drivers side if I recall right...

The IAC is an all open or all closed solenoid. The computer uses a "duty cycle" to pulse it at the right speed to allow air around the throtle blade. (its mounted on the front of the throtle body on a fox) Little cylinder shaped gizmo about 1" round and about 3" long with a two wire plug going into it.

On high milage cars its a good idea to take the IAC off the throtlebody. Remove the two philips head screws that hold the electric solenoid part to the mechanical part of the valve. Remove the electrical solenoid, and then clean the mechanical part with carb cleaner (it will be covered in black soot and carbon). Then reinstall it all, and your idle should be more stable. (the computer will have to re-learn for a day or two, to get used to the newly freed up airflow)

DD

 

[deadlast]

oh oops, i meant the IAT, see im confused lol.