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1991 Toyota Celica Code 25

Tiny
CAVIBA
  • MEMBER
  • 1991 TOYOTA CELICA
  • 2.2L
  • 4 CYL
  • FWD
  • AUTOMATIC
  • 127,500 MILES
What is the most common cause of this code? I've changed my O2 and MAP sensor, but it didn't fix the problem. The car has a hard time idling. It usually dies very easily. It tries to idle around 1200, but at times, it just falls to about 400 then dies. Sometimes its a bit sluggish, but this is rare. Is it possible that the timing was adjusted to run decently with a bad MAP sensor? I tried another one, but the car sputtered really bad.
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Wednesday, May 27th, 2015 AT 7:05 PM

1 Reply

Tiny
CARADIODOC
  • MECHANIC
  • 33,873 POSTS
Code 25 Air/fuel ratio LEAN

The two most common causes of this are a vacuum leak and a leak in the fresh air tube between the mass air flow sensor and the throttle body. When any air sneaks in that doesn't go through the mass air flow sensor, it doesn't get measured, so no fuel is commanded to go with it.
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Wednesday, May 27th, 2015 AT 7:53 PM

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