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Ignition System Diagnostics

DESCRIPTION

This guide explores ignition system diagnostics, focusing on scope patterns, firing orders, and variations that may indicate engine issues. Learn about the voltage necessary for spark plug activation, duration specifics, and coil condition through secondary patterns. Discover how to identify normal and abnormal firing patterns, including signs of low cylinder pressure or secondary resistance issues. Understanding these concepts is crucial for effective troubleshooting and maintaining optimal engine performance.

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Ignition System Diagnostics

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Presentation Transcript

  1. Ignition System Diagnostics Reading A Scope Pattern

  2. The Scope

  3. FIRING ORDER

  4. FIRING ORDER • Some older scopes read # 1 cylinder to the far right

  5. Secondary Patterns • Most often used • Are read in Parade or Raster • Display actual voltage needed to fire each spark plug • Duration of each spark • Coil condition • Secondary circuit resistance

  6. Secondary Pattern

  7. NORMAL PATTERNS

  8. NORMAL PATTERNS • FIRING LINES HAVE 7 THOUSAND TO 10 THOUSAND VOLT RANGE • NO MORE THAN 3,000 VOLT DIFFERENCE BETWEEN CYLINDERS • KV IS AN ABBREVIATION FOR THOUSAND VOLTS

  9. Review

  10. A B

  11. Spark Plug Under Load Test

  12. Abnormal Increase

  13. ABNORMAL PATTERNS

  14. Can Be Caused By • Spark Plugs • Coil • Cap/Rotor • Fuel Air Mixture • Timing • Compression

  15. Causes of Abnormal Patterns

  16. Low Cylinder Pressure

  17. Open Secondary Circuit

  18. Distributor & Rotor Problems

  19. Low Secondary Resistance

  20. Raster Pattern

  21. Problems ?

  22. Cylinders # 2 & # 3

  23. Review

  24. Low Compression

  25. Low Compression

  26. Low Secondary Resistance

  27. Low Secondary Resistance

  28. Defective Coil

  29. Incorrect Air Fuel Mixture

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