How do you lower the hydrocarbon levels for emission testing on a 1977 Chevy pickup truck?

Answer 1

you can try running on regular gas the adding rubbing alcohol yes the kind you can buy in your local grocery store at a ratio of 1:3.5. if your bad at math that's one part rubbing alcohol to every 3.5 parts gasoliene. for example if you have a 16 gallon tank you would put one gallon of rubbing alcohol along with the 15 gallons of gas . this will also slightly improve your gas mileage but you cant do it to much because the cumbustion process is to violent for an engine of that age it will harm the engine if you do it every time you fill up.

this is just a way to pass emissions testing it is not in any way intended to cheat out the gasoliene companies. use this at your own risk and discresion. i am not responsible for the harm that might be caused to your engine from the above statement.

AnswerHigh hydrocarbon emissions from a vehicle may be caused by improper ignition timing, faulty ignition, misfiring problems, vacuum leaks, worn piston rings or valves or an exhaust gas recirculation system incorrectly operating at idle. One fouled spark plug can result in extremely high hydrocarbon emissions. You truck is 29 years old and probably has high mileage. Start by replacing the spark plugs and plug wires. Replace every single vacuum line under the hood. Replace them one at a time, so as to not get confused. Clean you EGR Valve of any carbon deposits, and make sure it is functioning correctly. Pour a can of a good Fuel Injector cleaner such as Seafoam or Techron in a full tank of fuel. Leave the cheap stuff on the shelf, as is does very little good. To remove built up carbon deposits, inject it through the intake by following the directions on a can of Seafoam. Have someone check the timing on this vehicle. Check the smog pump to see if it is functioning. A compression check will verify if you have worn rings or a burnt valve. AnswerUsually that just requires a tune-up.