hey i was lookin for some help , i have an 03 oz rally CEL throwin me a PO507, was told i need a new idle air control motor(600), and previously told before i needed a new front cat w. manifold(500), so im tired of these shops messin around i know theyre throwin me BS, any help/suggestions are appreciated! and i didnt wanna mess w. my throttle body myself, so i wouldnt throw off the throttle cable's calibration..let me know please asap i have inspection around the corner!

 

thats high idle, you can try to turn it down to get rid of the light.

 

OBD-II Trouble Code: Idle Air Control (IAC) System RPM Higher Than Expected.

WHAT DOES THIS MEAN?
In this case, the P0507 DTC (diagnostic trouble code) is triggered when the PCM (powertrain control module) detects an engine idle speed that is greater than the desired (pre-programmed) RPM.

TECHNICAL DESCRIPTION:
The amount of air taken in during idling is regulated by the opening and closing of the servo valve located in the air passage that bypasses the throttle body.
If there is a malfunction of the IAC system, the actual engine speed will not be identical to the target engine speed.
The ECM or PCM checks the difference between the actual engine speed and the target engine speed

POTENTIAL; SYMTOMS:
Most likely you'll notice the idle speed is higher than normal. There are potentially other symptoms as well. Of course, when trouble codes are set, the MIL (malfunction indicator lamp, a.k.a. the check engine light) illuminates.

A P0507 DTC trouble code may be caused by one or more of the following:

-A vacuum leak
-Leaking air intake after the throttle body
-EGR valve leaking vacuum
-A faulty positive crankcase ventilation (PCV) valve
-Damaged/failed/dirty throttle body
-Failed EVAP system
-Failed IAC (idle air controller) or faulty IAC circuit
-Idle air control motor failed.
-Open or shorted idle air control motor circuit, or loose connector.
-ECM failed.
-PCM failed.


POSSIBLE SOLUTIONS:
This DTC is more of an informational code, so if there are any other codes set, diagnose them first. If there are no other codes, inspect the intake air system for air or vacuum leaks and damage. If there are no symptoms other than the DTC itself, just clear the code and see whether it returns.

If you have an advanced scan tool that can interact with the car, command the idle higher and lower to see if the engine responds appropriately. Also check the PCV valve to see if it's blocked and needs to be replaced. Check the IAC (idle air controller) if equipped, verify it's operation. If available, try swapping in a new throttle body to see if that fixes the problem.

 

Great post. This is a lot of help for this code. I have the same problem. Thank you!!

 

can any shop alter that for me?

 

Any good mechanic should know how to. Finding a friend who is a mechanic is a lot of help.

 

you can alter that yourself there is an idle screw on the top of the TB


but that wont fix your problem im also throwing that code and if messed with that as well as the idle speed control sensor, so its not either of those in my case and if its throwing a code adjusting your idle isnt gonna fix anything.

also im bumping this so see what anyone figured out cause i cant figure it out and ive ruled out vacuum leak past the maf