1993 Toyota Celica Check Engine Light

1993 TOYOTA CELICA
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KGOPEL
  • MEMBER
  • 13 POSTS
The check engine light is on, but goes off when I accellerate. Could this be the intake sensor? I replaced my factory intake to a Mass AirFlow intake. I also Tried replacing the Oxygen Sensor, but no luck. still on. Any ideas???
Apr 2, 2006 at 8:36 AM
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LOSONE
  • ✓Experienced Mechanic
  • 1,616 POSTS
Go to the Zone and let them give you a read out of the codes. It sounds like a vacuum leak or the fuel cap gasket may be bad.
Apr 2, 2006 at 11:22 AM
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KGOPEL
  • MEMBER
  • 13 POSTS
Autozone doesn't have the older diagnostic reader. I think it might be the air temperature sensor. Had to unplug it to install the intake. Not sure though. I just don't understand why it goes off when I hit the gas.
Apr 4, 2006 at 4:02 PM
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VI3T1UV
  • MEMBER
  • 4 POSTS
Get a Hayne or Chilton manual, it should tell you how to jump wire for self-diagnostic and look up the code in the book. Hope this help!
Apr 6, 2006 at 9:31 AM
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Suggested Repair

Retrieve the trouble codes, using a Haynes or Chilton self-diagnostic jumper procedure if a parts-store scanner will not read this older system. Check for a vacuum leak and a bad fuel-cap gasket, and verify the intake air temperature sensor connection after the intake swap.

Conversation Summary

The owner of a 1993 Toyota Celica with 150,000 miles reports the check engine light is on but goes out when accelerating. A mass airflow intake was installed and the oxygen sensor was replaced without fixing it. Advice was to read the codes, check for a vacuum leak or a bad fuel-cap gasket, and use a manual to jump the self-diagnostic connector if a shop cannot scan the older system. The owner also suspected the air temperature sensor unplugged during the intake install.

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