Question about 1998 Ford Expedition

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98 expedition with 5.4 skipping under load

I had the code checked and they said it was not enough flow thru EGR valve. I replaced EGR valve and no difference.

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  • Moe May 11, 2010

    Need to know the code number. Moe

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You need to get a DPFE sensor from the dealer also replace the hoses that plug in to it we always replace the EGR controler as well but thats just so we dont see the car or truck back for that problem agin

Posted on Jul 14, 2009

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2 Answers

Where is the egr valve on a 99 Ford expedition


The EGR valve is in a very difficult spot to work on. If the EGR is bad it will set off the check engine light and make the vehicle run rough or stall at idle. It really doesn't make it run rough while driving or accelerating. What are the conditions when the car runs rough?

Mar 01, 2014 | 1999 Ford Expedition

2 Answers

Check engine light code P0401 98 Ford expedition


OBD-II Trouble Code P0401 - Insufficient EGR Flow

EGR stands for Exhaust Gas Recirculation. It is part of the vehicle emmissions system, and is used to reduce combustion temperature and pressure to control Oxides of Nitrogen. There are generally three parts to the EGR system: the EGR valve, an actuator solenoid, and a differential pressure sensor EGR (DPFE). These things work together to deliver the correct amount of recirculation based on engine temperature, load, etc. The P0401 code means that OBD detected an insufficient amount of EGR. You may notice drivability problems such as pinging (a.k.a. pre-ignition knock) when the engine is under load or the vehicle is at higher speeds. There may also be other symptoms.

A code P0401 most likely means one or more of the following has happened:
The DPFE (differential pressure feedback EGR) sensor is faulty and needs to be replaced
There is a blockage in the EGR (tube), most likely carbon buildup
The EGR valve is faulty
The EGR valve may not be opening due to a lack of vaccuum

Check it and keep us updated. Hope this helps (remember to rating this free answer).

Oct 13, 2011 | 1998 Ford Expedition

1 Answer

97 ford expedition cutting off at idle . it was skipping and hesitating under strain . had it checked by a computer and it said egr valve and number 6 cylinder misfire . i changed egr valve , plugs, wires...


pull wire off # 2 see if idle changes if not there s no spark... test coil....test all vacuum lines for leaks also. if all good then idle speed sensor.

Mar 20, 2011 | 1997 Ford Expedition

1 Answer

I have a 98 ford escort check engine said p0401 what do that mean


DTC P0401 - Insufficient EGR Flow

EGR stands for Exhaust Gas Recirculation. It is part of the vehicle emmissions system, and is used to reduce combustion temperature and pressure to control Oxides of Nitrogen. There are generally three parts to the EGR system: the EGR valve, an actuator solenoid, and a differential pressure sensor EGR (DPFE). These things work together to deliver the correct amount of recirculation based on engine temperature, load, etc. The P0401 code means that OBD detected an insufficient amount of EGR.

Symptoms: You may notice drivability problems such as pinging (a.k.a. pre-ignition knock) when the engine is under load or the vehicle is at higher speeds. There may also be other symptoms.

Causes: A code P0401 most likely means one or more of the following has happened:
* The DPFE (differential pressure feedback EGR) sensor is faulty and needs to be replaced
* There is a blockage in the EGR (tube), most likely carbon buildup
* The EGR valve is faulty
* The EGR valve may not be opening due to a lack of vaccuum

Possible Solutions: In fixing this code, it is quite common for people to just replace the EGR valve only to have the OBD code return. The EGR valve is not always the culprit.

* Use a vacuum pump and pull the EGR valve open while monitoring engine RPM's & DPFE voltage. There should be a noticable difference in RPM's with the EGR open
* Clean out the EGR valve and/or tubing to remove deposits
* Check the voltage at the DPFE, compare to specified values (refer to a repair manual for your specific model)
* Replace the DPFE sensor (with a good quality / OEM one)
* Replace the EGR valve

Check and test it; hope helps.

Mar 18, 2011 | Ford Escort Cars & Trucks

2 Answers

I have a 98 Expedition and the check engine light keeps coming on. I pulled the code (P0401. I changed 3 parts DPFE,EGR valve and the Idle air control valve and it still come on. Any suggestions?


I have several ideas. The code 401 is about EGR flow. While it can be an Electric switch like the DPFE that you replaced, the diagnostics do not included the source of the EGR flow or the Backpressure pipe which the vacuum lines from the DPFE operate from.

In short, it is about plain old low tech plumbing. The EGR passage gets its flow from a groove under the Airhorn. If the groove is plugged you need to remove the Airhorn and its gasket and scrape the groove clean. It has about 8 bolts, a $10 gasket and you need to disconnect the Air Intake and a few Electric wires.

Connected to the DPFE are 2 high temperature Vacuum lines. If the tip above does not help, then you need to check this plumbing pipe out for holes. In particular, there is a irregular joint on this pipe which can separate and vent. It should not vent. This will throw off the closed system and generate Error Codes. One end goes towards the exhaust and the other to the EGR.

Finally, do not forget to clear the computer. Old problems stay in the system for 25-35 Startups. I hope my solution has been very helpful to you.

Jan 05, 2011 | 1998 Ford Expedition

1 Answer

Check eng light on low egr flow replace the egr valve and senore check eng light now says evap and low egr flow?


A very common issue that can cause this code is the EGR valve but most commonly the DPFE Sensor differential pressure feedback egr. For the evap code would make sure no lines may have been disconnected while replacing the egr valve. It is possible the the evap code may be a separate issue.

May 31, 2010 | 2000 Ford Expedition

2 Answers

Just changed plugs running well 1 day later service engine soon light appears. Took to parts house code P0401 is what shows cleared code not returned yet


Technical Description

Insufficient EGR Flow

What does that mean?

EGR stands for Exhaust Gas Recirculation. It is part of the vehicle emmissions system, and is used to reduce combustion temperature and pressure to control Oxides of Nitrogen. There are generally three parts to the EGR system: the EGR valve, an actuator solenoid, and a differential pressure sensor EGR (DPFE). These things work together to deliver the correct amount of recirculation based on engine temperature, load, etc. The P0401 code means that OBD detected an insufficient amount of EGR.


You may notice drivability problems such as pinging (a.k.a. pre-ignition knock) when the engine is under load or the vehicle is at higher speeds. There may also be other symptoms.
Causes

A code P0401 most likely means one or more of the following has happened:

* The DPFE (differential pressure feedback EGR) sensor is faulty and needs to be replaced
* There is a blockage in the EGR (tube), most likely carbon buildup
* The EGR valve is faulty
* The EGR valve may not be opening due to a lack of vaccuum

Possible Solutions

In fixing this code, it is quite common for people to just replace the EGR valve only to have the OBD code return. The EGR valve is not always the culprit.

* Use a vacuum pump and pull the EGR valve open while monitoring engine RPM's & DPFE voltage. There should be a noticable difference in RPM's with the EGR open
* Clean out the EGR valve and/or tubing to remove deposits
* Check the voltage at the DPFE, compare to specified values (refer to a repair manual for your specific model)
* Replace the DPFE sensor (with a good quality / OEM one)
* Replace the EGR valve

Jan 13, 2010 | 2002 Ford Expedition

1 Answer

Egr


if its a low flow code replace the DPFE sensor. If you do a resistance check of it it will prabably be out of specs. Also make sure the two hoses are hooked up and arnt cracked. Also blow thru each one to make sure the tubes going into the exhaust arnt clogged. Also make sure the grn hose going to the egr valve is plugged in. Also apply vacuum to the egr valve to make sure it holds vacuum. If it doesnt then the vlave is bad.

Sep 19, 2009 | 2000 Ford Expedition

1 Answer

Getting a code po171 on a '98 ford expedition...O2 sensor? If so whitch one?


CODE PO171 -SYSTEM ADAPTIVE FUEL TOO LEAN. POSSIBLE CAUSE.AIR LEAKS AFTER THE MAF SENSOR OR LEAKS IN THE PVC SYSTEM. EXHAUST LEAKS BEFORE OR NEAR WHERE THE HO2S IS MOUNTED. FUEL INJECTORS RESTRICTED OR NOT SUPPLYING ENOUGH FUEL. FUEL PUMP WEAK. LEAKING EGR VALVE GASKET OR DIAPHRAGM.MAF SENSOR DIRTY CAUSES PCM TO UNDERESTIMATE AIR FLOW / NOW THE BANK 1 SENSOR ITS MOUNTED IN THE EXHAUST SYSTEM BEFORE THE CATALYTIC CONVERTER.THE BANK 2 SENSOR IS IN EXHAUST AFTER THE CATALYTIC CONVERTER.

Aug 27, 2009 | 1998 Ford Expedition

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