NB25 - Hard to Start: Check For Spark During Crank

- Using a neon Bulb Spark Tester (OTC D89P-6666-A) or Air Gap Spark Tester (D81P-6666-A), check for spark at all spark plug wires while cranking.

- Was spark present on ALL spark plug wires and consistent (one spark per crankshaft revolution)?

Yes -- Go to NB26. NB26 - Hard to Start: Check DPI Circuit For Short to Ground

No -- Service or replace damaged spark plug. Rerun quick test. Quick Test Appendix (Detailed Testing Instructions)