FUEL INJECTION SYSTEM TROUBLESHOOTING SERVICE MANUAL NUMBER 23
Page 5D-28 90-861326--1 MARCH 1999
Poor Fuel Economy Symptom (Continued)
8
1. Visual (physically) check vacuum
hoses for splits, kinks and improper
connections and routing.
2. If a problem is found, repair as nec-
essary.
Was a repair required?
-
Go to
OBD
System
Check
Go to
Step
9
9
1. Check engine compression for
being low.
2. If a problem is found, repair as nec-
essary.
Was a problem found?
-
Go to
OBD
System
Check
Go to
Step
10
10
1. Check exhaust system for possible
restriction.
2. Inspect exhaust system for dam-
aged or collapsed pipes.
3. If a problem is found, repair as nec-
essary.
Was a problem found?
-
Go to
OBD
System
Check
Go to
Step
11
11
1. Check for excessive resistance on
the bottom of the boat such as dirt,
barnacles, etc.
2. Check for proper propeller size and
pitch for that application.
3. If a problem is found, repair as nec-
essary.
Was a problem found?
-
Go to
OBD
System
Check
Go to
Step
12
12
1. Review all diagnostic procedures
within this table.
2. When all procedures have been
completed and no malfunctions are
found, review/inspect the following:
• Visual/physical inspection.
• Scan tool data.
• All connections within a suspected
circuit and/or system.
3. If a problem is found, repair as nec-
essary.
Was a problem found?
-
Go to
OBD
System
Check
Contact
MerCruiser
Customer
Service
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