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> Failed Smog Test - All Emissions High
post Nov 9, 2016 - 10:32 AM
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blickman

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Hi. Could use some advice. 94 ST Manual rebuilt engine

Previously had CEL with code 071. Replaced ERG valve, EGR modulator, and 1 vacuum hose. CEL fixed.

Went to have car smogged and all emissions are high. Here are the numbers:

15 mph HC=95 CO=0.53 NO=795
25 mph HC=82 CO=0.41 NO=763

Not sure where to begin. Should I just replace both O2 sensors to start and then retest? Any advice appreciated.

Thanks!

Jay

post Nov 11, 2016 - 6:44 PM
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blickman

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No one has any ideas at all??
post Nov 11, 2016 - 7:47 PM
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Bitter

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Without knowing the limits and by how much you failed it's hard to say but just check that everything is in spec like ignition timing, plug gap, coil resistance, etc.


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post Nov 12, 2016 - 9:47 AM
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Batman722



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Probably running rich.
How old is the 02 sensor ?


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post Nov 12, 2016 - 7:22 PM
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blickman

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I don't know that it's ever been replaced.
post Nov 14, 2016 - 4:43 PM
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Smaay

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your NO is really high, try using 91 gas next time. also look for vacuum leaks and exhaust leaks


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2001 Celica GT-S Turbo
1997 Supra TT 6speed
1997 Celica 3MZ/1MZ swap
1990 Celica All-Trac

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