Question about 2000 Ford Expedition
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.
EGR Valve Control Solenoid
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.
Posted on Sep 27, 2010
It means that the DPFE sensor is probably no good. These are a well known to fail. The easiest way to check them is with a scan tool. Key on engine off the voltage should be less that a volt. Unplugged you should see 5 volts. With the engine running apply vacuum to the EGR valve. The engine should start to run ruff or even stall and the DPFE voltage should rise.
If the engine stalls and the voltage does not rise than the DPFE is bad (make sure you check the 2 hose in between the sensro and the EGR tube. If they are cracked or melted those need to be replaced first.
If the engine doesn't stall than the EGR passages are plugged, almost never happens.
Its a pretty safe bet that the sensor is bad but it could always be something else.
Posted on Sep 27, 2010
Catylitic converters stopped up i just went thru the same thing on my1997 ford expidition insufficient flow thru egr
Posted on Jun 20, 2013
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Posted on Jan 02, 2017
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