FUEL INJECTION SYSTEM TROUBLESHOOTING
SERVICE MANUAL NUMBER 24
Backfire Symptom (Continued)
Step
Action
Yes
No
PROCEED TO
1.
2.
Check for proper ignition voltage input to
the ECM.
Check for intermittent open or short to
ground on the ignition voltage input circuit
to the ECM.
10
Was a problem found?
Step 11
1.
Remove spark plugs, check for wet plugs,
cracks, wear, improper gap, burned elec-
trodes or heavy deposits.
•
Refer to Distributor Ignition System in
“Description and System Operation” sec-
tion.
11
NOTE: If park plugs are gas or oil fouled, the
cause of the fouling must be determined before
replacing the spark plugs
Were spark plugs damaged?
Step 12
Step 13
1.
Check for intermittent opens or short to
grounds in the MAP sensor and TP sensor
circuits. Also check for throttle linkage
sticking, binding or worn.
12
2.
An intermittent failure may not store a DTC.
Was a problem found?
1.
Check engine mechanical for the following
conditions:
•
Low compression.
13
14
• Sticking or leaking valves.
•
•
Worn camshaft lobe(s).
Incorrect valve timing.
Was a problem found?
Step 14
Step 15
1.
Check Intake and exhaust manifold(s) for
casting flash.
Was a problem found?
1.
Review all diagnostic procedures within
this table.
2.
If all procedures have been completed and
no malfunctions have been found, review/
inspect the following:
15
•
•
•
Visual/physical inspection.
Scan tool data.
All electrical connections within a sus-
pected circuit and/or system.
Contact
MerCruiser
Customer
Service
Was a problem found?
OBD
Index
Page 5F-24
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 |
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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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