91 Si failed emissions?
09-25-2008, 07:33 AM
#1
Senior Member
Thread Starter
Join Date: Dec 2004
Location: White Plains, MD
Posts: 1,403
Likes: 0
Received 0 Likes
on
0 Posts
91 Si failed emissions?
Hey everyone,
I took ride to emissions this morning & failed. I know MD are jive like strict. My Carbon Monoxide passed state shows 1.20 PCT mine was 0.30 PCT & my Hydro Carbons failed. Reading was 439 state shows 220.
What I wanted to know is what should I have checked &/or do to be able to pass. BTW I have a B16A . Also, anyone else w/ a EF B16 in MD that passed or failed emissions.
Any suggestions would be appreciated,
Thanks
I took ride to emissions this morning & failed. I know MD are jive like strict. My Carbon Monoxide passed state shows 1.20 PCT mine was 0.30 PCT & my Hydro Carbons failed. Reading was 439 state shows 220.
What I wanted to know is what should I have checked &/or do to be able to pass. BTW I have a B16A . Also, anyone else w/ a EF B16 in MD that passed or failed emissions.
Any suggestions would be appreciated,
Thanks
09-25-2008, 09:41 AM
#2
Senior Member
Join Date: Dec 2004
Location: San Jose, CA
Posts: 355
Likes: 0
Received 0 Likes
on
0 Posts
-adjust the valves
-check timing
-clean and gap the spark plugs
-inspect air filter (replace if dirty)
-make sure the cat is hot when the test is done (i.e., driven for 15 to 20 minutes at freeway speed then test immediately)
-think about replacing the catalytic converter (they do get tired after a while; around $110 shipped to your door)
What kind of smog test does MD do?
My car is a stock 1991 Si with the original D16A6 no mods, California emissions.
Here in California, the engine is tested under load at 15MPH and 25MPH.
Last smog test (after two years and 13k miles on the cat)
HC (PPM) 134 max at 15, 108 max at 25 (measured 52 and 42)
CO (%) 0.82 at 15, 0.71 at 25 (measured 0.16 and 0.21)
NOX (PPM) 847 at 15, 786 at 25 (measured 832 and 397)
My car is fine for HC and CO. But, NOX is getting near the max at 15MPH 832 (only 397 at 25MPH; probably because cat heated up)
My previous smog test with a brand new cat.
-everything measured extremely low
HC 6 and 3
CO 0.00 and 0.00
NOX 56 and 43
Take Care,
ChrisS
-check timing
-clean and gap the spark plugs
-inspect air filter (replace if dirty)
-make sure the cat is hot when the test is done (i.e., driven for 15 to 20 minutes at freeway speed then test immediately)
-think about replacing the catalytic converter (they do get tired after a while; around $110 shipped to your door)
What kind of smog test does MD do?
My car is a stock 1991 Si with the original D16A6 no mods, California emissions.
Here in California, the engine is tested under load at 15MPH and 25MPH.
Last smog test (after two years and 13k miles on the cat)
HC (PPM) 134 max at 15, 108 max at 25 (measured 52 and 42)
CO (%) 0.82 at 15, 0.71 at 25 (measured 0.16 and 0.21)
NOX (PPM) 847 at 15, 786 at 25 (measured 832 and 397)
My car is fine for HC and CO. But, NOX is getting near the max at 15MPH 832 (only 397 at 25MPH; probably because cat heated up)
My previous smog test with a brand new cat.
-everything measured extremely low
HC 6 and 3
CO 0.00 and 0.00
NOX 56 and 43
Take Care,
ChrisS
Last edited by ChrisS; 09-25-2008 at 09:48 AM. Reason: add info