97 4.6l running rough
Technical Article Contributor
Joined: Oct 2005
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From: MI
Pulled the hoses off of the DPFE, the ends on the sensor looked gunked up. Used the compressor to blow the lines clear, used steel wool on the sensor to clean the outside of the tubes and a small screwdriver to clean the insides reconnected and WOW! Its running strong. The miss is history and no more check engine light. Going out for a drive, Thanks for the help.
Don't blow air into there. The DPFE is a ceramic, capacitive type pressure transducer. You'll screw it up.
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Joined: Dec 2011
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From: Durham, NC
The '97 - '03 DPFE sensors generate a signal between 0V and 5V. I do agree that you shouldn't blow compressed air into it.
Technical Article Contributor
Joined: Oct 2005
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From: MI
That's correct. There's two signal wires w/a VRef,- 97-03. And that's only true when the pressure differential is @ 0. Actual is between .45 and 4.5 Sig/Sig Return, to narrow it down even more.
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From: Durham, NC
There is actually only 1 signal wire (single ended) the sig return is a GND reference for the comparator in the PCM.
Technical Article Contributor
Joined: Oct 2005
Posts: 25,641
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From: MI
Pin 1 = DPFE/Signal
Pin 2 = Signal Return
Pin 3 = VRef
Simple version. Two hoses, one on each side of the pipe orifice. EACH hose samples the pressure on EACH side of the orifice (upside and the downside). The PCM NEEDS two signals for comparisons in order to compute the gas flow through the EGR pipe and make the accurate adjustments to engine operation.
I'm not lyin to yuh man.
Pin 2 = Signal Return
Pin 3 = VRef
Simple version. Two hoses, one on each side of the pipe orifice. EACH hose samples the pressure on EACH side of the orifice (upside and the downside). The PCM NEEDS two signals for comparisons in order to compute the gas flow through the EGR pipe and make the accurate adjustments to engine operation.
I'm not lyin to yuh man.
Senior Member
Joined: Dec 2011
Posts: 443
Likes: 0
From: Durham, NC
Pin 1 = DPFE/Signal
Pin 2 = Signal Return
Pin 3 = VRef
Simple version. Two hoses, one on each side of the pipe orifice. EACH hose samples the pressure on EACH side of the orifice (upside and the downside). The PCM NEEDS two signals for comparisons in order to compute the gas flow through the EGR pipe and make the accurate adjustments to engine operation.
I'm not lyin to yuh man.
Pin 2 = Signal Return
Pin 3 = VRef
Simple version. Two hoses, one on each side of the pipe orifice. EACH hose samples the pressure on EACH side of the orifice (upside and the downside). The PCM NEEDS two signals for comparisons in order to compute the gas flow through the EGR pipe and make the accurate adjustments to engine operation.
I'm not lyin to yuh man.
