Okay, just replaced plugs, cap, rotor, wires, o2 sensor, fresh cleaned K%26amp;N air filter, fuel filter, PCV valve, used tank full of injector cleaner, then eight gallons of 93 octane fuel with entire can of super octane booster, only ever use 93 octane, complete oil change... emissions test showed: @2400est rpm CO @ .18 allowed 1-- HC @ 800+ allowed 150 -- .... @510 rpm (idle) co @ .0 allowed 1.2-- HC @ 440 allowed 220. Replaced catalytic converter 2 years ago, original owner had removed. I need help and advice please.How to lower hydrocarbon emissions, had fresh tune-up o2sensor only ever 93oct fuel plus oct booster?
Just don't worry about it, mine leaks about 3 gallons every 30 minutes.
And re-remove the cat converter all it does is lower horsepowerHow to lower hydrocarbon emissions, had fresh tune-up o2sensor only ever 93oct fuel plus oct booster?
It would help if you had given the model. Some cars like Nissan and Mazda automatically will fail because they require special test procedures. You have unburnt gas. The low CO says it is raw fuel and not lack of air. The cat only cleans smog not gas. If you had a carburetter engine, I would say it was time for a rebuild of the carb. Being fuel injected, I would have said bad O2 sensor, but you replaced it. Maybe a bad injector. 93 burns slower (dirtier) than 87 octane. Booster is made not to burn. Both helps to make power, but hurt the test. Also turn up your idle, 510 is way too low for emissions testing and you're allowed to go up to 1250. The only true answer is an engine diagnostics which would tell if you have a fuel rich cylinder or if the computer is off.
How to cheat. Most states allow a free retest. Run the tank low (less than 3 gallons). Put 3 gallons of E-85 in. Run for an hour. The car will smell like butter popcorn, but will pass fine. If you can't get E-85, use a gallon of Home Depot paint thinner %26quot;Klean-Strip Denatured Alcohol%26quot; (on the side it will say, ethyl-methanol for alcohol stoves not for marine use). Remove air filter for the test, less air blockage (they don't check for it) and the couple of minutes for the test wont hurt. Top back up with regular gas after the test.How to lower hydrocarbon emissions, had fresh tune-up o2sensor only ever 93oct fuel plus oct booster?
Look people the higher octane is one of the probs with high HCs.
The higher the octane, the slower the burn rate on the fuel is. You ONLY use the min octane to prevent detonation. Low compression stock engines does not need any more than 87 octane.
High HCs is just un burnt fuel in the exhaust system
This can be from wrong octane, mis fire in the ign. system from fouled spark plugs or a bad plug, weak coil, etc , fuel pressure probs, burned exhaust valves, vac leak, stuck open EGR valve, etc
