Having problems with your 2004 Chrysler Pacifica ?

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 th

Posted / edited by AnonymousUser on : 18-03-2019

Answers :

\015\012The 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.
\015\0121. 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.
\015\0122. 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.
\015\0123. 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.
\015\012set the idle down on the carb and check out.
\015\012check your timing and motor mounts and make sure all cylinders are igniting when needed these will most likly be the answer to your problems
\015\012thanks.keep updated.please do rate the solution.thank you for using fixya.
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.
\015\012To 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.
Repair Help & Product Troubleshooting for 2004 Chrysler Pacifica

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