Chevrolet Astro engine running rich due to fuel leak in intake manifold on Chevrolet Astro

Some Chevrolet Astro owners report experiencing issues related to a rich running engine caused by a fuel leak inside the intake manifold. This condition results in a rich air-fuel mixture, where too much fuel and too little air are injected, leading to high fuel consumption and potential damage to expensive components like the catalytic converter. Possible causes of this rich mixture include a faulty O2 sensor, dirty MAF sensor, leaking fuel injector, or vacuum leaks. Symptoms of a rich fuel condition may manifest as exhaust fumes smelling like raw gas, smooth idling, and no hesitation, often without triggering a check engine light. The presence of a P0172 code indicates a rich fuel condition, which can decrease fuel efficiency and increase emissions. It is essential for owners to diagnose the root cause of the issue, which could involve various components such as injectors or the vehicle's computer, to prevent further damage and ensure optimal performance of the Chevrolet Astro.