Outboard motor troubleshooting
4-28
Symptom 1: Unstable engine idle speed, poor acceleration, poor performance, or limited engine
speed.
Compression pres-
sure is low
Improper valve timing
Check the valve timing. 7-43
Check the timing belt. 7-43
Check the cam chain. 7-49
Check the chain tensioner. 7-49
Check the VCT for sticking. 7-48
Compression leakage
Check the valve for bends and
sticking.
7-61
Check the piston and piston rings
for damage.
7-77
Check the cylinder for scratches. 7-79
Symptom 2 Cause Checking steps
See
page
Spark plug does not
produce a spark
(some cylinders)
Spark plug malfunction Check the spark plug. 7-41
Short, open, or loose con-
nection in ignition coil cir-
cuit
Measure the ignition coil input volt-
age.
5-35
Check for wiring continuity between
the ignition coil and the engine
ECM.
A-14
Check for wiring continuity between
the ignition coil and the electrical
management box.
A-14
Ignition coil malfunction
Exchange the ignition coil with a dif-
ferent one, and then check the igni-
tion spark.
5-35
Engine ECM malfunction Replace the engine ECM. 7-38
Symptom 2 Cause Checking steps
See
page
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