1999 FORD EXPEDITION 2WD 4.6L EGR VALVE,EGR CONTROL &EGR POSITION SENSOR REPLACED NO FIX STILL BAD FOW CLEANED HOSES

wow I wish ford could make a egr system that wouldn't fail as I've seen this one go a lot lately ! anyways the code is for insufficient flow in the egr system , this is a means to recirculate some of your exhaust back into your intake , as a means to reburn some of your excess fuel (emissions) , anyways it consists of a means to meter some of the exhaust , and control it (off/on) also to measure the amount that goes in , its part of the closed loop of the fuel inlet system , the fault code is specifically saying flow sensor cant detect any flow in the pipe , there can be a few causes for this including a bad flow sensor , all are from my opinion a poorly designed system (it doesn't self clean it's self ) as almost a guaranty every 60k miles your gonna have some problem with it

Definition of Diagnostic Trouble Code P1406 Audi: EGR Temperature Sensor Range/Performance BMW: Heated Catalyst Internal Control Module Checksum/ROM Error Buick: EGR Valve Pintle Position Circuit Cadillac: EGR Valve Pintle Position Circuit Chevrolet: EGR Valve Pintle Position Circuit Ford: Differential Pressure Feedback Sensor Downstream Hose Off Or Plugged GMC: EGR Valve Pintle Position Circuit Isuzu: EGR Valve Pintle Position Circuit Lincoln: Differential Pressure Feedback Sensor Downstream Hose Off Or Plugged Mazda: DPFE Sensor Downstream Hose Off Or Plugged Mercury: Differential Pressure Feedback Sensor Downstream Hose Off Or Plugged Oldsmobile: EGR Valve Pintle Position Circuit Pontiac: EGR Valve Pintle Position Circuit Saturn: EGR Valve Pintle Position Circuit Toyota: Turbo Pressure Sensor Range/Performance Problem Volkswagen: EGR Temperature Sensor Range/Performance Volvo: Termperature Warning > 100 degrees C

Check/replace the idle air control valve.

Follow the hose it runs to the DPFE (egr position sensor). See if hoses are cracked, shrunk or missing. There is an in & out. They need to be a special silicone vacuum hose made for this setup. Usually the replacement silicone vacuum hose is orange. It is available at most autoparts stores. If all sections of hose are ok, either DPFE (egr position sensor) or egr solenoid is bad. There should be a check engine light on for any one of these problems as they each have their own code.

1996 Ford Explorer 2WD 5.0L

Canister Purge Valve
Catalytic Converter

EGR Position Sensor

EGR Vacuum Solenoid

EGR Valve

EGR Valve Gasket

EGR Valve Pressure Sensor

Exhaust Manifold

Exhaust Manifold Gasket

Fuel Cap

Muffler - Performance

Oxygen Sensor

PCV Valve

Sensor - Ambient Air Temperature

Smog Pump

You have carbon built up inside the port on the intake manifold remove the valve and clean it out and the problem should stop

Exhaust gas recirculation flow reduced. Could be caused by valve or gunk in the flow path. I'll paste a little bit about troubleshooting below. If you need specific instructions for repairing your system, please reply with your engine size/type.

The Exhaust Gas Recirculation (EGR) system is designed to reintroduce exhaust gas into the combustion chambers, thereby lowering combustion temperatures and reducing the formation of Oxides of Nitrogen (NO x ).
The amount of exhaust gas that is reintroduced into the combustion cycle is determined by several factors, such as: engine speed, engine vacuum, exhaust system backpressure, coolant temperature, throttle position. All EGR valves are vacuum operated. The EGR vacuum diagram for your particular vehicle is displayed on the Vehicle Emission Control Information (VECI) label.
The EGR system is Differential Pressure Feedback EGR (DPFE) system, controlled by the Powertrain Control Module (PCM) and composed of the following components: DPFE sensor (also referred to as the backpressure transducer), EGR Vacuum Regulator (EVR) solenoid, EGR valve, and assorted hoses.

COMPONENT TESTING

DPFE Sensor

1. Disconnect the pressure hoses at the DPFE sensor.
2. Connect a hand vacuum pump to the downstream pickup marked REF on the sensor.
3. Using a multimeter, backprobe the SIG RTN circuit at the DPFE connector.
4. With the ignition ON , signal voltage should be 0.20-0.70 volts.
5. Apply 8-9 in. Hg of vacuum to the sensor. Voltage should be greater than 4 volts.
6. Quickly release the vacuum from the sensor. Voltage should drop to less than 1 volt in 3 seconds.
7. If the sensor does not respond as specified, check the power and ground circuits.
8. If power and ground circuits are functional, the sensor is faulty.

EGR Valve Control Solenoid

1. Remove the EVR solenoid.
2. Attempt to lightly blow air into the EVR solenoid.
   1. If air blows through the solenoid, replace the solenoid with a new one.
   2. If air does not pass freely through the solenoid, continue with the test.
   
   
3. Apply battery voltage (approximately 12 volts) and a ground to the EVR solenoid electrical terminals. Attempt to lightly blow air, once again, through the solenoid.
   1. If air does not pass through the solenoid, replace the solenoid with a new one.
   2. If air does not flow through the solenoid, the solenoid is OK.
   
   
4. If the solenoid is functional but the problem still exists, check the power and ground circuits.

EGR Valve

1. Install a tachometer on the engine, following the manufacturer's instructions.
2. Detach the engine wiring harness connector from the Idle Air Control (IAC) solenoid.
3. Disconnect and plug the vacuum supply hose from the EGR valve.
4. Start the engine, then apply the parking brake, block the rear wheels and position the transmission in Neutral.
5. Observe and note the idle speed.

If the engine will not idle with the IAC solenoid disconnected, provide an air bypass to the engine by slightly opening the throttle plate or by creating an intake vacuum leak. Do not allow the idle speed to exceed typical idle rpm.

1. Using a hand-held vacuum pump, slowly apply 5-10 in. Hg (17-34 kPa) of vacuum to the EGR valve nipple.
   1. If the idle speed drops more than 100 rpm with the vacuum applied and returns to normal after the vacuum is removed, the EGR valve is OK.
   2. If the idle speed does not drop more than 100 rpm with the vacuum applied and return to normal after the vacuum is removed, inspect the EGR valve for a blockage; clean it if a blockage is found. Replace the EGR valve if no blockage is found, or if cleaning the valve does not remedy the malfunction.
   
   

Exhaust gas recirculation flow excessive. First things to check is your vacuum hoses to egr position sensor (Dpfe sensor) Egr solenoid & egr valve. If they are off, melted or sucked in they need to be replaced. Usually a specific code will be set for that but not always. Of the three the dpfe sensor also known as egr position sensor is the most common & easiest to replace. Next in order is the egr solenoid. Lastly if it comes to changing egr valve make sure to clean all carbon build up in cavity that egr mounts to. They commonly plug up.

Sounds like a vacuum leak. Look for obvious vacuum hoses broken,squished or off. Check at egr valve, dpfe sensor & solenoid. These are all common to go bad. If not obvious take carb cleaner with snorkel attached, spray intake manifold & hoses etc. If idle raises while spraying you located vacuum leak. The propelent in the can temporarily seals leak while its being sprayed. Be careful not to spray on wires or anywhere there is a spark.

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 DPF EGR sensor
• DPF EGR sensor downstream hose off or plugged
• EGRVR circuit open to PCM
• VPWR open to EGRVR solenoid
• DPF EGR sensor hoses both off
• DPF EGR sensor hoses reversed
• Damaged EGR orifice tube
• Damaged EGRVR solenoid
• Damaged PCM

P1299 - Cylinder Head Over Temperature Protection Active Indicates an engine overheat condition was detected by the cylinder head temperature (CHT) sensor. An FMEM Strategy called Fail-safe Cooling was activated to cool the engine.

• Engine cooling system concerns
• Low engine coolant level
• Base engine concerns

P0300 - Random Misfire The random misfire DTC indicates multiple cylinders are misfiring or the PCM cannot identify which cylinder is misfiring.

• Camshaft position sensor (CMP)
• Low fuel: less than 1/8 tank
• Stuck open EGR valve

P0443 - EVAP Control System Canister Purge Valve Circuit Malfunction The PCM monitors the EVAP canister purge valve circuit for an electrical failure. The test fails when the signal moves outside the minimum or maximum allowable calibrated parameters for a specified purge duty cycle by PCM command.

• VPWR circuit open
• EVAP canister purge valve circuit shorted to GND
• Damaged EVAP canister purge valve
• EVAP canister purge valve circuit open
• EVAP canister purge valve circuit shorted to VPWR
• Damaged PCM

P1451 - EVAP Control System Canister Vent Solenoid Circuit Malfunction Monitors the canister vent (CV) solenoid circuit for an electrical failure. The test fails when the signal moves outside the minimum or maximum allowable calibrated parameters for a specified canister vent duty cycle by PCM command.

• VPWR circuit open
• CV solenoid circuit shorted to PWR GND or CHASSIS GND
• Damaged CV solenoid
• CV solenoid circuit open
• CV solenoid circuit shorted to VPWR
• Damaged PCM

P1309 - Misfire Monitor Disabled When the misfire monitor is disabled, usually due to the input signal generated by the camshaft position (CMP) sensor, by sensing the passage of teeth from the CMP wheel.

• Camshaft position sensor
• Powertrain control module
• ECT, MAF, and CKP sensors

with the codes you have here I would look in the direction of the egr valve first because that will cause the bucking and stalling, and the misfires, but so will the canister vent solonoid. the misfire codes and the cylinder overtemp code could be from overheating or because if the misfires.