'04 F150 idle issue

[projectPONY]

has the 4.2L V6 in it. erratic idle with a/c on and stalls at a stop ONLY with the a/c on. just got back from AutoZone, they pulled the codes for me. only one that came up is a P0506. can anyone decipher that for me? the kid behind the counter barely knew his own name much less work the computer in front of him.

TIA

[psdtech]

try cleaning the throttle body or iac

P0506 - Idle Air Control System RPM Lower Than Expected
Vehicles with electronic throttle control (ETC) This DTC is set when the powertrain control module (PCM) detects an engine idle speed that is less than the desired RPM. Air intake restriction
Exhaust restriction
Engine mechanical fault.
Sludged throttle body
Damaged electronic throttle body (ETB)
Damaged PCM
This DTC may be accompanied by other DTCs. Diagnose other DTCs first. If other DTCs are not present inspect the intake air system for air restrictions and damage. If no concerns are present, clear the DTC and retest

P0506 - Idle Air Control System RPM Lower Than Expected
All others This DTC is set when the PCM detects an engine idle speed that is less than the desired RPM. IAC circuit open
Air inlet is plugged
Damaged or incorrect IAC valve
IAC valve stuck closed
VPWR to IAC solenoid open
IAC circuit shorted to PWR
Damaged PCM
Disconnect the IAC valve and look for no change in engine RPM as an indication of a stuck or damaged valve.

[projectPONY]

well, now there is question whether it has an IAC or not. one parts store said yes and another said no. I'm not familiar with this truck at all so I wouldn't even know what it looks like.

[psdtech]

4.2 should have an iac. It right on top of the throttle body

[projectPONY]

haven't had time to mess with it. I'll try to get out there tomorrow.

[projectPONY]

ok fellas, finally got around to making time for it. I removed TB and gave it a thorough cleaning. will taking the negative cable off the batt. clear the code and turn off the CEL?

[projectPONY]

oh, and if I'm not mistaking, this is the IAC motor. someone please correct me if I'm wrong.

[projectPONY]

sh$#@t, sorry about the size.

[john98gt]

No that is the drive by wire

[greenbullitt]

put a throttle body on it

[projectPONY]

No that is the drive by wire

ok, so it DOESN'T have an IAC.



I pulled it off earlier and I just got back from a 45min drive. not CEL and no stalling. hmm, maybe all it needed was a good cleaning.

[Andy@PrimeTuning]

Yep all it needed was a good cleaning - I've seen that a time or two