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97 Ford F-150 running lean

Tiny
CCORUM04
  • MEMBER
  • 1997 FORD F-150
  • V8
  • 2WD
  • AUTOMATIC
  • 97,000 MILES
I have a 97 Ford F150 that the light was on and the code showed the crank sensor so I changed it and now the short term fuel supply goes completely lean at 32 and the long term goes up 32 and kills the engine. There are no negative numbers on long term. It ran perfect in the garage for 30 minutes but once I did the drive cycle test and all the monitors came on I finished the cycle and started the truck to do another cycle the fuel trim went to 32 and the engine stopped running. Any ideas what is going on?
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Friday, July 22nd, 2011 AT 11:21 PM

1 Reply

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Lean fuel condition could be caused by one of the following below:

1. Vacuum leaks
2. EGR and PCV valve.
3. Low fuel pressure.
4. Dirty fuel injectors.
5. Mass Air Flow Sensor.
6. Oxygen Sensor.
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Wednesday, October 12th, 2011 AT 3:28 AM

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