my car did not pass the smogg... the hc was too high what could be the problem...
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1990 Toyota Tercel Question: car did not pass smogg
Answer #1rdude135 March 28, 2009, 20:11Journeyman
There could be a number of things that cause high HC. In most cases HC is related to some type of ignition issue, but could also be related to timing, and also a worn engine. A catalyst that's marginal sometimes won't clean up the exhaust enough and can cause high HC. It's best to have a qualified technician take a look at the problem for a correct diagnosis. There are so many issues that could cause high HC it's best to have someone take a look at variables to narrow it down for you.