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1998 Ford Explorer fuel trim readings

Tiny
DANMAT99
  • MEMBER
  • 1998 FORD EXPLORER
  • 4.0L
  • V6
  • 2WD
  • AUTOMATIC
  • 126,000 MILES
The LTFT is reading -100% STFT also reading -100%, All four fuel trims are -100% can you tell me what the problem might be? The DTC is P0174 lean fuel mixture bank 2.
Friday, November 14th, 2014 AT 3:32 PM

1 Reply

Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Check fuel pressure with a gauge first auto parts rent them. Should be 30-45 psi with key on engine off if below then that is the problem. I f not check for a bad injector or vacuum leak.
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Friday, November 14th, 2014 AT 4:06 PM

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