shows effects of air leak into intake. Basic injection remains at 3.0 ms because none of the inputs effecting basic injection duration have changed.

• Extra air causes engine to run lean, causing oxygen sensor to go lean.

• Short FT tries to correct but reaches +20% limit without bringing oxygen sensor back to normal switching.

• ECM learns that it will need to increase basic injection duration so that oxygen sensor can return to normal operating range.

Do It Yourself Car Diagnosis

Do It Yourself Car Diagnosis

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