SERVICE MANUAL NUMBER 24
FUEL INJECTION SYSTEM TROUBLESHOOTING
Cuts Out, Misses Symptom
Step
Action
Yes
No
PROCEED TO
Definition: Steady pulsation or jerking that follows engine speed, usually more
pronounced as engine load increases. The exhaust has a steady spitting sound at
idle, low speed or on hard acceleration for fuel starvation that can cause engine to
cut out.
Was the “On-Board Diagnostic” (OBD)
System Check performed?
1
Step 2
Step 3
OBD
Visual/ Physical
Check
2
3
Was visual/physical check performed?
1.
Check for contaminated fuel.
2. Check water separating fuel filter.
Was a problem found?
Step 4
Step 5
1.
Check for proper fuel pressure while the
condition exists.
•
Refer to Table A-4 in “General System
Diagnostics” section.
4
5
Was fuel pressure 30 psi for EFI or 3–7 psi
for carbureted engines?
1.
Disconnect all injector harness connectors
and install an injector test light J 34730-2
between the harness terminal connector of
each injector.
2. Crank engine and note light on each con-
nector. If test light fails to blink at any one of
the connectors, it is a faulty injector drive
circuit harness, connector or terminal.
Was a problem found?
Step 6
1.
Check fuel injectors.
•
Refer to Injector Balance Test in “General
System Diagnostics” section.
6
7
Was a problem found?
Check for proper spark at each cylinder.
Was a problem found?
Step 7
Step 8
1.
OBD
1.
•
Check the spark plugs for the following:
Insulator cracks.
•
Improper gap.
•
•
Burned electrodes.
Heavy deposits.
8
NOTE: If spark plugs are gas or oil fouled, the
cause of the fouling must be determined before
replacing the spark plugs.
Were spark plugs damaged?
OBD
Step 9
Index
90-861327--1
OCTOBER 1999
Page 5F-15
| 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 |
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