![]() ![]() The P0455 code indicates that there is a large leak in the EVAP system, but this is somewhat misleading. P0455 Diagnostic Theory for Shops and Technicians The purging process occurs when the vehicle is under acceleration, which is when most vehicles require additional fuel. These values should indicate that fuel is being added to the system and that the overall mixture is getting richer. The EVAP system's operational performance is also tracked by the Powertrain Computer by reading the change in the oxygen sensor voltages and short term fuel trim whenever the stored vapors are released or "purged" back into the combustion process. There are many ways to "leak test" the EVAP system, but most perform the leak test when the vehicle is sitting (like over night) or during the initial start-up after the vehicle has been sitting over night. This is an important task because at least 20 percent of vehicle-produced air pollution originates from malfunctioning Vehicle Fuel Storage systems. The EVAP system is designed not only to capture, store, and purge any raw fuel vapors that leak from areas in the Fuel Storage system, but also to run a series of self-tests that confirm or deny the operational and vapor holding ability of the system. Under precise operating conditions-dictated by engine temperature, speed, and load-the EVAP system stores and purges these captured fuel vapors back into the combustion process. the fuel tank, filler neck, and fuel cap). The evaporative control (EVAP) system captures any raw fuel evaporating from the fuel storage system (e.g. HCs (Hydrocarbons): Unburned droplets of raw fuel that smell, affect breathing, and contribute to smog.Defective Evaporative Vent Valve and/or Evaporative Purge Valve.Defective Fuel Tank Sending Unit gasket or seal.Torn or punctured Evaporative system hose(s).Distorted or damaged Fuel Tank Filler Neck.In some cases, there may be a noticeable fuel odor caused by the release of fuel vaporsĬommon Problems That Trigger the P0455 Code.In most cases, there are no adverse conditions noticed by the driver.Evaporative System Malfunction, Gross Leak.A reputable mechanic can solve your problem. Of course there are many possible reasons why the service engine light may come on including problems with the car's emissions. After replacing it, the fans worked as they should, my car runs cooler and the engine service engine light is now out. They were able to determine that the 25 amp fuse for the fans located under the hood was blown. I had changed out the sensors and was never able to get the light to go out or get the fans working. I knew my car's radiator fans failed to run when car's engine was hot except when the A/C was running. The mechanic was able to figure out the reason why my service engine light was staying on. Just today, I had a diagnostic check done on mine for nearly $45.00. This should pull up a code number in your car's computer and help point the mechanic and you in the direction of the malfunctioning part/s. You will need to have a reputable mechanic do a diagnostic check on the car to determine the problem. SOURCE: 2003 Buick Century Custom and the Service Engine Soon Light
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |