2001 Ford F150 171 and 174 codes

2001 FORD F-150
200,000 MILES • 6 CYL • 2WD • AUTOMATIC
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HERBWALLACE
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  • 1 POST
hello. i have a 01 f-150 v6. it has two codes. 171 and 174. it runs real rough. smooths out under hard acceleration. seems like two or more cylinders are misfiring. any sugg? i don't think itsthe MAF because it seems to be working properly. vacuum leak at intake manifold elbow?
Jan 7, 2009 at 4:03 PM
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JACOBANDNICKOLAS
  • ✓ASE Certified Mechanic
  • 110,194 POSTS
  • ASE Certified Mechanic
Hi:
Don't disregard the MAF. Look for induction air leaks, vacuum or some kind fuel restriction, weak fuel pump, restricted fuel filter etc........ first culprits. You also could have an exhaust leak near the upstream o2 sensor.
Jan 10, 2009 at 12:25 AM
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