ok im trying to help a friend out.

92 integra ls.

- failed fuel cap function, easy fix.
- new fuel evap test failed, anybody know what the causes are? i noticed that the tube going from the valve cover to the intake is cracked really bad, im gona help him replace that but what exactly does the new evap test for older cars check the leaks ? gas tank leak? fuel line leak?

hes also alittle over on the NO(ppm) im gona check his spark plugs, clean up his dizzy, would that be enough to lower the NO to passing measurements? going to warm up the car really good this time also so any thing else? higher octane gas?

as for the timing, i dont have a timing gun. but will try to lower timing very little. which way do you move the dizzy to retard timing? is it towards the firewall or the radiator?

NO(ppm) readings
15mph max 807 ave 237 meas 773
25mph max 746 ave 199 meas 813 <-- failed that and the new evap test, everything else pass easily.


HC(ppm) readings
15mph max 121 ave 31 meas 41
25mph max 96 ave 20 meas 24

CO(%) readings
15mph max 0.76 ave 0.10 meas 0.18
25mph max 0.65 ave 0.09 meas 0.16

everythings good aside from the new evap and NO, what do you guys think?

EDIT: the car has 322k miles and still runs like a champ only slight oil pan gasket leak

 

bump, anybody?

 

bump for some help