A technician repaired a cold-start and hard-starting problem by replacing the secondary ignition wires and spark plugs. After the repair, the vehicle failed an emission test for high CO and HC levels. Technician A says a restriction in the fuel delivery system such as the fuel filter could be the problem. Technician B says that the engine oil could be contaminated with fuel. Who is correct?
A) A only
B) B only
C) both A and B
D) neither A nor B

Question

Quizplus · Accepted Answer

Contaminated engine oil with fuel can cause high CO and HC levels due to incomplete combustion, while a restriction in the fuel delivery system would more likely cause lean conditions, not high emissions.

A Technician Repaired a Cold-Start and Hard-Starting Problem by Replacing