On VW engines with dual injection (port + direct), under what operating conditions does the ECM primarily use port injection?
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A
Cold start and low-load operation to clean intake valves and prevent carbon deposits
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B
High-load and high-RPM conditions where direct injection cooling effect is insufficient
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C
Only during warm-up phase until coolant reaches operating temperature
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D
Exclusively during deceleration fuel cut-off to purge port injector circuits