Evinrude E-tec 75 HP Service Manual page 331

OUTBOARD HARD TO START
OBSERVATION
Outboard eventually
starts, may or may not
run properly once
started
POSSIBLE CAUSE
Weak battery
Battery cables and connections
Starter or bendix/drive gears
Water in fuel system
Contaminated or poor fuel
quality
Air in fuel system
Incorrect, fouled, or worn spark
plugs
Low fuel pressure
Fuel supply restricted
Low or no alternator output
(55 V)
Capacitor or 55 V circuit wiring
Restricted or leaking fuel
injector(s)
Weak or erratic ignition
operation
Crankshaft Position Sensor
(CPS)
Excessive fuel or oil, engine
flooding
EMM program, timing, or
operation
Internal powerhead damage
Low compression
Leaking cylinder/crankcase,
intake manifold, or reed valves
TROUBLE CHECK CHART
OUTBOARD HARD TO START
PROCEDURE
Check battery, recharge or replace
Clean and tighten connections, check voltage
drop on high amperage circuit
Check starter, inspect bendix/drive gears
Check water separator/fuel filter, sample fuel from
fuel return manifold test port
Check or replace fuel supply
Check for air in fuel supply manifold, refer to
FUEL SYSTEM on p. 155 (vapor separator
venting and fuel supply)
Replace spark plugs
Check pressure, refer to FUEL SYSTEM on
p. 155
Check primer bulb, anti-siphon valve, and fuel
pick-up, check for fuel system air leaks
Check voltage on 55 V circuit, refer to SYSTEM
ANALYSIS on p. 103 and ELECTRICAL AND
IGNITION on p. 123
Check capacitor and 55 V circuit (white/red), refer
to SYSTEM ANALYSIS on p. 103 and
ELECTRICAL AND IGNITION on p. 123
Check injectors, refer to FUEL SYSTEM on p. 155
Check ignition, refer to SYSTEM ANALYSIS on
p. 103 and ELECTRICAL AND IGNITION on
p. 123
Check CPS air gap and EMM LED indicators
Check for leaking injectors, leaking fuel or oil lift
pump, or leaking vapor separator vent. Refer to
SYSTEM ANALYSIS on p. 103.
Check EMM program and timing; check injector
coefficients; and monitor injector circuits and
ignition primary outputs
Check and repair as needed
Check compression
Check and repair as needed
T–3