Engine Repair (A1)Câu 10 / 120
Blue smoke from the exhaust under acceleration most often indicates:
a.A rich fuel mixture
b.Coolant in the combustion chamber
c.Oil entering the combustion chamber
d.A lean misfire
Giải thích
Blue smoke indicates oil is being burned, commonly from worn rings, cylinder walls, or valve guide seals. White smoke suggests coolant, and black smoke suggests excess fuel. A leak-down or compression test helps localize the source.
Luyện miễn phí toàn bộ 120 câu hỏi — không cần đăng ký.
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- Technician A says low oil pressure only at idle on a high-mileage engine can be caused by worn bearing clearances. Technician B says a worn oil pump or diluted oil can also lower pressure. Who is correct?
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