Location of idle air control valve on mercury mountaineer 2003

THE IDLE IS CONTROLED BY THE ECM, THE IDLE AIR CONTROL VALVE WILL INCREASE IDLE WHEN UNDER A LOAD, SUCH AS STEERING HARD DIRECTIONAL OR WHEN THE A/C IS TURNED ACTIVATED. THE ECM IS ONLY PROGRAMABLE WITH A TNER LIKE DIABLOSPORT OR OEM, NO OTHER WAY THAT I AM AWARE OF.

REPLACE IDLE AIR CONTROL VALVE

The stall problem could be a faulty idle air control valve or dirty throttle body. The computer uses the valve to adjust base idle speed depending on the load on the engine.

dirty or bad idle air control valve i would at worst the egr valve but most likely the idle air control valve which controls the air and idle from the throttle body try taking it out and cleaning the tip as well as in the throttle body where the control valve goes in if that dosent work replace it and the check engine light does not have to be on for it to be bad.good luck to you.


10 year ford tech here.

The IAC (Idle Air Control) valve is located inline in the air intake assembly.

Hello. Please check your Coolant Temperature Sensor. It tell the PCM what the engine temperature is so that I can adjust the injectors and Air/fuel mixture. If it can't get an accurate temperature it goes to the default level. When you first start the engine it is cold, and the adjustment is good, but when it gets warmer the air molicules are farther apart, this means when warm, air is thinner. Thinner air getting the same amount of fuel means that the air/fule mixture is going to be "richer." or more gas per fuel. That is why your Mountaineer idles higher, same amount of gas, thinner (less) air.. I hope this helps you understand what happens in this system, and why I believe that this amy be your trouble. Thank you for trusting FixYa.com to help get you going! Please rate the solution by your experience, Thank you.

it will be on the intake area depending on the size motor

Sounds like a faulty, IAC valve (idle air control) which controls your idle under load etc. Normally mounted on side of throttle body.Fairly simple for technician to test with ohmmeter to confirm before replacing. If your familiar with ohmmeter, get back to me and I'll guide you through test, otherwise shouldn't cost much for mechanic to test.

check for a vaccum leak on the PVC hose on the intake if there is no problem there the idle air control valve maybe no good also make sure the EGR valve is not open the check engine light sould be on if that was the problem

First Examine the air intake tube( the big black one).there are two silencer chambers on it-one on the side by the elbow and one underneath. I f either one is missing, when the Idle Air Controller (IAC) opens to compensate for the A/C compressor cycling it will make a gurgling/thrumming/roaring sound. if this does not fix it, check around intake/throttle body for loose connections.