Engine Load Idle Stabilization Correction

When engine rpm changes at idle due to increased load, the ECU adjusts timing to stabilize idle speed. The ECU constantly monitors and calculates average engine speed. If the average speed is determined to go below a pre-programmed target rpm, the ECU will add advance to the basic spark angle to help re-establish the target idle speed.

The detonation correction strategy allows the engine to operate at optimum timing regardless of fuel octane, maximizing engine performance when high octane fuel is used. On some engines, this system only operates in a closed loop mode under load (vacuum below approximately 8 inches of mercury). Other engines operate in ignition closed loop under all engine load ranges.

Do It Yourself Car Diagnosis

Do It Yourself Car Diagnosis

Don't pay hundreds of dollars to find out what is wrong with your car. This book is dedicated to helping the do it yourself home and independent technician understand and use OBD-II technology to diagnose and repair their own vehicles.

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