2001 Ford F-150 171 and 174 codes

Tiny
HERBWALLACE
  • MEMBER
  • 2001 FORD F-150
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 200,000 MILES
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?
Wednesday, January 7th, 2009 AT 4:03 PM

1 Reply

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 110,052 POSTS
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.
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Saturday, January 10th, 2009 AT 12:25 AM

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