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...
For more information about using fuel trim to diagnose a lean fuel condition, read this article onFuel Trim by Wells Manufacturing(PDF file, requires Adobe Acrobat to read). DIAGNOSTIC TIPS FOR P0171 OR P0174 LEAN TROUBLE CODES A code P0171 or P0174 (or both) indicate the engine is runni...
Whether you car problems are simple or complex, our guides are here to help. With just adigital multimeterat your side, you can test and diagnose most of your car issues with our How To articles. One of the other tools that is a must have when you want to fix a car yourself is the...
A "random misfire code" (P0300) is even harder to diagnose because there can be numerous causes. A random misfire usually means the air/fuel mixture is running lean. But the cause might be anything from a hard-to-find vacuum leak to dirty injectors, low fuel pressure, a weak ignition c...