You need a better mechanic. The EGR system is simple to diagnose for anyone
with a handheld vacuum pump, a scanner, basic understanding how things
work
and a manual.
Now that you replaced the valve and the DPFE (presumably it's not
connected
backwards), we can assume that there is indeed insufficient flow and it is
not caused by a malfunctioning valve. Still quite a few options: bad
regulator (solenoid), no or low vacuum supply to the regulator, an
obstruction between the regulator and the valve, clogged EGR tube (at the
restriction point perhaps)... What should I say? You can keep throwing
parts
at it, or try to diagnose it. Your choice
A very simple test to see that there is no major obstruction anywhere in
the
EGR path is to let the engine idle and force the valve open with a vacuum
pump (or perhaps by smartly sneaking a tee into a vacuum line somewhere).
When the valve opens the engine should stall, or at least hesitate
severely.
"jack" <jackddg22@[EMAIL PROTECTED]
> wrote in message
news:8fWdnUeoWcfOl4PVnZ2dnUVZ_uqdnZ2d@[EMAIL PROTECTED]
>I have a 96 explorer 4.0 ohv with the check engine light on. A scan
>indicates code 401, insufficient flow detected. Mechanic replaced egr
valve
>and cleared the code. CEL came pack on, code 401. I replaced the DPFE
>sensor and both hoses. Blew through both hoses to make sure there was no
>blockage and cleared the code. CEL came back on within 30 miles, same
code.
>HELP!! running out of ideas.
> Jack
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