Question about 2004 Chrysler Pacifica

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I am having a problem getting rid of a P0507 (Idle Control System 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 parst, 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

    You need to clean the idle speed control (There is no Idle Speed control as far as I know)(Idle Air Control, Throttle Position Sensor maybe???)
    and if that does not solve
    then the next thing is to replace the coil pack and check spark(I
    suppose it's a petrol engine) plug,as if the engine is under-revs ("Under-Revs"??? The code is P0507 "Idle Control System RPM "Higher" Than Expected)
    then
    it means either combustion chamber is not functioning,(I have checked the spark on both terminals of all 3 coil packs with the new plug wires and they TEST OK)(compression tested all 6 cylinders, TESTED OK)
    which in turn
    could mean an o2 sensor, a catalytic converter or the coil that sists
    on top. (Catalytic Converter TESTED OK)
    You need to rewire the vehicle ("rewire the vehicle", isn't this a bit extreme and expensive to rewire the vehicle) and clear the codes before you
    look for any problem.This helps to reset the ECU and also disconnecting
    a battery for one hour is not sufficient to get it to reset,normally
    left for 24 hours..Diagnose the car first and reset error codes.

    To test for a faulty catalytic, observe the engine gets rough when warm
    up or exhaust very hot to the feel of your palm.Hope this helps.
    It will take me a couple days, but, i will make the time to let it sit for 24hrs with the battery disconnected and see what happens.
    THANKS :-)
    Stu Thomas


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The question is too vague to give a specific answer, however; a high idle can only be caused by one basic problem: too much air is getting into the intake manifold. Now, this can only be caused by one of (or any combination of) three things.
1. Throttle. If the throttle cable is too tight (likely) then it will always have the throttle open somewhat. Or, if the throttle is get stuck (not very likely at all) it will be open as well.
2. Vacuum leak. If any gaskets related to the intake manifold (IACV gasket, throttle body gasket, etc.) lose seal, or if any hoses or tubes (brake booster line, fuel rail ventilation, etc.) are disconnected or damaged, then too much air will get into the engine. This is easy to find, as there is usually a loud hissing coming from the source of the problem.
3. IACV malfunction (most likely). The idle air control valve is a solenoid operated plunger that regulates air into the engine when the throttle is closed in order to keep the engine running. If you have a check engine light, pull the code to be sure it's for the IACV. If it is then here are the two possible problems. One thing that is extremely common (especially on high milage cars) is that carbon will build up and cause the valve to stick. In this case it is worth while to clean it with a degreaser and then reinstall it and see if the problem improves. If this doesn't work then it's probably a malfunctioning IACV and you'll likely have to replace it (don't forget a new gasket!). I think this part ranges between $100-200.
--------------------------
set the idle down on the carb and check out.
------------------
check your timing and motor mounts and make sure all cylinders are igniting when needed these will most likly be the answer to your problems
---------------------
thanks.keep updated.please do rate the solution.thank you for using fixya.

Posted on Jul 16, 2009

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You need to clean the idle speed control and if that does not solve then the next thing is to replace the coil pack and check spark(I suppose it's a petrol engine) plug,as if the engine is under-revs then it means either combustion chamber is not functioning,which in turn could mean an o2 sensor, a catalytic converter or the coil that sists on top.You need to rewire the vehicle and clear the codes before you look for any problem.This helps to reset the ECU and also disconnecting a battery for one hour is not sufficient to get it to reset,normally left for 24 hours..Diagnose the car first and reset error codes.
To test for a faulty catalytic, observe the engine gets rough when warm up or exhaust very hot to the feel of your palm.Hope this helps.

Posted on Jul 15, 2009

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P507 buick regal 1998


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.


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05 FOCUS P0-507 CODE


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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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