2. Ignition System Diagnostics Reading A Scope Pattern

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

6. 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

9. 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

10. Review

14. Spark Plug Under Load Test

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

21. Distributor & Rotor Problems

25. Cylinders # 2 & # 3

26. Review

29. Low Compression

31. Low Secondary Resistance