T–6
TROUBLE CHECK CHART
OUTBOARD SURGES, RUNS ROUGH
OUTBOARD SURGES, RUNS ROUGH
OBSERVATION POSSIBLE CAUSE PROCEDURE
1200 RPM and above S.A.F.E. Access EMM fault codes
May be erratic or
inconsistent
Incorrect, fouled, or worn spark
plugs
Replace spark plugs
Water in fuel system
Check water separator/fuel filter, sample fuel from
fuel return manifold test port
Contaminated or poor fuel
quality
Check and replace fuel supply
Low or erratic fuel pressure
Check pressure, refer to FUEL SYSTEM on
p. 173
Air in fuel system
Check for air in fuel supply manifold, refer to
FUEL SYSTEM on p. 173 (vapor separator
venting and fuel supply)
Fuel supply restricted
Check primer bulb, anti-siphon valve, and fuel
pick-up, check for fuel system air leaks
Restricted or leaking fuel
injector(s)
Check injectors, refer to FUEL SYSTEM on p. 173
Faulty wiring, connections,
grounds, or CPS air gap
Check all grounds, connections, and wiring.
Check CPS air gap.
Low alternator output (55 V)
Check voltage on 55 V circuit, refer to SYSTEM
ANALYSIS on p. 113 and ELECTRICAL AND
IGNITION on p. 135
EMM program, timing, or
operation
Check EMM program and timing;
check injector
coefficients; and monitor injector circuits and
ignition primary outputs
Weak or erratic ignition
operation
Check ignition, refer to SYSTEM ANALYSIS on
p. 113 and ELECTRICAL AND IGNITION on
p. 135
Capacitor or 55 V circuit wiring
Check capacitor and 55 V circuit (white/red), refer
to SYSTEM ANALYSIS on p. 113 and
ELECTRICAL AND IGNITION on p. 135
Restricted engine exhaust Check and repair as needed
Propping Change propeller type or size as needed
Audible noise
Internal powerhead damage Check and repair as needed
Damaged gearcase Inspect gearcase and lubricate
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