Posted by Traveler on August 03, 03 at 12:59:23:
1995 Suburban emission testing:
At Purcahse – tested but data NA (looking)
Mods:
* New spark plugs
* Cold air intake less restrictive
* Fuel filter
* 180 thermostat
* All fluids
- - - -
1999 August
HC Actual 32.4 Limit 220 PPM
CO Actual 0.20 Limit 1.20 %
CO2 Actual 14.594 Limit NA
Then:
* Replaced Oxygen sensor
* Fuel filter
* Plugs, wires, cap, rotor
* Banks K&N tall air filter assy
- - - -
2001 June
HC Actual 9.0 Limit 220 PPM
CO Actual 0.38 Limit 1.20 %
CO2 Actual 14.606 Limit NA
Then:
* High flow water pump
* SD fan clutch
* Fuel filter
* TBI blueprint and ultrasonic injector cleaning
- - - -
2003 June
HC Actual 5.6 Limit 220 PPM
CO Actual .37 Limit 1.20 %
CO2 Actual 14.524 Limit NA
- - - -
Conclusions…
If NOx were tested, it would be better with cooling mods (opinion).
Oxygen sensor made a huge improvement.
Injector cleaning halved the HC emissions. Probably has better spray pattern for more atomization, and know flow match is 5% better bank to bank based on injector flow data. Critical on TBI because one O2 sensor drives fuel amount for both banks.
The performance modifications have resulted in improved emissions. Data is too sketchy to determine mileage benefit.
Comments?
454 high pressure TBI, 100% original exhaust, current mileage about 80K.