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#1
12-31-2010, 06:52 PM
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2000 f150 v-6
My check engine light on. I had the codes read ay autozone and are as follows.
PO171 fuel to lean bank 1 PO174 fuel to lean bank 2 I have changed the egr valve appx. 1 year ago after a PO402 code (excessive flow) I have checked all vacumn lines and replaced the pvc valve once already and would apprecate any advice. The engine pings at times and I notice that the rpms somtimes increase at idle from 900 to about 1200rpms. Other than that it runs great. Thanks in advance! 
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#2
12-31-2010, 07:11 PM
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Re: 2000 f150 v-6
1) Do a smoke test for unmetered air from EGR, PCV,and Air intake system.
2) Did you clean the Massive Air Flow(MAF) with CRC MAF sensor cleaner. 3) Replace upstream H02 sensor.
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#3
12-31-2010, 07:46 PM
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Re: 2000 f150 v-6
1) yes
2) Good possibility 3) Probably not the problem. More than likely if it is not the MAF, it will be a vacuum leak.
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