What Causes the Fuel System in Cylinder Bank 1 of the New Jetta to Be Too Lean?

1 Answers
StAlivia
07/30/25 3:36am
Cylinder bank 1 fuel measurement system being too lean at idle speed can be caused by issues such as carbon buildup or fuel leaks. Below are the specific reasons for a lean fuel system: Caused by insufficient fuel injection: Check if there are any issues with the fuel pressure; carbon buildup may be excessive. Carbon buildup issue: The fuel measurement system usually indicates a mixture that is either too lean or too rich. If the mixture is too lean, it is necessary to clean the intake tract carbon deposits, throttle body, and replace the fuel filter. Mixture too rich: If the mixture is too rich, check the intake system for leaks. If there are none, then the issue lies with the fuel injectors. You can perform a fuel injector atomization test or simply clean the fuel injectors.
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