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Old 05-18-2015
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I am: Maurice Jones
Join Date: May 2015
Location: Salem, IN
Vehicle: 2004 Ford Ranger
Drive Type: 4x4
Engine: 4.0
Posts: 25
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04 4.0 EGR Diagram

Does anyone have a diagram for the EGR setup on the '04 4.0? I'm trying to see if someone tried to bypass the EGR on my '04 I just bought.

I keep getting a P0401 but the elbow going into the intake is fine and the DPFE looks new.

Thanks in advance.
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Old 05-18-2015
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I am: Ron Dean
Join Date: Jan 2014
Location: Vancouver, BC
Vehicle: 1994 Ford Ranger
Drive Type: 4x4
Engine: 4.0
Posts: 4,756
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EGR valve has vacuum hose to EGR Modulator(computer controls this to send vacuum to EGR Valve)
EGR Modulator has another vacuum hose to intake manifold

That is it, just those 2 hoses in the vacuum part of the system.

I did do a more detailed response to your question over at TheRangerStation(TRS)
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Old 07-11-2015
I am: Guy Quigley
Join Date: Aug 2010
Location: Round Rock
Vehicle: 2002 Ford Ranger XLT
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I know this is a late reply but most of the time it is the DPFE. It has two vacuum hoses and one electrial plug with three prongs on the inside. One of the vacuum lines is larger than the other. I chased this problem also and ended up replacing the EGR, the egr solenoid, and finally the DPFE.
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