Step 3 » GENERAL learning environment Category C (C, C1)

GENERAL Learning Environment Category C (C, C1)
Question 368 of 533

The misfires in the intake and exhaust manifolds occur due to:

A the cold engine;
B the clearance that is too small between rocker arms and valves;
C the engine that is too hot.

Explanation

Explanation text category C / driving tests drpciv:
When the thermal clearance (between rocker arms and valves) is too small or nonexistent, the valves do not close completely and gas leaks appear, which lead to misfires (in intake or at the exhaust). Therefore in the intake and exhaust manifolds, the misfires occur as a result of the clearance that is too small between rocker arms and valves.
Correct answer: B
 
Driving tests drpciv category C explained.

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