FUEL INJECTION SYSTEM TROUBLESHOOTING SERVICE MANUAL NUMBER 23
Page 5D-10 90-861326--1 MARCH 1999
Hard Start Symptom (Continued)
15
1. Check for proper operation of the TP
sensor.
2. Check or throttle linkage sticking,
binding or worn causing TP sensor
voltage to be higher than normal.
3. If a problem is found, repair as nec-
essary.
Was a problem found?
-
Go to
OBD
System
Check
Go to
Step 16
16
1. Check for proper operation of the
IAC valve.
• Refer to Table A-8 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 17
17
1. Check or the following Engine
Mechanical problems:
• Low compression.
• Leaking cylinder head gaskets.
• Worn or incorrect camshaft.
• Proper valve timing/valve train prob-
lem.
• Restricted exhaust system.
2. If a problem is found, repair as nec-
essary.
Was a problem found?
-
Go to
OBD
System
Check
Go to
Step 18
18
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 system.
3. If a problem is found, repair as nec-
essary.
Was a problem found?
-
Go to
OBD
System
Check
Contact
MerCruiser
Customer
Service
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