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1993 Toyota Corolla Failed Emissions - Check engine light o

Tiny
93COROLLA
  • MEMBER
  • 1993 TOYOTA COROLLA
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 245,000 MILES
I have a 93 Corolla - 1.8L. My car failed the emission test. HC read 434 and the CO% was 1.96%. The check engine light is off. What could be the problem?
Monday, August 3rd, 2009 AT 7:02 PM

6 Replies

Tiny
STEVEW84
  • MECHANIC
  • 673 POSTS
Anything done to the car recently? Any tune-up? What rpm were those numbers at? Did you let the car run long enough?
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Tuesday, August 4th, 2009 AT 7:14 AM
Tiny
93COROLLA
  • MEMBER
  • 3 POSTS
RPM = 3179

Spark plugs and distributor cap (with wires) were done last year. I also had the resonator done last year. The car was running all day. Any advice would be greatly appreciated.

Thanks.
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Tuesday, August 4th, 2009 AT 6:51 PM
Tiny
STEVEW84
  • MECHANIC
  • 673 POSTS
I'm not sure how long the rpm stayed at that, but I'm pretty sure you have a catalytic converter problem. That HC is way high for that rpm.
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Tuesday, August 4th, 2009 AT 7:49 PM
Tiny
93COROLLA
  • MEMBER
  • 3 POSTS
If the problem was the cat, why wouldn't my check engine light come on?

Thanks again.
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Tuesday, August 4th, 2009 AT 9:03 PM
Tiny
STEVEW84
  • MECHANIC
  • 673 POSTS
Its obd1 car that has no cat monitor. OBD2 came out in 96. That is why they had to run the car for emmissions. If it was a 96 and newer they would plug into the OBD2 port and check for codes and make sure the monitors are set.
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Tuesday, August 4th, 2009 AT 9:14 PM
Tiny
CORMECH
  • MEMBER
  • 4 POSTS
You might want to check to see if the O2 sensor is operating properly. You will also want to check for any exhaust leaks before the O2 sensor. Check the exhaust manifold for cracks as this would allow air into the exhaust system fooling the O2 sensor into thinking that the engine is running lean. Hope this helps.
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Wednesday, August 5th, 2009 AT 7:28 PM

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