SERVICE MANUAL NUMBER 24
FUEL INJECTION SYSTEM TROUBLESHOOTING
Backfire Symptom
Step
Action
Yes
No
PROCEED TO
Definition: Fuel ignites in the intake manifold, or in the exhaust system, making
loud popping noise.
Was the “On-Board Diagnostic” (OBD)
System Check performed?
1
Step 2
Step 3
OBD
Was visual/physical check performed?
Visual/ Physical
Check
2
3
1.
Check flame arrestor for proper installa-
tion.
Was a problem found?
Step 4
1.
•
Check for proper fuel pressure.
Refer to Table A-4 in “General System
Diagnostics” section.
4
Was fuel pressure 30 psi for EFI or 3–7 psi
for carbureted engines?
Step 5
Step 6
1.
Check the injector connections. Correct as
necessary.
5
6
Was a problem found?
1.
•
Check fuel injectors.
Refer to Injector Balance Test in “Gener-
al System Diagnostics” section.
Was a problem found?
Step 7
Step 8
1.
Check for proper operation of Ignition Con-
trol (IC) circuit and the Knock Sensor (KS)
circuit.
7
Was a problem found?
1.
Check integrity of the primary and second-
ary wiring.
2.
3.
Check routing of the wiring.
Check condition of IC module, pick-up coil,
distributor cap, rotor and spark plug wires.
8
9
Was a problem found?
Step 9
1.
Check ignition coil for cracks or carbon
tracking.
Were cracks or carbon tracks found?
OBD
Step 10
Index
90-861327--1
OCTOBER 1999
Page 5F-23
| 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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