P0401 Egr Flow Insuffcient
Elder User
Joined: Oct 2003
Posts: 914
Likes: 0
From: Tampa Fl
lol i thought you maybe did see it...i drove up 579 to i-4 then hit a u turn and blasted back twards skewlee at mach 1 to see if it would run better...it did run a bit better but i think theres more than that under there. I picked it up for $5 at discount auto on 301 
New User
Joined: Sep 2010
Posts: 3
Likes: 0
I hate to sound dump on my first post.(2002 Explorer 4.0) I have had the the P0401 for a number of months. As soon as it started I changed the egr and it came back on I then changed the PDFE and again it came back on. After reading on this form for a couple of days I decided to pull the throttle body and intake to clean the ports in the intake for the EGR. Mr smart guy got the new egr and throttle body gasket as well as the 6 manifold seals. Here in is the problem....where the heck are the ports I could not find them. Could some one tell me where they are and how many there should be. I looked and looked sprayed TB cleaner scrapped around and still did not find them. Put it all back together and within 15 miles it was back on. OK so someone give me a road map to those little buggers before I pull it down again next weekend. Thanks
Postmaster
Joined: Aug 2001
Posts: 4,532
Likes: 5
From: Trussville, Alabama
Wish I could help but I think you made a mistake and posted in the wrong forum.
If you have an Explorer with the 4.0, you messed up. This is the 3.8 and 4.2 forum. All together different engines compared to the 4.0 SOHC and DOHC engines.
Give the guys a shout in that forum and maybe they can help.
If you have an Explorer with the 4.0, you messed up. This is the 3.8 and 4.2 forum. All together different engines compared to the 4.0 SOHC and DOHC engines.
Give the guys a shout in that forum and maybe they can help.
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