Get the vehicle to autozone and get it scanned for codes and comeback with it-this it the starting point for diagnosis.
Gas cap! Sounds like there's a problem with the evaporative system could be a purging solenoid/charcoal canister
OBD II also monitors the evaporative emissions (EVAP) system, but only once during a drive cycle. The purpose here is to detect leaks that allow fuel vapors to escape into the atmosphere. OBD II does this by applying vacuum or pressure to the fuel tank, vapor lines and charcoal canister. If OBD II detects no air flow when the EVAP canister purge valve is opened, or it detects a leakage rate that is greater than that which would pass through a hole 0.040 inches in diameter (0.020 inches for 2000 and up model year vehicles, which is the size of a pin prick), the EVAP system is malfunctioning and OBD II sets a code.
If you have a P0440 code indicating a fault in the EVAP system, finding the leak can be a challenge. The first place to start is the gas cap. A loose-fitting or damaged cap can allow enough air leakage to set a code. To find a vapor leak, you may need a leak detector that uses smoke and/or dye.
Tuesday, October 30th, 2007 AT 12:27 AM