93 F-150 ENGINE STALLS - KOER CODE 311

  • Tiny
  • roargan
  • 1993 All Other Makes

My f-150 has 150000 miles and recently started stalling when first started it acts flooded untill I rev it up hard then comes out of it. Some days it will stall at every stop then run fine for up to a week. I ran the codes and 311 air system not functioning came up.
the air pump was noisy so I replaced it. The problem hasen't changed and the code is still there. Could it be the air bypass valve and would this cause the stalling?

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Friday, October 27th, 2006 AT 4:44 PM

3 Replies

  • Tiny
  • Steve in Tennessee
  • Member

Did you ever resolve your code 311 issue? I have the same code and am looking for clues.
Thanks,
Steve (steve@soozfa. Net)

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Saturday, January 14th, 2012 AT 12:59 AM
  • Tiny
  • CJ MEDEVAC
  • Expert
  • 9,240 posts

I'M OT REL UP ON THESE COMPUTER RUN CARS

I DID LOCATE THE CODE MEANING:

AIR system not working - Single, Right or Rear HO2S - Air Injection

DOES THIS HELP YOU ANY?

THE MEDIC

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Saturday, January 14th, 2012 AT 5:10 AM
  • Tiny
  • Steve in Tennessee
  • Member

Thanks for the reply. Just wondering if you ever resolved the code? I'm beginning to believe the emission system is a boat anchor after a few years and does not contribute to performance with the exception of smog emission.

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Saturday, January 14th, 2012 AT 4:57 PM

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