TROUBLESHOOTING
SERVICE MANUAL NUMBER 25
Engine Acceleration Is Poor
Cause
Special Instructions
Also refer to “Poor Boat Performance”
Idle mixture screws
Incorrect ignition timing
Incorrect distributor or amplifier advance
curve
Refer to SECTION 4B
Cracked or dirty distributor cap or rotor
Vacuum leak
Intake manifold
Fouled, burned; wrong heat range;
cracked porcelain
Spark plugs
Low compression
Troubleshooting with Vacuum Gauge
Reading
Cause
Steady reading between 15-21 inches at
idle rpm
Normal
Extremely low reading, but steady at idle
rpm
Vacuum leak; incorrect timing;
underpowered boat; faulty boat bottom
Fluctuates between high and low at idle
rpm
Blown head gasket between two adjacent
cylinders
Fluctuates 4 or 5 inches very slowly at idle Spark plug gap too narrow, valves are
rpm
sticking
Fluctuates rapidly at idle, steadies as rpm
is increased
Valve guides are worn
Continuously fluctuates between low and
normal reading at regular intervals at idle
rpm
Burned or leaking valve
Page 1C-16
90-861328--1 NOVEMBER 1999
| Categories | Mercury MerCruiser Manuals |
|---|---|
| Tags | Mercury MerCruiser 1262 CID, Mercury MerCruiser 262 CID |
| Model Year | 1998, 1999, 2000, 2001 |
| Download File |
|
| Document File Type | |
| Copyright | Attribution Non-commercial |
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