Question about 1991 Toyota Cressida
FAILED SMOG TEST HIGH CO AND HC
Posted by Anonymous on
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Posted on Jan 02, 2017
SOURCE: high hc
you may need replace the catalytic converter, but 1st do this, clean the throttle body and idle airbypass valve, change the oil before the retest as well, get it as hot as you can before the test, hold it at a high idle prior to the test, this may squeak you by, as a 20 year smog tech these are the thing I did, if all else fails do the cat conv.
Posted on Oct 15, 2008
have you had the the engine codes pulled and reset?
and if so what are your engine codes?
i dont know of any car that will pass emissions test with the engine light on.
we cure your trouble that caused your engine light to come on and you will pass your test.
Posted on Nov 24, 2008
running too rich, probable causes spark plugs, pcv valve malfunction, leaking injectors, vacuum leak, catalytic convertor, o2 sensor,
Posted on May 12, 2010
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