I am having a problem getting rid of a P0507 (Idle RPM Higher Than Expected) code on my sons 2000 Lumina 3.1L sedan. I have replaced the following: Spark Plugs, Spark Plug Wires, Fuel Filter (The flare fitting was so corroded that I had to cut the line and splice in a repair section, it was the original Fuel Filter), Idle Air Control valve The History: Just bought this car for my son USED. It idled rough and was down on power. Had a bunch of codes stored I just cleared them all out (Maybe should have written them down first?!?!), anyway, the only 2 that came back on were (I think P0303 (#3 cylinder misfire) the coil & plug boot were rusty)(someone had replaced the front 3 plugs and wires but not the back 3), put on all new wires, gapped and installed all new plugs, cleaned the coil contact surface and coated with dielectric grease, (PROBLEM SOLVED, No more P0303 Code). Had IACV (Idle Air Control Valve) error code (can?t remember the code #) (IACV and Throttle Body had Carbon deposits), removed and cleaned the Throttle Body (old IACV measured 1 1/8? same as new one), Replaced IACV, Reinstalled Throttle Body/IACV. On the first test run I started getting the dreaded P0507 DTC code. The engine was still seemed down on power after the IACV, Plugs and Plug Wires, replacing the Fuel filter solved this problem. I have checked all visible vacuum hoses for cracks and to make sure they are properly connected (looks OK). Sprayed carburetor cleaner around all the upper and lower intake manifold mating surfaces looking for a vacuum leak (no RPM change, OK) Disconnected positive battery cable for about 1hr trying to force computer to relearn sensor settings, (No Help there) I am really at a loss here. The engine does not seem to be idling high to me, looks like about 700-800 in park on the dash tachometer. I am leaning towards replacing all the upper intake valve cover Etc gaskets on the top of the motor, but, I just hate to throw parts, labor and $$$s at a problem if I can?t pinpoint it. ANY Help APPRECIATED THANKS :-) In Advance Stu Thomas

check for a vacuum leak...

P2173 DODGE - High Air Flow - Vacuum Leak Detected - Slow Accumulation
https://www.autocodes.com/p2173_dodge.html

P0507 - Idle Control System RPM Higher Than Expected
https://www.autocodes.com/p0507.html

possible causes are:

Dirty throttle body
Electric throttle control actuator incorrectly adjusted/faulty/damaged
Air leak on Intake
Poor electrical connection to the Intake Air Control valve

P0507 KIA Idle Air Control IAC System RPM Higher Than Expected

code P0507 is:: idle control system RPM higher than expected

Check this link out and the causes of your P0507 code. P0507 OBD II Trouble Code Idle Control System RPM Higher Than Expected...

P0507 - Idle Air Control (IAC) System RPM Higher Than Expected

This P0507 code is one that's sometimes triggered on vehicles that have electronic throttle control. That is, they don't have a regular throttle cable from the accelerator pedal to the engine. They rely on sensors and electronics to control the throttle. 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. In the case of GM vehicles (and possibly others) if the idle speed is over 200 rpm higher than expected, this code will be set.

Potential Symptoms: 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.

Causes: 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

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. On Nissan Altimas and possibly other vehicles the problem may be fixed by having the dealer perform an idle air relearn procedure, or other relearn procedures.


Hope this helps; keep us updated.

possible causes
- Dirty throttle body
- Electric throttle control actuator misadjusted or damaged
- Faulty Electric throttle control actuator
- Intake air leak
- Poor electrical connection to the Intake Air Control (IAC) valve
solution !!!
If there are no intake leaks, clean throttle body, adjust engine idle and erase engine code. If the code comes back you may have to replaced the Electric Throttle Control Actuator (Motor) to repair the problem.

P0507 - Idle Air Control (IAC) System RPM Higher Than Expected

This P0507 code is one that's sometimes triggered on vehicles that have electronic throttle control. That is, they don't have a regular throttle cable from the accelerator pedal to the engine. They rely on sensors and electronics to control the throttle. 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. In the case of GM vehicles (and possibly others) if the idle speed is over 200 rpm higher than expected, this code will be set.

Potential Symptoms: 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.

Causes: 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

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. On Nissan Altimas and possibly other vehicles the problem may be fixed by having the dealer perform an idle air relearn procedure, or other relearn procedures.

Hope helps (remember comment and rated this).

idle controll system idle to high is the code description