Ski-Doo Formula 500 1998, Shop Manual

Page: 73 / 398

Section 03 TROUBLESHOOTING
Subsection 05 (ELECTRICAL SYSTEM)
03-05-7
SYMPTOM ENGINE IS MISFIRING — ERRATIC SPARK AT SPARK PLUG.
CONDITION RIDING ON WET SNOW.
Test/Inspection 1. Verify if spark plug wires and/or spark plug cap seals are sealing out moisture.
a. Defective wires and/or seals.
Replace defective part.
2. Verify if ignition system wiring harness connectors are in good condition
and/or are sealing out moisture.
a. Loose connectors, corroded terminals or defective parts.
Clean terminals and apply silicone dielectric grease. Replace defective parts.
CONDITION NORMAL USE.
Test/Inspection 1. Verify misfiring by observing flash of stroboscopic timing light; unplug
connectors between magneto/generator and vehicle wiring harness to isolate
problem. Check condition of connectors.
a. Defective spark plug(s) and/or cable(s)/cap(s). Defective electrical system wiring
harness and/or accessories and/ignition cut-out switches. Condition of connector
terminals.
Replace defective parts and/or repair damaged wires. Replace defective
switch(es). Clean terminals and apply silicone dielectric grease.
CONDITION RIDING IN DEEP AND THICK SNOW.
Test/Inspection 1. Perform all verifications outlined under ENGINE DOES NOT START — NO
SPARK AT SPARK PLUG.
2. Verify spark plugs. Proceed with spark plug analysis in order to identify source
of problem.
a. Defective and/or worn spark plug(s) and/or cable(s) and/or cap(s).
Replace defective part(s). Proceed with ignition system testing procedures.
Perform engine analysis.