Question about Chevrolet Lumina

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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

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  • sthomas128 Jul 16, 2009

    What do you mean"calibrate" it? I've never heard of this before and have replaced several IACVs with no problems. Is this one different somehow?
    The IACV instructions only said to make sure the extended length was 1 1/8" or less.
    It measured 1 1/8", "exactly" the same as the original one.
    You say "50 miles to relearn". should I just drive it and see what happens


  • sthomas128 Jul 16, 2009

    What is the Snap-On tool you were talking about, scanner reader?
    Do you happen to know the model # and/or name of that Snap-On scanner or what ever it is?
    Any idea how much $$$ that bad-boy costs?
    I do all my own work, so, I'm definitely going to consider the investment.
    THANKS :-)


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If you have the codes already I am not sure if you need this device. It sounds like it could be your throttle position sensor from what you've described. I would definitely suspect that before gaskets and such. If anything a smart investment with any car you plan on having and maintaining yourself is a factory service manual.You can get them from ebay for about 35$ here is an example. http://cgi.ebay.com/ebaymotors/2000-Chevy-Lumina-OEM-Shop-Service-Manual-Set_W0QQcmdZViewItemQQ_trkparmsZ65Q3a12Q7c66Q3a2Q7c39Q3a1Q7c72Q3a1205Q7c293Q3a1Q7c294Q3a50QQ_trksidZp3286Q2ec0Q2em14QQhashZitem334af87810QQitemZ220301129744QQptZMotorsQ5fManualsQ5fLiterature
This isn't much more then a haynes manual and has every nut and bolt and everything else and is what the dealer mechanics use. Then you could test the throttle position sensor with multimeter and know if its good or not. As well as a lot of other things. Let me know if you need further assistance before going onto another expert and I will be glad to assist you further.
Thanks,
Lee

Posted on Jul 17, 2009

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You need to calibrate the iac motor with a scan tool,like the snap-on scanner or the official gm one. Also,after disconnecting the battery it can take up to 50 miles of driving for the pcm to re-learn the idle.

Posted on Jul 15, 2009

  • Pete MacSparran
    Pete MacSparran Jul 16, 2009

    Yep,pretty much & GM ,Chrysler,Ford products made after 1993 all need a calibration process for the iac. Each company has a different procedure to do this & all have the re-learn process of driving for x miles to finish it. You can try just driving but you'll find that calibration using the proper equipment is neccesary.

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What does error code P2173 or p0507 mean on 2008 Dodge caliber 2.0L engine


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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
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* 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.

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1 Answer

05 FOCUS P0-507 CODE


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).

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