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Old 01-12-2008
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CEL: P0401...got any advice?

Well recently i'v been having problems with my 96 Ranger 2.3L auto with 138K. CEL (Check Engine Light) came on awhile back...P0402 meaning EGR flow excessive. Not P0401 is on. meaning EGR flow insufficient. I have replace EGR valve, Positioning Sensor, O2 Sensors, etc. Anyone got any other items i can check. All help is greatly appreciated.

Thanks
Terry
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Old 01-17-2008
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Quote:
Originally Posted by USMCWHITENER
Well recently i'v been having problems with my 96 Ranger 2.3L auto with 138K. CEL (Check Engine Light) came on awhile back...P0402 meaning EGR flow excessive. Not P0401 is on. meaning EGR flow insufficient. I have replace EGR valve, Positioning Sensor, O2 Sensors, etc. Anyone got any other items i can check. All help is greatly appreciated.

Thanks
Terry

im not to sure if this setup is like a ford f150, but there is a valve called the dpfe, which controls the vacuum to the egr valve, if that thing got stuck open somehow or is malfunctioning it will cause your problem, to find it just follow the vacuum hose from your egr to it, should have a supply vacuum and a electrical connector to it, and its rectangular in shape and is grey, try replacing that or if you want check for vacuum at egr supply at idle it should be 2 inches or less, if its more, then you know you have found your problem, i hope this helps, looks like you covered all your other bases, this should take care of your problem

luke

btw this is my first post here, just bought me a lil 4 banger ranger
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Old 01-17-2008
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usually if the egr is bad the dpfe goes along with it might as well replace it.

I replaced my egr on my 3.0 for insufficient flow and it was fine for a day then the light came back on so I replaced the dpfe. It was fine then

The guys at ford said its hit or miss usually if the one goes bad the other goes along with it.
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Old 01-18-2008
04 EDGE
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here is your fix, are you ready?

the passage is clogged up with carbon at the intake side.

this is not "hit or miss"

a good tech with the proper equipment and experience with this system can diag it in minutes!

to properly diag this EGR system you need either a live data scanner or a DVOM (digital volt and ohm meter) and a vacuum pump.

the DPFE should read .9-1.2 volts when the EGR valve is closed while the engine is runing, using the vacuum pump attached to the valve the DPFE should read 4-5 volts when the vacuum is applied and the valve is open while the engine is running. if the intake passage is open then the engine will likely stall or stumble.

if you open the egr valve with the vacuum pump and the DPFE does not change and the valve holds vacuum then you have a clogged passage on the intake side of the system, IE intake manifold.

your welcome
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Old 01-31-2008
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not sure what the DPFE is...can someone elaborate for me please...IE - location of this part and what it looks like please. Maybe it will be the part i called the positioning sensor perhaps???

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Old 02-03-2008
04 EDGE
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thats it and thats the "old" style one.

the new "up-dated" ones are plastic.
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Old 02-03-2008
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yup...i bought one off rockauto.com for $77 and some odd change. I dunno if i got a defected part or what....how would i go about checking?
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Old 02-03-2008
04 EDGE
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Originally Posted by 04 EDGE View Post
here is your fix, are you ready?

the passage is clogged up with carbon at the intake side.

this is not "hit or miss"

a good tech with the proper equipment and experience with this system can diag it in minutes!

to properly diag this EGR system you need either a live data scanner or a DVOM (digital volt and ohm meter) and a vacuum pump.

the DPFE should read .9-1.2 volts when the EGR valve is closed while the engine is runing, using the vacuum pump attached to the valve the DPFE should read 4-5 volts when the vacuum is applied and the valve is open while the engine is running. if the intake passage is open then the engine will likely stall or stumble.

if you open the egr valve with the vacuum pump and the DPFE does not change and the valve holds vacuum then you have a clogged passage on the intake side of the system, IE intake manifold.

your welcome
quoting self
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