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1991 Toyota Tercel 1991 Tercel Won't Pass Smog

Tiny
WSTENZEL
  • MEMBER
  • 1991 TOYOTA TERCEL
Engine Performance problem
1991 Toyota Tercel 4 cyl Automatic 135000 miles

Hi,
I have a 1991 Toyota Tercel that will not pass California smog.
At first there was a problem only with the exhaust section- there is 3 sections that the car has to pass inspection in.
Then my mechanic repaired the exhaust pipe and now
it is not passing in the other 2 sections- fuel mixture and unburned fuel I think, but not sure.
We replaced the oxygen sensor and it is still running with the mixture off. Before I spend anymore money, I'm hoping someone has an idea what the problem is
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Thursday, September 17th, 2009 AT 2:03 PM

3 Replies

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
What failed the test? HC/CO/CO2/NOX/O2?
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Thursday, September 17th, 2009 AT 2:11 PM
Tiny
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HC and CO failed, by the way mechanic says the EGR is working.
It was failing in the NOX but the exhaust repair fixed that and made the other sections fail.
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Thursday, September 17th, 2009 AT 2:29 PM
Tiny
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The EGR valve if it shuts closed will raise the oxides of nitrogen.

HC and CO High levels I recommend you have the catalytic converter and air injection system checked out-
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Thursday, September 17th, 2009 AT 2:35 PM

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