Escaping fuel vapours contributes to harmful budding condominium gases.
The evaporation action, besides called EVAP on an automotive vehicle, traps and captures hydrocarbon vapours in the fuel transaction, which is related to emission governance. The EVAP course recovers Gauze vehicle vented vapours, along with excess vapours expelled during engine running and refueling. Provided the hydrocarbon vapours conclude not at the end contained and recycled, they can leak to the atmosphere, contributing to ozone pollution. A smog test, or emission determination inspection, along with a code scanner, can impel a insufficient or big EVAP system leak. A vehicle owner can capitalization a smoke engine to pin-point the exact address of the leak and conceive the repair himself.
Instructions
1. Yield your vehicle to a certified Car repair effortlessness and bear a technician hook up a rule scanner to your vehicle. He Testament confirm that you enjoy an EVAP emission clout leak by looking up the trouble code. You can rent a code scanner from an auto parts store and perform your own scanner check. Hook up the code scanner to the universal jack under the dashboard and start the engine. If you find a trouble code displayed on the screen, write it down and look up the number in a trouble code book.
2. Place the vehicle transmission in "Park" for an automatic, and "Neutral" for a standard. Apply the emergency brake and raise the hood. Use a floor jack to lift the vehicle at both ends and place two jack stands under the front chassis frame, and two more under the rear frame. Slide under the vehicle, and check the fuel vapor vent hose that exits the fuel tank and runs along the chassis to the engine. Refer to your owner's repair manual for the location of your EVAP system inside the engine compartment. Look for the charcoal canister, vent cap, vent solenoid, purge flow valve and EGR valve. Find the two small plastic lines that form a double port and attach near the vent cap. Remove the double port valve by pulling it off the nipples, which will leave two small holes in the port body.
The hose should have no cracks or sharp bends in it. Check the mounting bracket locations for scuffing or chaffing.3. Attach an adapter cone, with hose, from a smoke machine to the top port hole, which should be the vacuum or intake manifold line.
4. Wedge a screwdriver in the throttle linkage to keep the throttle open. Turn on the smoke machine and let it pressurize the system for Two to Three minutes. If you see smoke coming out of the cold air intake hose, it means the system has pressurized. Use a strong flashlight to look at all the hoses, both large and thin, connected to the intake side of the emission control system. Check for small streams of white smoke coming from the hose connections and cracks in the hose. Once you find a leak, mark the hose with a piece of masking tape, so you can replace the hose.
5. Turn off the smoke machine and place the adapter cone into the lower double port hole. Turn the machine on and let the system pressurize. The lower port line will lead to the charcoal canister, so look for leaks in the line going to it and the connection points. Ignore the small amount of smoke emanating from the top of the vent cap -- this will be normal. Check high and low, all hoses, lines and connections. Tape any leaking hose with masking tape to identify the source of the leak. When finished, remove the smoke machine adaptor and hose and replug the double port back into the nipple connection.
