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    Automotive Technology Study Set 1
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    Exam 34: Emission Control Diagnosis and Service
  5. Question
    Excessively High HC Emissions May Be Caused by ______
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Excessively High HC Emissions May Be Caused by ______

Question 9

Question 9

Multiple Choice

Excessively high HC emissions may be caused by ______.


A) ignition system misfiring
B) an improper ignition timing
C) a lean air/fuel ratio
D) both A and B

Correct Answer:

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