Happy Traveler wrote:
> 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
>
>
Yep, new mechanic is on order!!(already figured that one out). Think i
found the problem about 2 min after the post. A disconnected vacuum line
to the egr valve.
Thanks,
Jack
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