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2001 Ford F-150 Running lean on 1 and 2 with a miss on one

Tiny
JWOOD60379
  • MEMBER
  • 2001 FORD F-150
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 200,000 MILES
4.2 motor engine light on code is running lean on 1 and 2 with a miss on 1. I have replace all of the 02 sencers, coil pack, fuel pump, throttle body sencer, Missesreal bad at 1500 rpm
Tuesday, November 2nd, 2010 AT 12:40 PM

1 Reply

Tiny
WRENCHTECH
  • MECHANIC
  • 20,757 POSTS
I assume you have PO171 and PO174. On Fords this is nearly always a severe vacuum leak. With the engine idling listen for a hissing noise and follow it to it's source. They are pretty notorious for sucking hole through the rubber connectors and hoses for the PCV and connecting lines.
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Tuesday, November 2nd, 2010 AT 12:53 PM

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