1994 Toyota Tercel HC levels

1994 TOYOTA TERCEL
201,000 MILES • 4 CYL • 2WD • MANUAL
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SCOTT ANTHONY HOOVER
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  • 1 POST
My car failed smog with HC levels of 156 with a maximum of 99 at 25 mph and I was told to replace catalytic converter and clean EGR passages. I passed all other portions of the test and was wondering if this diagnosis was correct.
Feb 13, 2009 at 8:43 AM
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RASMATAZ
  • ✓Experienced Mechanic
  • 75,988 POSTS
High (HC) emissions usually indicate ignition misfire due to fouled spark plugs or a bad plug. But high HC emissions can also be caused by burned exhaust valves (check compression), lean misfire (check for vacuum leaks, low fuel pressure or dirty injectors), or rich fuel conditions (fuel saturated carburetor floats, excessive fuel pressure, leaky injectors or a dead O2 sensor).
Feb 13, 2009 at 8:48 AM
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