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Home >> Jeep >> 1987 >> Grand Wagoneer AW4 >> Repair and Diagnosis >> Engine Performance >> System >> 4.0L MPI System >> Operation >> Data Sensors & Switches >> Notes
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Data Sensors & Switches: Notes

Each sensor and/or switch furnishes electronic impulses to the ECM. Based on these input signals, the ECM computes spark timing and air/fuel mixture for proper engine operation.