SERVICE MANUAL NUMBER 23
FUEL INJECTION SYSTEM TROUBLESHOOTING
Detonation/Spark Knock Symptom (Continued)
1.
2.
3.
Check for good ignition system
ground.
Check spark plugs for proper gap
and heat range.
If a problem is found, repair as
necessary.
5
Go to OBD
System
Check
Was a problem found?
-
-
Go to Step 6
Go to Step 7
Go to Step 8
1.
2.
Check for contaminated fuel.
Check for poor fuel quality and
proper octane rating.
If a problem is found, repair as
necessary.
6
7
3.
Go to OBD
System
Check
Was a problem found?
1.
•
Check for proper fuel pressure.
Refer to Table A-4 in “General Sys-
tem Diagnostics” section.
If a problem is found, repair as
necessary.
2.
Go to OBD
System
Check
Was a problem found?
-
-
8
9
Is a scan tool being used?
Go to Step 9 Go to Step 10
If scan tool readings are normal (Refer
to “Scan Tool Normal Specifications” in
this section) and there are no engine
mechanical faults, fill fuel tank with a
known high quality gasoline.
Go to Step
10
Go to OBD
System Check
Is detonation present?
-
1.
Check for obvious overheating
problems:
•
•
Loose water pump belt.
Faulty or incorrect water pump.
10
11
• Restriction in cooling system.
•
Faulty or incorrect thermostat.
2.
If a problem is found, repair as
necessary.
Go to OBD
System
Check
Was a problem found?
-
-
Go to Step 11
Go to Step 12
1.
Check fuel delivery system items
thatcancauseanenginetorunlean.
2. If a problem is found, repair as nec-
essary.
Was a problem found?
Go to OBD
System
Check
Index
90-861326--1 MARCH 1999
Page 5D-17
| Categories | Mercury MerCruiser Manuals |
|---|---|
| Tags | Mercury MerCruiser 454 CID, Mercury MerCruiser 502 CID |
| Model Year | 1998, 1999, 2000, 2001 |
| Download File |
|
| Document File Type | |
| Copyright | Attribution Non-commercial |
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