Folks,
I spent a fair amount of time discussing my emissions inspection failures here two years ago. Here we go again. This is the Northern Virginia metro area.
Here are the numbers:
HC 87 limit, 06 reading, 84 limit, 09 reading ....... GOOD!
CO .48 limit, .04 reading, .47 limit, .03 reading ...... GOOD!
NOx 655 limit, 1101 reading, 594 limit, 1005 reading ...... BAD!
The first numbers are for 15mph (1319 rpm), 2nd gear I think
The second numbers are for 25mph (1316 rpm), 3rd gear I think
I had done nothing special prior to the test. Oil is clean and car runs perfect. There is nothing wrong that I know of. The weather was cool (60 degrees) and I left the cooling fan running all during the test (to try to limit combustion temps).
I suspect the problem is with my after market exhaust system where my two new (2 years ago) 3-way Catco cats are sitting about a foot or more further back in the downtubes than stock. I suspect they just don't stay hot enough to do the job. I really struggled to pass last time when the cats were brand new. I'm scheduled now for a VA DEQ certified diagnostic session. I doubt they will find anything wrong. Then, I'm angling for an exemption. This car does NOT have an EGR system so that presents a problem right away for the cats to struggle by.
Can anyone suggest a better course of action. This is getting to be a royal PIA!!
Thanks.
Jon
I spent a fair amount of time discussing my emissions inspection failures here two years ago. Here we go again. This is the Northern Virginia metro area.
Here are the numbers:
HC 87 limit, 06 reading, 84 limit, 09 reading ....... GOOD!
CO .48 limit, .04 reading, .47 limit, .03 reading ...... GOOD!
NOx 655 limit, 1101 reading, 594 limit, 1005 reading ...... BAD!
The first numbers are for 15mph (1319 rpm), 2nd gear I think
The second numbers are for 25mph (1316 rpm), 3rd gear I think
I had done nothing special prior to the test. Oil is clean and car runs perfect. There is nothing wrong that I know of. The weather was cool (60 degrees) and I left the cooling fan running all during the test (to try to limit combustion temps).
I suspect the problem is with my after market exhaust system where my two new (2 years ago) 3-way Catco cats are sitting about a foot or more further back in the downtubes than stock. I suspect they just don't stay hot enough to do the job. I really struggled to pass last time when the cats were brand new. I'm scheduled now for a VA DEQ certified diagnostic session. I doubt they will find anything wrong. Then, I'm angling for an exemption. This car does NOT have an EGR system so that presents a problem right away for the cats to struggle by.
Can anyone suggest a better course of action. This is getting to be a royal PIA!!
Thanks.
Jon