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What Causes Honda's Smart Fuel Injection System Malfunction?

1 Answers

OAaron

09/02/25 7:08am

Honda's smart fuel injection system malfunction is likely due to a failure in the engine's fuel trim. The cause of this issue could be a faulty fuel injector. More details are as follows: Symptoms of the malfunction: Fuel trim refers to the electronic control unit (ECU) adjusting the fuel delivery by increasing or decreasing the injector opening time to achieve the optimal air-fuel ratio (14.7:1 air to fuel mass ratio). A rich air-fuel ratio indicates excessive fuel delivery, while a lean air-fuel ratio indicates insufficient fuel delivery. Possible causes: These include air leaks downstream of the mass air flow (MAF) sensor, PCV system leaks, exhaust leaks near or before the oxygen sensor, clogged fuel injectors or other fuel system issues, EGR system leaks, and a contaminated MAF sensor (causing the ECM to underestimate air flow).

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