SERVICE MANUAL NUMBER 23
FUEL INJECTION SYSTEM TROUBLESHOOTING
Surges and/or Chuggles Symptom
Step
Action
Value(s)
Yes
No
Definition: Engine power variation under steady throttle or cruise. Feels like the engine
speeds up and slows down with no change in the throttle lever position.
Was the “On-Board Diagnostic” (OBD)
System Check performed?
Go to OBD
1
-
-
Go to Step 2 System Check
Was visual/physical check performed?
Go to Visual/
Physical
Check
2
Go to Step 3
1.
Check for engine going into rpm
reduction mode.
Not
Applicable
to
MerCruiser
EFI or MPI
3
4
2. If a problem is found, repair as
necessary.
Was a problem found?
-
-
Go to Step 4
1.
2.
Check for contaminated fuel.
Check
fuel
filters
and
water
separator.
If a problem is found, repair as
necessary.
3.
Go to OBD
System
Check
Was a problem found?
Go to Step 5
1.
Check for proper fuel pressure while
the condition exists.
•
Refer to Table A-4 in “General Sys-
tem Diagnostics” section.
5
2.
If a problem is found, repair as
necessary.
Go to OBD
System
Check
Was a problem found?
-
Go to Step 6
1.
Check for intermittent opens or short
to grounds in the ECT sensor, MAP
sensor and TP sensor circuits. Also
check or throttle linkage sticking,
binding or worn.
6
2.
3.
An intermittent failure may not store
a DTC.
If a problem is found, repair as
necessary.
Go to OBD
System
Check
Was a problem found?
-
Go to Step 7
1.
Check for proper ignition voltage
output.
•
Refer to Table A-7 in “General Sys-
tem Diagnostics” section.
7
8
2.
If a problem is found, repair as
necessary.
Go to OBD
System
Check
Was a problem found?
-
-
Go to Step 8
1.
Check ignition coil for cracks or
carbon tracking.
2. If a problem is found, repair as
necessary.
Was a problem found?
Go to OBD
System
Check
Go to Step 9
Index
90-861326--1 MARCH 1999
Page 5D-11
| 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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