Having difficulties passing emissions this time around. Two years ago when I bought the car completely stock it passed with flying colors. It was reading well below all of the limits. Yesterday I realized that the limits for hc, co, and no have decreased a whole lot. Just trying to get any information as to what I can do to get the car to pass.
The Numbers
At 15 mph:
Hc ppm – Failed
Limit = 55
Reading = 146
CO% - Passed
Limit = .22
Reading = .15
No ppm – Failed
Limit = 720
Reading = 1695
At 25 mph:
HC ppm – Failed
Limit = 100
Reading = 155
CO% - Passed
Limit = .32
Reading = .19
NO ppm – Failed
Limit = 700
Reading = 1283
It’s an 87 that has been converted to mass air running stock maf and 19lb injectors. 95k miles, cobra intake, shorty headers, mac catted h (about 5 years old) and bassani catback. All emissions equipment still on car. Yesterday after it failed, I ran the codes and found code 94, 44 which have to do with thermactor air injection system. I replaced the rubber hoses that hook up to the valves on the line that goes from the air pump to the h-pipe and that erased the code from the scanner. Everything passed with an 11 even the cylinder balance test. I have a feeling fixing this will not be sufficient to clean up my numbers.
I bought a set of sparkplugs which will be going on tonight. gapped at .54. Filled her up with 93 this morning. Oil was changed less than a month ago. Wires, cap, rotor are less than 6 months old. Fuel filter was changed about a year ago. I checked the vacuum... got a steady 17psi coming from the tree on the firewall. Egr valve was tested and works fine. Timing is set at 10~11*.
Unfortunately, I don’t have my stock h-pipe anymore. But by passing CO readings that means cats are fine, right? Thanks for any input.
The Numbers
At 15 mph:
Hc ppm – Failed
Limit = 55
Reading = 146
CO% - Passed
Limit = .22
Reading = .15
No ppm – Failed
Limit = 720
Reading = 1695
At 25 mph:
HC ppm – Failed
Limit = 100
Reading = 155
CO% - Passed
Limit = .32
Reading = .19
NO ppm – Failed
Limit = 700
Reading = 1283
It’s an 87 that has been converted to mass air running stock maf and 19lb injectors. 95k miles, cobra intake, shorty headers, mac catted h (about 5 years old) and bassani catback. All emissions equipment still on car. Yesterday after it failed, I ran the codes and found code 94, 44 which have to do with thermactor air injection system. I replaced the rubber hoses that hook up to the valves on the line that goes from the air pump to the h-pipe and that erased the code from the scanner. Everything passed with an 11 even the cylinder balance test. I have a feeling fixing this will not be sufficient to clean up my numbers.
I bought a set of sparkplugs which will be going on tonight. gapped at .54. Filled her up with 93 this morning. Oil was changed less than a month ago. Wires, cap, rotor are less than 6 months old. Fuel filter was changed about a year ago. I checked the vacuum... got a steady 17psi coming from the tree on the firewall. Egr valve was tested and works fine. Timing is set at 10~11*.
Unfortunately, I don’t have my stock h-pipe anymore. But by passing CO readings that means cats are fine, right? Thanks for any input.