Cedartown Electronics

Well, after the P0401 code came back on my 4.6L F-150 and after checking
the hoses, EGR valve. vacuum, and throttle body. I replaced the Autozone
DPFE with the original one. (I had saved it since it was not the problem in
the first place (15K miles ago, a clogged throttle body was the problem).
So 250 miles later the "replace engine soon" light is still off. If this
holds true into next week I will purchase NO MORE CRITICAL parts from
Autozone.
Thanks to everyone for the help and maybe this will cure my problem! What
a pain to replace "new parts"!

NOTE: Thanks Jim for reminding me that just because it's new doesn't mean
it is good or works.

Richard


"Jim Warman" <mechanic@telusplanet.net> wrote in message
news:RLNFf.263902$OU5.238212@clgrps13...
> The DPFE sensor is the weakest link in the chain, but you should expect a
> much longer service life than you seem to be getting. Have you been using
> aftermarket or OEM parts? You can test the DPFE with a vacuum pump and a
> DMM.... let me know if you want the procedure...
>
>
> "Cedartown Electronics" <rgrimes@tds.net> wrote in message
> news:d420$43e771d3$943fa388$18290@STARBAND.NET...
> > I know this is off explorer topics, but any help would be appreciated,
> > it's about to get the best of me! Thanks for all of the help on both of
> > my
> > explorers , and my nephews also.
> >
> > 2001 SuperCrew F150 V8 4.6L
> > 140K miles (highway)
> >
> > Problem: P0401 code (insufficient EGR flow) *Main problem!*
> > Light blue smoke on startup (started 137K) probably valve
> > seals.
> > Uses a little oil now. About 1qt in last 3K miles.
> >
> > History: 100K Replaced spark plugs
> > 125K (had P0401 code). Replaced DPFE and EGR valve (EGR
> > valve was still good). Cleaned EGR pipe. Cleaned Throttle
> > body
> > which was completely clogged on the EGR ports.
> > Reset code and it worked fine until now!
> > 137K IAC valve went crazy and was replaced
> > 140K P0401 code came back!
> >
> > Does anyone have any idea what I should try next to remove the P0401
> > (insufficient EGR flow) code? I checked the following things this
> > weekend:
> >
> > 1. All hoses seem fine and have vacuum.
> > 2. DPFE hoses are clean and both have air flow.
> > 3. EGR valve will hold vacuum and the engine runs rough when it is
> > engaged
> > with vacuum at idle. (I think that is one of the tests)
> > 4. The hose to the EGR has pulse vacuum at idle and the EGR solenoid
> > valve
> > has vacuum to it also.
> > 5. I removed/inspected the throttle body again anyway and it appeared
> > "clean", no ports clogged.
> > 6. Reinstalled everything and code came back after about 75miles.
> >
> >
> >
> > What am I overlooking or have not tried? Any help would be
appreciated!
> >
> > Thank you in advance for your help.
> >
> >
> >
> > Richard Grimes
> >
> >
> > --
> > Cedartown Electronics
> > ®RadioShack Dealer 22-A724
> > 1572 North Main St
> > Cedartown, GA 30125
> > (770) 749-0904
> >
> >
>
>