I have a 1993 Toyota corolla DX automatic trans and a 1.8 engine. We are just about to 210,000 miles. I failed NJ emissions. A year or two ago i failed inspection and replaced the cap, rotor, wires, and put in platinum plugs. Which didn't help, then i replaced the catalytic converter and she passed. There was a pin hole leak through the center of the material inside the cat when i replaced it, but that cat had 150-170,000 miles on it. She burns or pushes some oil. About a quart every 1000 miles. I do all highway high RPM driving so i expect some oil pushes out the valve cover gasket and some gets burned. Check out the 1st emissions test...
HC ppm 570/220 fail
CO% .62/1.20 pass
HC ppm 587/220 fail
CO% .68/1.20 pass
other readings about the same.
I was going to replace the O2 sensor just fun. But the parts store gave me the wrong one. So after reading some posts about passing emissions. I had a half tank of gas about 5 gallons which i added one bottle of dry gas with iso-alcohol. did a test drive to get some into the engine. Next day i added another bottle of dry gas and went to inspection. Here are the results...
HC ppm 506/220 fail *****no real change******
CO2% .77/1.20 pass
HC ppm 256/220 fail ****** so close*****
CO% .56/1.20 pass
I'm going to pull a spark plug to check it and check the air filter. Someone posted that the air filter change made their car pass. I've been looking at new cars all week and i just keep coming back to my corolla. Nothing really makes me say that's the car i want. Versus a 1993 model that gets great gas mileage and starts every time with no let downs. Not really feeling like putting a new engine into this car. All help is appreciated.