SERVICE MANUAL NUMBER 23
FUEL INJECTION SYSTEM TROUBLESHOOTING
Page 5D-11
90-861326--1 MARCH 1999
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.
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 for engine going into rpm
reduction mode.
2. If a problem is found, repair as
necessary.
Was a problem found?
-
Not
Applicable
to
MerCruiser
EFI or MPI
Go to Step 4
4
1. Check for contaminated fuel.
2. Check fuel filters and water
separator.
3. If a problem is found, repair as
necessary.
Was a problem found?
-
Go to OBD
System
Check
Go to Step 5
5
1. Check for proper fuel pressure while
the condition exists.
•
Refer to
Table A-4 in “General Sys-
tem Diagnostics” section.
2. If a problem is found, repair as
necessary.
Was a problem found?
-
Go to OBD
System
Check
Go to Step 6
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.
2. An intermittent failure may not store
a DTC.
3. If a problem is found, repair as
necessary.
Was a problem found?
-
Go to OBD
System
Check
Go to Step 7
7
1. Check for proper ignition voltage
output.
•
Refer to Table A-7 in “General Sys-
tem Diagnostics” section.
2. If a problem is found, repair as
necessary.
Was a problem found?
-
Go to OBD
System
Check
Go to Step 8
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
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