FUEL INJECTION SYSTEM TROUBLESHOOTING
SERVICE MANUAL NUMBER 24
Lack of Power, Sluggish or Spongy Symptom (Continued)
Step
Action
Yes
No
PROCEED TO
1.
Check ignition coil for cracks or carbon
tracking.
11
Were cracks or carbon tracks found?
Step 12
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.
An intermittent failure may not store a DTC.
12
13
2.
Was a problem found?
Step 13
Step 14
1.
Check ECM grounds for being clean, tight
and in their proper locations.
Were
ECM
grounds
dirty,
loose
or
improperly connected?
OBD
1.
Check diagnostic test CKT 451 for being
shorted to ground. This will cause the rpm
to be lowered.
14
15
Was a problem found?
Check for proper alternator voltage output.
Is voltage between 11 - 16 volts?
Step 15
Step 16
1.
1.
Check for the following Engine Mechanical
problems:
•
•
•
•
•
Low compression.
Leaking cylinder head gaskets.
Worn or incorrect camshaft.
Proper valve timing/valve train problem.
Restricted exhaust system.
16
17
Was a problem found?
Step 17
Step 18
1.
Check for excessive resistance on the bot-
tom of the boat such as dirt, barnacles, etc.
2. Check for proper propeller size and pitch
for that application.
Was a problem found?
OBD
1.
Review all diagnostic procedures within
this table.
2.
When all procedures have been completed
and no malfunctions are found, review/in-
spect the following:
18
•
•
•
Visual/physical inspection.
Scan tool data.
All connections within a suspected circuit
and/or system.
Contact
MerCruiser
Customer
Service
Was a problem found?
OBD
Index
Page 5F-10
90-861327--1 OCTOBER 1999
| Categories | Mercury MerCruiser Manuals |
|---|---|
| Tags | Mercury MerCruiser 305 CID, Mercury MerCruiser 350 CID |
| Model Year | 1998, 1999, 2000, 2001 |
| Download File |
|
| Document File Type | |
| Copyright | Attribution Non-commercial |
(1 votes, average: 4 out of 4)
Marine readers have rated Mercury MerCruiser Engines Service Manual Number 24 GM V-8 305 CID 350 CID 4.0 out of 4.0 based on 1 product reviews. Great performance engine.
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