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Ignition System Diagnostics

Ignition System Diagnostics. Reading A Scope Pattern. The Scope. FIRING ORDER. FIRING ORDER. Some older scopes read # 1 cylinder to the far right. Secondary Patterns. Most often used Are read in Parade or Raster Display actual voltage needed to fire each spark plug Duration of each spark

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Ignition System Diagnostics

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  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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