97 2.2 cav emssion fail why? - Page 2 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 12-20-2012, 09:14 PM   #11
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evap takes a while too and very rarely causes drive-ability issues
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Old 12-20-2012, 09:16 PM   #12
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well i have had it running for a while or what would be wrong with the evap?

as for the CAT light it doesnt show up as being a feature for the 97 but shows up as an option for for the 2004 cuz i know when cat is malfuntion it had flashed

i sure like old cars lol
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Old 12-20-2012, 09:17 PM   #13
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ah ok so evap doesnt matter then to pass emissions so i ordered anyways another cat i going to try tommorow and emission it as tommorow last day till the new year damn christmas lol

if it fails again what else would i look for?
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Old 12-20-2012, 09:19 PM   #14
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It sounds like the o2 sensors are doing what they are suppose to. Which also means that the cat should be fine too. You should get a code if something is wrong with the cat or sensors.
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Old 12-20-2012, 09:23 PM   #15
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I dont know what they base there reading on. If you are using a after market cat. It might not be made to be the same as a the factory one. If it fails after you replace it. That could be a problem you might wanna check into that. In that sense everything from codes and data list reading would be fine. But the tailpipe output would be different.
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Old 12-20-2012, 09:24 PM   #16
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well what i mean also this 97 doesnt have a 02 sensor heater but on the 2004 in the the hand held will show a circle HTr for the 02 sensor heater what i thinking is that the 97 computer doesnt show about CAT it doesnt light up in the tool but does for the 2004 but if something not working it flashes i was thinking thats cuz its old i cant even do a EVAP or a 02 sensor 2 dignastic its not supported it cant even read the VIN with the hand held what else can i look for also? is there a site that with the logging software i can see what it should be the ranges for each sensor?
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Old 12-20-2012, 09:24 PM   #17
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things that can make it run rich, air filter, maf not reading right, plugs/wires. check the temp through the scanner make sure thats good.

all vehicles 96 and later are going to have catalyst, evap, misfire, and a few others its law. the only things not law are heated cat, and a few things that can be manufacturer specific to meat emissions
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Old 12-20-2012, 09:25 PM   #18
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i have no idea if ater market cat i went to auto store and ordered the whole set from fromt to back and jsut bolted it all together
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Old 12-20-2012, 09:26 PM   #19
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ok ya i know it has a cat but i mean the software in the cars computer might not tell my hand held about the cat if its functioning right like on the 2004 it will say if the cat is malfunctioning or working fine
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Old 12-20-2012, 09:27 PM   #20
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More then likely it is aftermarket. Im not saying that is the problem but its an idea.
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