EGR Valve
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Junior Member
Joined: Feb 2006
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From: California
EGR Valve
I just got a Service Engine Soon light on my truck. Its a 2001 Screw 4.6
The code was P0401, Insufficient EGR Flow.
I'm trying to remove it to check it out.....HOW DO I DO THAT? ARGGGGHHHH.
I've gotten as far as the two screws holding it in, but the metal pipe its connected to doesn't budge...do i have to remove it along with the valve, or is there a way to remove the valve only?
Any help is greatly appreciated!
The code was P0401, Insufficient EGR Flow.
I'm trying to remove it to check it out.....HOW DO I DO THAT? ARGGGGHHHH.
I've gotten as far as the two screws holding it in, but the metal pipe its connected to doesn't budge...do i have to remove it along with the valve, or is there a way to remove the valve only?
Any help is greatly appreciated!
Technical Article Contributor
Joined: May 2004
Posts: 6,509
Likes: 6
From: Georgia on my mind...
More than likely, you've got a faulty DPFE sensor and/or clogged EGR ports. The EGR valve rarely fails in these engines nowadays. Search for DPFE in the engine forum or P0401, and you'll get some good info on where to go and why.
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Joined: Sep 2003
Posts: 1,104
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From: WY
The EGR valve seldom goes bad. To get the exhaust pipe off of it, try spraying some PB Blaster on the fitting. Good idea to put some anti-seize compound on the threads when putting it all back together. Makes it a lot easier to take off if you have to do it again.
Code 401 is most often clogged EGR ports. There are normally two ports going from the EGR vavle going through the intake elbo. These ports get clogged with carbon. Just take off the elbo and clean out the ports. It's a pretty easy job.
The DPFE often goes bad at the same time the ports get clogged. The hoses going to the DPFE look the same but are have different internal diameters. Make sure you match up the correct hose (one large, one small). The new DPFE sensor may not have the big and small inputs in the same position (left side, right side) as your original sensor.
Code 401 is most often clogged EGR ports. There are normally two ports going from the EGR vavle going through the intake elbo. These ports get clogged with carbon. Just take off the elbo and clean out the ports. It's a pretty easy job.
The DPFE often goes bad at the same time the ports get clogged. The hoses going to the DPFE look the same but are have different internal diameters. Make sure you match up the correct hose (one large, one small). The new DPFE sensor may not have the big and small inputs in the same position (left side, right side) as your original sensor.
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Junior Member
Joined: Feb 2006
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From: California
"There are normally two ports going from the EGR vavle going through the intake elbo. These ports get clogged with carbon. Just take off the elbo and clean out the ports. It's a pretty easy job."
i'm not mechanically inclined at all. what is or what does the intake elbo look like and how do i remove it to clean it?
Where do I find the DPFE and how do I know if its good or bad?
SORRY.
i'm not mechanically inclined at all. what is or what does the intake elbo look like and how do i remove it to clean it?
Where do I find the DPFE and how do I know if its good or bad?
SORRY.
Senior Member
Joined: Sep 2003
Posts: 1,104
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From: WY
Originally Posted by chevyblows-jr.
"There are normally two ports going from the EGR vavle going through the intake elbo. These ports get clogged with carbon. Just take off the elbo and clean out the ports. It's a pretty easy job."
i'm not mechanically inclined at all. what is or what does the intake elbo look like and how do i remove it to clean it?
Where do I find the DPFE and how do I know if its good or bad?
SORRY.
i'm not mechanically inclined at all. what is or what does the intake elbo look like and how do i remove it to clean it?
Where do I find the DPFE and how do I know if its good or bad?
SORRY.
You really don't have to be mechanically inclined for this fix. You're only taking off superficial components and not really digging into the engine. The best advice I can give is to go buy a manual for your truck at Autozone for $15. It'll have a picture of the engine pointing out the EGR valve, DPFE sensor and such with directions on their removal. You can take apart the whole system with a socket set, 1" wrench and a common screw driver. I would clean out the EGR vents before changing the DPFE. If the check engine light doesn't go out after a few days, you can ops check the DPFE with a cheap multi-meter (as explained in the manual you just bought).