 Failed Smog Test - All Emissions High |
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 Nov 9, 2016 - 10:32 AM
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Enthusiast Joined Feb 1, '14 From Phoenix Currently Offline Reputation: 0 (0%)  |
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 |
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Nov 11, 2016 - 6:44 PM
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Enthusiast Joined Feb 1, '14 From Phoenix Currently Offline Reputation: 0 (0%) |
No one has any ideas at all??
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Nov 11, 2016 - 7:47 PM
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Enthusiast  Joined Mar 11, '06 From Way South Chicago Currently Offline Reputation: 0 (0%) |
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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Nov 12, 2016 - 9:47 AM
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 Enthusiast Joined Mar 8, '04 From Newport, RI Currently Offline Reputation: 63 (99%) |
Probably running rich.
How old is the 02 sensor ? -------------------- |
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Nov 12, 2016 - 7:22 PM
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Enthusiast Joined Feb 1, '14 From Phoenix Currently Offline Reputation: 0 (0%) |
I don't know that it's ever been replaced.
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Nov 14, 2016 - 4:43 PM
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Enthusiast Joined Dec 8, '03 From Lancaster CA Currently Offline Reputation: 6 (100%) |
your NO is really high, try using 91 gas next time. also look for vacuum leaks and exhaust leaks
-------------------- 2001 Celica GT-S Turbo
1997 Supra TT 6speed 1997 Celica 3MZ/1MZ swap 1990 Celica All-Trac |
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