Forum: 4.0 SOHC / 4.0 OHV Tech
07-07-2018, 06:54 AM
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Replies: 4
Views: 1,856
Re: 98 ranger 4.0 lean in both banks puzzled
It is more than likely your upper intake o-ring gaskets. I have a 1998 4.0 super cab and I had this happen to me,after I changed out the upper intake o-ring gaskets my lean trouble codes p0171 and...
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