emissions help?
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Car: 91 Formula, 95 GT
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emissions help?
I have failed emissions 3 times. first test I failed HC and CO but passed NOX. Second test I just cleaned out the throtthe body, removed my hypercrap chip/ replaced with stocker and ran 2 bottles of dry gas and the damn HC went up. The last test I replaced O2 sensor, changed oil, distributor cap & rotor, PCV valve, checked spark plugs & wires-they looked good, and I failed all three (NOX went through the roof) HC & CO went down but not enough. I think the new O2 sensor is bad?
I do use a lot of oil but no more than usual and I have passed before. Now my exhaust smells like sh*t. Maybe Cat Converter should be repalced next. I do have to run high octane or I get ping. There is black smoke when I get on the throttle which makes me think it is running rich. My mechanic checked the timing and said it was good. How do I check for a rich condition? Where should I be looking next? EGR? How do I check that?
I do use a lot of oil but no more than usual and I have passed before. Now my exhaust smells like sh*t. Maybe Cat Converter should be repalced next. I do have to run high octane or I get ping. There is black smoke when I get on the throttle which makes me think it is running rich. My mechanic checked the timing and said it was good. How do I check for a rich condition? Where should I be looking next? EGR? How do I check that?
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Car: '90 RS
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Re: emissions help?
Originally posted by 91formulaSS
I have failed emissions 3 times. first test I failed HC and CO but passed NOX. Second test I just cleaned out the throtthe body, removed my hypercrap chip/ replaced with stocker and ran 2 bottles of dry gas and the damn HC went up. The last test I replaced O2 sensor, changed oil, distributor cap & rotor, PCV valve, checked spark plugs & wires-they looked good, and I failed all three (NOX went through the roof) HC & CO went down but not enough. I think the new O2 sensor is bad?
I do use a lot of oil but no more than usual and I have passed before. Now my exhaust smells like sh*t. Maybe Cat Converter should be repalced next. I do have to run high octane or I get ping. There is black smoke when I get on the throttle which makes me think it is running rich. My mechanic checked the timing and said it was good. How do I check for a rich condition? Where should I be looking next? EGR? How do I check that?
I have failed emissions 3 times. first test I failed HC and CO but passed NOX. Second test I just cleaned out the throtthe body, removed my hypercrap chip/ replaced with stocker and ran 2 bottles of dry gas and the damn HC went up. The last test I replaced O2 sensor, changed oil, distributor cap & rotor, PCV valve, checked spark plugs & wires-they looked good, and I failed all three (NOX went through the roof) HC & CO went down but not enough. I think the new O2 sensor is bad?
I do use a lot of oil but no more than usual and I have passed before. Now my exhaust smells like sh*t. Maybe Cat Converter should be repalced next. I do have to run high octane or I get ping. There is black smoke when I get on the throttle which makes me think it is running rich. My mechanic checked the timing and said it was good. How do I check for a rich condition? Where should I be looking next? EGR? How do I check that?
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