FUEL INJECTION SYSTEM TROUBLESHOOTING SERVICE MANUAL NUMBER 23
Page 5D-30 90-861326--1 MARCH 1999
Dieseling, Run-On Symptom (Continued)
7
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 sys-
tem.
3. If a problem is found, repair as nec-
essary.
Was a problem found?
-
Go to
OBD
System
Check
Contact
MerCruiser
Customer
Service
Backfire Symptom
Step Action Value(s) Yes No
Definition: Fuel ignites in the intake manifold, or in the exhaust system, making loud
popping noise.
1
Was the “On-Board Diagnostic” (OBD)
System Check performed?
-
Go to
Step
2
Go to
OBD
System Check
2
Was visual/physical check performed?
-
Go to
Step
3
Go to
Visual/
Physical
Check
3
1. Check flame arrestor for proper
installation.
2. If a problem is found, repair as nec-
essary.
Was a problem found?
-
Go to
OBD
System
Check
Go to
Step
4
4
1. Check for proper fuel pressure.
•
Refer to
Table A-4 in “General Sys-
tem Diagnostics” section.
2. If a problem is found, repair as nec-
essary.
Was a problem found?
-
Go to
OBD
System
Check
Go to
Step
5
5
Check the injector connections. If any of
the injectors are connected to an
incorrect cylinder, correct as necessary.
Was a problem found?
-
Go to
OBD
System
Check
Go to
Step
6
6
1. Check fuel injectors.
•
Refer to
Injector Balance Test in
“General System Diagnostics” sec-
tion.
2. If a problem is found, repair as nec-
essary.
Was a problem found?
-
Go to
OBD
System
Check
Go to
Step
7
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