OBD: EGR flow insufficient

[njlarry]

Anyone know what "EGR flow insufficient" error means and where the EGR is on a 2002 Explorer?
Thanks for your help.

 

[thefairlaneman]

Re: OBD: EGR flow insufficient

What is the trouble code number?

 

[Knot Waiting]

Re: OBD: EGR flow insufficient

[Assuming its the more common 4.0l V6] EGR valve is located behind the throttle body on the left side of the engine. Is a disk shaped object with a plastic tube going into the side of it. Usually throws a code when the tube becomes disconnected, loose, colapses or the valve gets dirty.

 

[fishmen111]

Re: OBD: EGR flow insufficient

I assume you are getting a PO401. Usually, you can remove it and knock the carbon out (SeaFoam helps) and put it back on. Also, check the vacuum line going to it. If I remember right, the V6 EGR is in the front/drivers side. V8 is back/drivers side.

 

[njlarry]

Re: OBD: EGR flow insufficient

Thank you all for your help.
Yes it is P0401 and a V6. I will look at it this weekend and let you know.
Thanks again.

 

[gss036]

Re: OBD: EGR flow insufficient

Check the DPFE while there, they cause a lot of different codes for the EGR system.

 

[javsam]

Re: OBD: EGR flow insufficient

I had a 96 ford taurus that gave the same code,thought it might be the EGR too,but turned out to be the Egr sensor.Ford uses a vacuum system on their Egr system and over time the carbon can plug up the egr sensor as well as the Egr.

 

[NelsonQ]

Re: OBD: EGR flow insufficient

According to the OBD-II code site, here is some explanations and things to verify

http://www.obd-codes.com/trouble_co...icient-exhaust-gas-recirculation-flow-egr.php

 

[thefairlaneman]

Re: OBD: EGR flow insufficient

I know a few things about OBD11 issues. First you need a good solid understanding of how each part of the system works IN RELATION TO OTHERS that can be affected by the same trouble code. For example when the computer gives the CEL and the code indicates a malfuntion in one circuit. It doesnt know if in the case of an electrical short where the short is. Is it inside of a sensor causing a sensor failure or is it a small broken wire that feeds or reads the data from the sensor?. Most people just start guessing that one part is bad and replace it, May fix it and may not. OBD11 repairs are not for the novice mechanic most of the time.

 

[njlarry]

Re: OBD: EGR flow insufficient

Thanks for the advice. The OBG code site is great.
I' m still a little confused. Is is the EGR the round hoizontal disc right off the back of the throttle body- it has a wire coming off the top and a metal tube connected to the exhaust and a metal tube right into the throttle body with no rubber hoses connected to it-or is it the rigid round metal manifold like tube that runs along the left side under the trottle body and has a rubber hose connected to the back end?
Also where is the DPFE differential pressure sensor?

 

[moreham]

Re: OBD: EGR flow insufficient

here's a great explanation and the fix, hope iboats is ok with this link, it's not commercial

http://www.motor-mouths.com/cgi-bin/yabb2/YaBB.pl?num=1211854649/0

 

[Knot Waiting]

Re: OBD: EGR flow insufficient

Not sure if this is gonna work but below should be a pic of the EGR on a 4.0l

 

[bootle]

Re: OBD: EGR flow insufficient

"where is the DPFE differential pressure sensor?"

Follow the line from the EGR valve, it's a little rectangular unassuming gismo, go down to one of those automotive supply stores, pick one up and swap it out, they're somewhere around $60-$70, O'Reillys give you a lifetime warranty with it.
90% of the time thats the culprit.

 

[thefairlaneman]

Re: OBD: EGR flow insufficient

Yo man. maybe you need to take it someplace before you break something. know what I mean?

 

[moreham]

Re: OBD: EGR flow insufficient

Yo man. maybe you need to take it someplace before you break something. know what I mean?

nah!! he can do it.
it's a very easy fix, just follow the simple directions in the link above.. it's a piece of cake

 

[njlarry]

Re: OBD: EGR flow insufficient

Update; Tried seafoam just see, did not fix it. Voltages at the DPSE and the EGR selenoid were ok and the DPSE was not clogged so that mainly left the DPSE and the EGR as the main suspects. Every bolt on my engine is metric but the nut holding the vent tube to the EGR looks to be 1 1/4 inch though it is so tight I can't get a caliper much less a wrench on it. As a new DPSE was less than $40 it made sense to try it. Took about 2 minutes to put in and with over 50 miles of mostly highway driving the check engine light is still off.
Hope we got it. Thanks for all your help!

 

[bootle]

Re: OBD: EGR flow insufficient

Yup! That little sensor is always the culprit 9 out of 10 times. Did you cleared the codes ? Or did you just driver the vehicle and allowed it to reset itself?

Whichever way, after 50 miles and the light stays off, i'm sure that you got it solved.

 

[njlarry]

Re: OBD: EGR flow insufficient

I reset the error code. It's now over 100 miles and all seems well.