my 94 SC 5spd failed CA smog check for fourth time...1st time results:15mph HC max 81 measured 138, CO max 0.47 measured 0.52, NO max 685 measured 1158. 25mph HC max 47 meas 129, CO max 0.44 meas 0.51, NO max 696 meas 1056. I went in without doing anything to the car.
2nd time: I changed new spark plugs and wires and O2 sensors. Results:
15mph HC max 81 meas 158, CO max0.47 meas 0.50, NO max 685 meas 1134,
25mph HC max 47 meas 155, CO max0.44 meas 0.50, NO max 696 meas 1137.
It actually got worse....go figure!
3rd time: I took the octane plugs and put 101 octane gas in the tank($6 a gallon) 15mph HC meas 99(fail), CO meas 0.46(pass), NO meas 412(pass),
25mph HC meas 39(pass), CO meas 0.49(fail), NO meas 378(pass).
NO went down a LOT and passed, CO in the borderline, HC still too high at 15mph. Almost did it! Hooked up the tester and got codes: 118 engine coolant temp sensor, 113 air charge temp sensor, 126 BAP sensor. Changed all three. No other codes. Car runs perfect.
4th time today: I did add gas line antifreeze in the tank with 101 octane and took the octaneplugs out. HC and CO failed again. Frustrated...help?
2nd time: I changed new spark plugs and wires and O2 sensors. Results:
15mph HC max 81 meas 158, CO max0.47 meas 0.50, NO max 685 meas 1134,
25mph HC max 47 meas 155, CO max0.44 meas 0.50, NO max 696 meas 1137.
It actually got worse....go figure!
3rd time: I took the octane plugs and put 101 octane gas in the tank($6 a gallon) 15mph HC meas 99(fail), CO meas 0.46(pass), NO meas 412(pass),
25mph HC meas 39(pass), CO meas 0.49(fail), NO meas 378(pass).
NO went down a LOT and passed, CO in the borderline, HC still too high at 15mph. Almost did it! Hooked up the tester and got codes: 118 engine coolant temp sensor, 113 air charge temp sensor, 126 BAP sensor. Changed all three. No other codes. Car runs perfect.
4th time today: I did add gas line antifreeze in the tank with 101 octane and took the octaneplugs out. HC and CO failed again. Frustrated...help?