All the sudden the check engine light came on and it started to idle funny and dying at stops. I had a diagnostic done on it and changed out the idle air control valve but it doent seem any different. and the check engine light is still throwing the same code. we adjusted the idle up so i could drive it with out it dying but it is still acting funny.
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The PCM/ECM - engine computer adjusts the idle speed , IAC valve - idle air control valve . Changing the factory base idle will cause check engine light problems . You could have dirty throttle plate , or the idle air control air passage may be also be coked up etc... Videos on youtube for cleaning throttle plate . Try that before causing yourself problems . Quick Tip Throttle Cleaning EricTheCarGuyHow To Fix Car That Idles Poorly
The idle is controlled by the ECM - engine computer ,through the use of the IAC idle air control valve . There is a base idle with IAC disconnected , this is set at the factory . Unless it was changed there is no need to adjust it . If you adjust it with out fixing the underlying problem (IAC valve ) you will have a check engine light coming on that you may never know the cause of . Why do you want to change the idle ? Just trying to help , maybe save you some problems .
Do this service and see if it helps, follow the instructions EXACTLY.
is commonly caused by a dirty automatic idle speed control valve and
throttle valve. Buy a can of throttle valve cleaner (do not use
carburetor spray cleaner!) from NAPA or Carquest (made by CRC
chemicals) and spray it into the air intake while the engine is
running, use up about 1/2 the can, engine will try to stall hold the
speed up, shut it down and let it soak for 30 minutes, restart and
blow out the remaining fluid, shut it down and disconnect the
negative battery cable for 5 Min's to reset the base idle control
Wow you change everything, TPS was right thing to do and so is the Idle air control,and MAF and EGR, fuel pressure, So it idles high then some one tried to defeat the stall in gear? Even if there is a vacuum leak creating high idle it shouldnt stall in gear, , What color is the transmission fluid? when in gear in drive step on the acelerator pedal to maintain idle to prevent car from stalling. Just enough to maintain let say 1100RPM. Is there a vibration? I mean a torque convertor vibration. Torque convertor stall are common an GM and Nissan,very rare do I ever see it on Ford. I really belive the IAC is not getting power and is just been adjusted manually, cause I know its not the transmission, At idle in gear pull the plug on the idle Air control does it change in idle setting? If it doesnt change in Idle setting the adjustment that was use to control the setting lower the idle to its normal setting. Plug the idle air control in then.The idle air should change the setting. If it doesnt its not getting the signal it should.
Sounds like there could be a problem with the idle air control valve, the computer adjusts the idle air control valve with engine load, when you put the car into gear theres a load on the engine the computer has to compensate for the extra load on the engine so what it does it it retracts the pintle valve on the idle air control to allow more air to bypass the throttle plate thus allowing the engine to idle when you place it into gear, i would take out the valve and clean it, it could be carboned up and sticking if that doesnt work i would try and obtain one from a salvage yard, its the cheaper way to go if your on a budget. If the car has a check engine light on have it scanned for trouble codes before you do anything autozone scans the computer for free....
Could be many things. Bad torqe convertor, bad idle air control valve, bad egr valve. So many things it could be. Id spend 60 bucks to get it diagnosed that way your not throwing needless parts at it. Hope this helps
it's on the throttle body. Here's a Quest with same 3.0L engine. These often need cleaning with carb or throttle body cleaner
Idle Air Control (IAC) Valve
When the engine (6007) is running but not at idle, the throttle valve controls the amount of air admitted into the engine. The powertrain control module (PCM) (12A650) increases the fuel injection output in proportion to the increased airflow to achieve the appropriate air/fuel ratio.
During idle, the throttle valve is almost fully closed. It is therefore necessary for the idle air control system to supply air for combustion during idle. The idle air control (IAC) valve allows a metered amount of air to enter the intake manifold (9424). The camshaft position (CMP) sensor detects engine speed and sends a signal to the PCM. The PCM sends a duty cycle (On/Off) signal to the IAC valve which allows additional air to enter the intake manifold. Air is added by the IAC valve to maintain the set lowest idle speed at which the engine can operate.
The idle speed adjusting screw allows adjustment of the airflow into the intake manifold.
Fast Idle Control (FIC) Solenoid
The fast idle control (FIC) solenoid helps maintain a constant idle speed while the air conditioning is operating. When the air conditioning is turned on, the front climate control panel sends out two signals. One signal is sent to the powertrain control module (PCM) (12A650) to engage the A/C compressor (19703). The second signal is a ground signal sent to the FIC solenoid relay, to engage the FIC solenoid. The FIC solenoid supplies additional air to adjust the increased engine load.
try checking your transmission control module for burn't resistors or capacitors also try clearing your tcm by pulling the negative side of your battery off for bout 10 minutes and look for any fuses related to the tcm or ecm in your owners manual