1986 328GTS Passes Emissions

I live in St. Louis county, Missouri and since I purchased my car, the emissions have always passed. Today I went for emissions and again passed. I wanted to share some information.

The test puts the car on the dyno and the car is driven through a "circuit" which varies RPM and tells when the car should be shifted. I am sure the test has changed through the years and on top of that the standards have been lowere1986 328GTSd.

July 3,2000
Standard 1986 328GTS 32,xxx miles
HC 2.0000 Grams/mile 0.1099 Pass
CO 30.000 Grams/mile 0.6051 Pass
NOx 3.0000 grams/mile 0.0681 Pass
CO2 none 61.1173 grams/mile


June 26, 2002
Standard 1986 328GTS 39,xxx miles
HC 0.8000 Grams/mile .3430 Pass
CO 15.000 Grams/mile 3.1196 Pass
NOx 2.0000 grams/mile 0.5104 Pass
CO2 none 353.6548 grams/mile

June 5, 2004
Standard 1986 328GTS 45,xxx miles
HC 0.8000 Grams/mile .3495 Pass
CO 15.000 Grams/mile 3.5983 Pass
NOx 2.0000 grams/mile 0.6238 Pass
CO2 none 346.4499 grams/mile

2002 and 2004 numbers are similar. The car has not gone through any tuneups or changes other than oil changes, fuel filter change and air filter change. Fuel Filter was done about two months ago. The air filter about a year ago. I plan on doing 45,xxx mile belt change and service this fall. (I have to enjoy the good weather).

Anyone have any comments/suggestions as to what they see? Too rich? Too lean? Advice other than a spark plug change? I will be checking fuel pressure and volume as well.

Thanks,

Mark
1986 328GTS