I took my car to the smog today and it failed and said its gross polluter. Result Are

15 mph
%CO2 | %O2 | HC(PPM) | CO(%) | NO(PPM)
MEA | MEA | Max GP MEA | MAX GP MEA | MAX GP MEA
12.3 | 0.3 | 134 308 158 | 0.82 2.32 4.22| 847 2070 586

25 mph
%CO2 | %O2 | HC(PPM) | CO(%) | NO(PPM)
MEA | MEA | Max GP MEA| MAX GP MEA | MAX GP MEA
14.2 | 0.2 | 108 258 85 | 0.71 2.21 1.37 | 786 1870 362

My car is 1990 civic ex with ZC SOHC from HMO. Installed bout a year ago. It has 2.25 inch from cat back with a cherry bomb exhaust. Any one that could help plz.

 

When did it last pass smog check?
What's changed since then?
When did you last tune it up?
Any codes?
http://www.aa1car.com/library/2000/ic60032.htm

 

It passed the smog last year in Jan. Nothing has been changed everything is still stock. I dont really know when was the last tune up because i just bought the car on the 14th of february. The guy i bought it from said the it passed smog real easy and quik. no codes at all.

 

For one thing, see Honda TSBs 93-009 and 92-041 (concerning c. 1990 Civics that fail state emissions testing). You can get them from http://search.ebscohost.com/. Your library should give you free access to ebscohost.

I am battling to get my 91 Civic to pass now. Start adding Chevron Techron (1 bottle per tank of gas). Search the archives for many more tips, including tuneup, oil change, retarding the timing, looking for an exhaust leak at the downpipe gasket right after the O2 sensor, and using other additives (that are riskier AFAIC than Chevron Techron).

 

Do it under the table....

 

If i change the cat to a new one would it change co level of my car. wut about changing the air fuel mixture screw.