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CHAPTER 20 OBJECTIVES Describe the procedure used to check for spark. Discuss what to inspect and look for during a v

2. . . Checking For SparkIf the engine is equipped with a separate ignition coil, remove the coil wire from the center of the distributor cap, install a spark tester, and crank the engine.A good coil and ignition system should produce a blue spark at the spark tester.. 3. . . Checking For Spark (continued)Typical causes of a no-spark (intermittent spark) condition include the following:Weak ignition coilLow or no voltage to the primary (positive) side of the coilHigh resistance or open coi1144

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CHAPTER 20 OBJECTIVES Describe the procedure used to check for spark. Discuss what to inspect and look for during a v

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    1. 1 CHAPTER 20 OBJECTIVES Describe the procedure used to check for spark. Discuss what to inspect and look for during a visual inspection of the ignition system. List the steps necessary to check and/or adjust ignition timing on engines equipped with a distributor. Describe how to test the ignition system using an oscilloscope.

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    50. 50 REVIEW QUESTIONS Why should a spark tester be used to check for spark rather than a standard spark plug?

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    52. 52 REVIEW QUESTIONS What harm can occur if the engine is cranked or run with an open (defective) spark plug wire?

    53. 53 REVIEW QUESTIONS What are the sections of a secondary ignition scope pattern?

    54. 54 REVIEW QUESTIONS What can the slope of the spark line indicate about the engine?

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