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1987 - 1996 F150 & Larger F-Series Trucks 1987 - 1996 Ford F-150, F-250, F-350 and larger pickups - including the 1997 heavy-duty F250/F350+ trucks

Check Engine light p0174 p0171

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Old Apr 29, 2016 | 11:05 PM
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Benjamin Silva
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Check Engine light p0174 p0171

Hey guys! My truck starts rough, and by rough I mean it sounds like a 4 cyl and stumbles and hicups. It only does it for a few seconds and then it runs perfect. I do currently get low MPG's and not as much power as I think I should have. My check engine light has come on and it is throw the codes: p0171, p0174 both as a fault code and not a pending code. I have currently just changed the o2 sensor behind the cat, cleaned maf sensor, and changed the fuel filter. I really need your guys help! It's a 1996 F150 4.9l 5 speed 4x4.
 
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Old Apr 30, 2016 | 09:00 AM
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BLDTruth
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Originally Posted by Benjamin Silva
Hey guys! My truck starts rough, and by rough I mean it sounds like a 4 cyl and stumbles and hicups. It only does it for a few seconds and then it runs perfect. I do currently get low MPG's and not as much power as I think I should have. My check engine light has come on and it is throw the codes: p0171, p0174 both as a fault code and not a pending code. I have currently just changed the o2 sensor behind the cat, cleaned maf sensor, and changed the fuel filter. I really need your guys help! It's a 1996 F150 4.9l 5 speed 4x4.
Check for vacuum leaks and a properly functioning EGR valve.
 
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