 Failed Smog Test - All Emissions High |
 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 - 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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Posts in this topic
blickman Failed Smog Test - All Emissions High Nov 9, 2016 - 10:32 AM
blickman No one has any ideas at all?? Nov 11, 2016 - 6:44 PM Batman722 Probably running rich.
How old is the 02 sensor ? Nov 12, 2016 - 9:47 AM blickman I don't know that it's ever been replaced. Nov 12, 2016 - 7:22 PM
Smaay your NO is really high, try using 91 gas next time... Nov 14, 2016 - 4:43 PM |
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