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Q:

car did not pass smogg on 1990 Toyota Tercel

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
my car did not pass the smogg... the hc was too high what could be the problem...
(1) Answer
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.