What are the symptoms of a bad fuel injector?
Symptoms could range from almost none, to a rough idle, to a misfire while driving, depending on the severity of the problem. On most post 1996 model vehicles, a check engine light will pick up moderate to severe failures. Diagnostic trouble codes (DTC) could range from a misfire, excessively rich or lean condition and even as an oxygen sensor out of range. Professional technicians often use a combination of fuel trim readings, lab scope patterns, fuel pressure drop test and cylinder balance test to check for bad injectors.
Symptoms could range from almost none, to a rough idle, to a misfire while driving, depending on the severity of the problem. On most post 1996 model vehicles, a check engine light will pick up moderate to severe failures. Diagnostic trouble codes (DTC) could range from a misfire, excessively rich or lean condition and even as an oxygen sensor out of range. Professional technicians often use a combination of fuel trim readings, lab scope patterns, fuel pressure drop test and cylinder balance test to check for bad injectors. Please see our Detailed Topic Fuel Injection and Wallet Flushing for more information..
