What cause my engine not to start.turn over strong

P1121 Ford Throttle Position Sensor Inconsistent with Mass Air Flow Sensor
http://engine-codes.com/p0401_ford.html no they are not related !
Are there any cracks in the rubber hose from air cleaner to throttle body ! That could cause the P1121 air entering after mass air flow sensor !
P1121 - Throttle Position (TP) Sensor Inconsistent with MAF Sensor The PCM monitors a vehicle operation rationality check by comparing sensed throttle position to mass air flow readings. If during key ON engine running self-test the comparison of the TP sensor and MAF sensor readings are not consistent with calibrated load values, the test fails and a diagnostic trouble code is stored in continuous memory.

• Air leak between MAF sensor and throttle body
• TP sensor not seated properly
• Damaged TP sensor
• Damaged MAF sensor

Drive vehicle and exercise throttle and TP sensor in all gears. A TP PID (TP V PID) less than 4.82 % (0.24 volt) with a LOAD PID greater than 55% or a TP V PID greater than 49.05% (2.44 volts) with a LOAD PID less than 30% indicates a hard fault. P0401 - EGR Flow Insufficient Detected The EGR system is monitored during steady state driving conditions while the EGR is commanded on. The test fails when the signal from the DPF EGR sensor indicates that EGR flow is less than the desired minimum.

• Vacuum supply
• EGR valve stuck closed
• EGR valve leaks vacuum
• EGR flow path restricted
• EGRVR circuit shorted to PWR
• VREF open to D.P.F. EGR sensor
• D.P.F. EGR sensor downstream hose off or plugged
• EGRVR circuit open to PCM
• VPWR open to EGRVR solenoid
• D.P.F. EGR sensor hoses both off
• D.P.F. EGR sensor hoses reversed
• Damaged EGR orifice tube
• Damaged EGRVR solenoid
• Damaged PCM

Perform KOER self-test and look for DTC P1408 as an indication of a hard fault. If P1408 is not present, look for contamination, restrictions, leaks, and intermittents

Not sure if this will help but i had a similar problem on an 85 Lincoln Town car right from the first week i bought it, hitting the dealership for warranty almost weekly because of this problem it took them 2 years to figure out it was a problem caused by built up carbon particles that were getting lodged in the EGR valve which was cone shaped, there by not allowing the valve to close properly and giving a false sensor reading to the engine and causing it to shut down, Once the ignition was turned off it would start again and run normally for anywhere between a few hours to a few days then do it again. To solve the problem they custom built a small screen to go in front of where the intake line to the EGR is and that seemed to solve the problem. I was told it had happened to other Ford and Lincoln vehicles as well with the V8 throttle body injection fuel system.

Possibilities:

1. Leak in intake manifold or deteriorated throttle body gasket;
2. Loose or missing throttle body spring;
3. Defective idle air bypass valve;
4. Bad throttle position sensor;
5. Bad EGR valve or EGR position sensor;
6. Evil aliens.

If there is, or has recently been, a CHECK ENGINE light showing, have the stored codes read out. They may reveal the culprit or, at least, indicate where to begin looking.

The TPS (Throttle Position Sensor) is actually easy to replace - it is located on the throttle body on the engine and is attached to the throttle linkage and flapper valve inside the throttle body. If you have a decent code scanner, you can actually view the position of the throttle as you move the linkage to see if it is tracking linearly with no gaps. This condition can also be caused by a stuck or faulty EGR (Exhaust Gas Recirculation) valve, regardless of its age. Recheck all codes to be sure you are still getting these errors.

My experience has been with later model vehicles, but a bad throttle position sensor most definetly causes this type of situation. Two torx screws, opposite side if the throttle body, should have a three wire plug.

The throttle body is coated with a sludge resistant material. If you cleaned it all out you are actually hurting your engines performance, because the throttle body resists sludge which in turn protects your throttle plate and bore. You may want to check your egr vacuum regulator, for the cause of your problem.

Engine size? year? This code is for insufficient egr, usually caused by clogged egr passeges or a bad DPFE sensor. Open egr valve, if the engine idles real rough or stalls, replace the DPFE sensor. If the idle does not change, then take the egr valve off and clean the passages. You cant just keep changing parts hoping you get lucky and change the correct one.

relace the throtle air idle valve.The temp switch will allso cause this problem.

If there is a Auto Zone around your area, have them scan the Explorer for any DTC codes since it's fee of charge. But in the mean time buy a can of MAF cleaner and follow the instructions and also buy a can of Trottle body cleaner and follow the instructions on the can. Clean the MAF and the Throttle body, also try to get the Idle Air Control falve cleaned too which is on the throttle body. So use up the whole can of Throttle body cleaner and it would not hurt to use two cans. Once everything is cleaned that should fix the problem, the other thing to that would cause your poor idle and stalling is a bad or dirty EGR valve which can be cleaned with Carburetor cleaner since it's stronger then the Throttle body cleaner, just remove the EGR and spray the Carbon build away and place back in place. Note: the Carb cleaner is to strong for the gaskets used on the throttle body so don't use it on the throttle body. Good luck and this should help get your Explorer running 100% soon.

This throttle body has a TPS ( throttle position sensor) and a Accelerator pedal sensor on it. The TPS is on the drivers side and the APS is on the pass side of the throttle body. When this happened your check engine lite came on then went off when it warmed up and acted normally. The code is still in History codes. Check it with a scan tool. I foget the code number but if it come up with the APS code in History, replace that sensor....not the TPS. It is a sealed sensor that gets moisture in it when the seal deteriates and it freezes in very cold weather.