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Re: Off topic F150 question
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
>
>
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