ASE H1 CNG Engines (Transit Bus) Practice Questions - ASE H1 - Compressed Natural Gas (CNG) Engines (Transit Bus) Certification Exam

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A CNG transit bus has a rough idle and a stored cylinder 4 misfire code. Compression and ignition on cylinder 4 test normal. What is the MOST likely remaining cause?

A leaking radiator cap A failed engine coolant temperature sensor A worn serpentine belt A faulty or clogged cylinder 4 gas injector delivering incorrect fuel quantity

Correct Answer:

A faulty or clogged cylinder 4 gas injector delivering incorrect fuel quantity

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