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Home >> Jaguar >> 1990 >> XJ6 Base >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Basic Testing >> Idle Speed & Ignition Timing >> Ignition Timing (XJS)

Ignition Timing (XJS)

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ECU controls the ignition timing by monitoring intake manifold vacuum, throttle position, engine air, coolant temperature and engine speed. ECU uses information received from crankshaft sensor to monitor engine speed.