FUEL INJECTION SYSTEM TROUBLESHOOTING SERVICE MANUAL NUMBER 23
Page 5D-26 90-861326--1 MARCH 1999
Rough, Unstable, or Incorrect Idle, Stalling Symptom (Continued)
17
1. Check the following Engine
Mechanical items:
• Check compression.
• Sticking or leaking valves.
• Worn camshaft lobe(s).
• Valve timing.
• Broken valve springs.
2. If a problem is found, repair as nec-
essary.
Was a problem found?
-
Go to
OBD
System
Check
Go to
Step 18
18
1. Check intake valves for valve
deposits.
2. If deposits are found, remove as
necessary.
Were deposits found on the intake
valves?
-
Go to
OBD
System
Check
Go to
Step 19
19
1. Check for faulty motor mounts.
2. If a problem is found, repair as nec-
essary.
Was a problem found?
-
Go to
OBD
System
Check
Go to
Step 20
20
1. Review all diagnostic procedures
within this table.
2. If all procedures have been com-
pleted and no malfunctions have
been found, review/inspect the fol-
lowing:
• Visual/physical inspection.
• Scan tool data.
• All electrical 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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