i have a 1999 ford ranger 4.0l 4x4 with p0171 and p0174?
20

Asked by bernierjustin Dec 08, 2013 at 06:20 PM about the 1999 Ford Ranger XLT Extended Cab Stepside SB

Question type: Maintenance & Repair

I have p0171 and p0174 codes, I have replaced the upstream o2 sensors, fuel filler neck, mass air flow sensor, ect temp sensor and I still have the check engine light come on!  I am running out of ideas.  I know the intake is not the problem I have tested that.  what else could it be???

4 Answers
20

bernierjustin answered 10 years ago

how do you check intake gaskets? I have sprayed them with carb cleaner and the truck does not sputter?

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migration_judge_roy answered 10 years ago

Clean the MAIN 1/0 battery cable from the cable to the chassis...wirebrush the end of the cable and wirebrush the chassis....put 'em together for a renewed system ground...the ECU does not work properly when it cannot have steady voltage and steady amperage....reset the trouble codes with a handy 20 dollar scanner~

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30

cmaj answered 9 years ago

Check your fuel filler pipe vent line. Mine was rusted away.

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