19 Ways to Diagnose Car Engine Problems - Shade Tree M.D. (Master Of Diagnostics)
|
The oxygen sensor is key for fuel economy and emissions. If your Pontiac is running rich, check the sensor output with a digital voltmeter or scan tool. It should bounce between 0.100 and 0.900 volt. If it's fixed below 0.500 volt and the engine is rich, the sensor is faulty. View Related Article
|
|