Question about the EGR valve and Code 337 | Ford Explorer - Ford Ranger Forums - Serious Explorations

  • Register Today It's free! This box and some ads will disappear once registered!

Question about the EGR valve and Code 337

Dash Riprock

Active Member
Joined
April 9, 2005
Messages
72
Reaction score
0
City, State
LA, CA
Year, Model & Trim Level
95 Explorer XLT
95 XLT 4.0 OHV

The CEL came on recently with no change in performance or drivability.

Checked codes and got:

KOEO: 337
KOER: 337
CM: 337, 122

The 122 is a TPS low code, one that I have had in the past (http://www.explorerforum.com/forums/showthread.php?t=159369).

337
(O,R,M)
EGR feedback signal is/was was high - EVR

This past weekend I did the much debated TPS voltage adjustment, initially found it to be .90 vdc, and adjusted TPS to read .98 vdc. After disconnecting battery and driving, the CEL relit, with the 337 code repeating in KOEO, KOER, and CM, but the 122 code gone. (Somehow I doubt this was the source of the 122 code, we'll see)

My DPFE was replaced last July.

So, what does a code 337 ask me to do? Is there a standard procedure to fix this? Simply replace EGR valve after checking wiring?

My wife actually took this for her smog check while the CEL light was on and it passed.

Hints and suggestions welcomed. Thanks
 
<

Join the Elite Explorers $20 Gets rid of the ads!

Elite Explorer members see no advertisements, no banner ads, no double underlined links, can add their own profile photo, upload photo attachments in all forums, and Media Gallery, create and save more private conversations, and more. Join Today. Your support is greatly appreciated.




BrooklynBay

Moderator & long time member.
Staff member
Moderator
Elite Explorer
Joined
November 11, 2005
Messages
55,304
Reaction score
736
City, State
Brooklyn, NY
Year, Model & Trim Level
88 89 93 95 96 Aerostars
<



Dash Riprock

Active Member
Joined
April 9, 2005
Messages
72
Reaction score
0
City, State
LA, CA
Year, Model & Trim Level
95 Explorer XLT
Maybe the EGR is defective (stuck), or the inlet is clogged. Check the vacuum line going to the DPFE for a leak. Moisture kills the DPFE.


Ill do that.

Im wondering what the actual effect is of the fault. What happens if I ignore it and drive around with it sending this code? So far, I cant see any difference in how the engine behaves. hey it passed smog, how bad can it be?

Knowing me though, Ill keep tinkering with it.
 
<



BrooklynBay

Moderator & long time member.
Staff member
Moderator
Elite Explorer
Joined
November 11, 2005
Messages
55,304
Reaction score
736
City, State
Brooklyn, NY
Year, Model & Trim Level
88 89 93 95 96 Aerostars
<



Dash Riprock

Active Member
Joined
April 9, 2005
Messages
72
Reaction score
0
City, State
LA, CA
Year, Model & Trim Level
95 Explorer XLT
Thanks Brooklyn. What pisses me off is that my DPFE is less than a year old, and I didnt keep the receipt!

Still, Ill check the EGR valve and do the vacuum troubleshooting and see what pops up.
 
<



Dash Riprock

Active Member
Joined
April 9, 2005
Messages
72
Reaction score
0
City, State
LA, CA
Year, Model & Trim Level
95 Explorer XLT
Just an update to this.

I changed the DPFE, again, and it fixed the problem. The reason I was looking deeper is because I didnt think a one year old DPFE would fail.

The unit was from Autozone by the way. Ill see if the replacement from them fairs any better.
 
<



Top