Diagnosis and Understanding of EGR (Exhaust Gas Recirculation) systems. Part 1 describes general EGR function and explanation of operation, components, and diagnosis of vacuum-solenoid controlled EGR systems.
Part 2 is HERE: [ Ссылка ]

Helpful links for more info:
MAP Sensor Diagnosis and Understanding:: [ Ссылка ]

Vacuum leak diagnosis using fuel trim: [ Ссылка ]

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