Question about 1997 Toyota Tacoma
Tacoma 3.4 v6, 250,000 miles. last smog 2 years ago barely passed the low idle HC, this year it failed the low and barely passed the 25mph test? I can attach actual readinsif that will help?
Hydrocarbons (HCs) are unburned fuel. You may need to replace sparkplugs and wires, if this has been done or doesn't fix the problem you catalytic converter may be worn out.
Posted on Apr 17, 2014
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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
NOX is produced when cylinder temperatures exceed 2500 deg. The systems in place to reduce NOX are EGR and the catalytic converter.
If the number is only slightly higher than avg then I would suggest the EGR, make sure that any vacuum lines are attached and that the diaphragm moves freely, be sure not to damage the rubber inside the EGR.
Retake smog test, if numbers still out of range replace the cat.
Posted on Jan 12, 2010
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