does anybody know how to convert grams per mile to ppm. I am working on a vehicle that has failed emissions testing and am having trouble with these contrasting data units

 

Highrider,

I don't believe there is a conversion. Based on reading some of the statistical data from the EPA website(not recommended), the grams per mile figure is calculated measuring only a specific pollutant(CO, etc). The other components(IE total volume of exhaust) are not measured, therefore, IMO, it would be impossible to reverse engineer the PPM value. Do you at least have a "Current gm/mile" and "Target(or Max) gm/mile" value to work with?

Sorry,

YelloEscape

 

yes i have target grams/mile and current readings from a printout. from illinois emissions testing. but our gas analyzer reads in ppm. and our shop is located in iowa.

 

Highrider76,

I believe your best bet would be to poll the board for folks from states with emissions testing and ask if anyone has the target or max passing PPM value for their state. Some states must measure by PPM. South Carolina does not do emissions testing(or inspections of any kind, for that matter), so I can't help there. Then I'd take your current PPM value and work downward to the most conservative of the passing values you get from the poll. Once you can pass another states PPM testing, you should be good to go with Illinois' gm/mile testing.

Looking at Delaware, Hydrocarbon max PPM value is 40.
Colorado tests cars and light duty trucks newer than 1981 at gm/mile. Older vehicles, and all heavy duty trucks are tested at PPM. What year/type of vehicle are you testing?

Good luck!

YelloEscape

 

the make is a honda, the model accord, and year i cant think of it but its early 90's. I'm at home and all of the info is at work.