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Ihave a 2001 ford f-150 w/4.2 v6. I am receiving a service engine code of p0171 and p0174 which is bank 1 & bank 2 running lean and the possiblities to correct problem seem endless. I have replaced the O2 sensors, fuel filter, spark plugs, PCV valve, cleaned mass air flow sensor with electronic cleaner. Any suggestion to narrow it down to a certain comeponent???

Submitted: 670 days and 20 hours ago.

Category: Car

Value: $9

Status: CLOSED

Optional Information:
2001 Ford F-150 4.2 V6

Already Tried:
answered this question in the original email.

Accepted Answer

There are a couple more possibilities:

One is a bad DPFE sensor on the EGR valve plumging. Somtimes a bad DPFE sensor can under-read EGR flow, causing teh engine computer to increase EGR which has a leanign effect on the fuel mixture. A replacement DPFE sensor costs bout $100 at Ford, or about $50 at an aftermarket auto parts store.

The otehr possibility is a leaky intake manifold, a leaky intake manifold gasket, a leaky PCV hose or loose/leaky vacuum hose connection somewhere. Read the following article for help finding a vacuum leak:

http://www.aa1car.com/library/vacleak.htm

Accepts:
Expert:	Larry
Pos. Feedback:	98.7 %
Answered:	1/22/2008

Automotive technical expert

30 years automotive technical writer, editor & author

670 days and 19 hours ago.

Reply

larry,
I will try those recommendations. If further assistance is needed later will I be able to use you again or will someone else help me??

XXXXXXXXXXXXXX

Posted by Larry 670 days and 19 hours ago.

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Optional Information: 2001 Ford F-150 4.2 V6Already Tried: answered this question in the original email.

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larry, I will try those recommendations. If further assistance is needed later will I be able to use you again or will someone else help me?? XXXXXXXXXXXXXX

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You can request me, or you can put up a post and one of our other experts will take it. It's first come, first serve for answering questions. Who help you depends which experts are online at the time you post your question. If I have answered your basic question, please ACCEPT now. Thanks!

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Optional Information:
2001 Ford F-150 4.2 V6

Already Tried:
answered this question in the original email.

larry,
I will try those recommendations. If further assistance is needed later will I be able to use you again or will someone else help me??

XXXXXXXXXXXXXX

You can request me, or you can put up a post and one of our other experts will take it. It's first come, first serve for answering questions. Who help you depends which experts are online at the time you post your question.

If I have answered your basic question, please ACCEPT now. Thanks!