Section 03 TROUBLESHOOTING
Subsection 05 (ELECTRICAL SYSTEM)
MMR2000_116_03_05A.FM 03-05-3
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 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 plug. 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.
SYMPTOM FOULED (BLACK) SPARK PLUG TIP.
CONDITION NORMAL USE.
Test/Inspection 1. Check carburetor.
a. Carburation is too rich.
Adjust according to specifications (refer to TECHNICAL DATA 10).
2. Check engine compression.
a. Leaking piston ring(s).
Replace.
SYMPTOM SPARK PLUG TIP IS LIGHT GREY.
CONDITION NORMAL USE.
Test/Inspection 1. Refer to “Engine slows down or stops at high RPM” and check items listed.
2. Check spark plug heat range.
a. Spark plug heat range is too high.
Replace by Bombardier’s recommended spark plug
(refer to ELECTRICAL 06).
3. Check carburetor gasket.
a. Cracked or deformed gasket.
Replace.
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