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International Automotive Technicians Network
Re: 1998-F150 codes p0171-p0174
Posted to Technical Discussion Forum on 9/26/2003

Hi Tommy,

What are the trims at cruise speed, say half throttle? If trim is closer to normal seems vaccume leak might be the answer. If trim is still high, take a closer look at pressure / volume..

You say fuel pressure is good, meaning you used a gauge? ... Login to read more.