FUEL INJECTION SYSTEM TROUBLESHOOTING
SERVICE MANUAL NUMBER 23
Backfire Symptom (Continued)
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.
An intermittent failure may not store
a DTC.
12
2.
3.
If a problem is found, repair as nec-
essary.
Go to OBD
System
Check
Was a problem found?
-
Go to Step 13
1.
Checkenginemechanicalforthefol-
lowing conditions:
•
•
Low compression.
Sticking or leaking valves.
13
14
• Worn camshaft lobe(s).
•
Incorrect valve timing.
2.
If a problem is found, repair as nec-
essary.
Go to OBD
System
Check
Was a problem found?
-
-
Go to Step 14
Go to Step 15
1.
Check Intake and exhaust man-
ifold(s) for casting flash.
2. If a problem is found, repair as nec-
essary.
Was a problem found?
Go to OBD
System
Check
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.
15
Contact
MerCruiser
Customer
Service
3.
If a problem is found, repair as nec-
essary.
Go to OBD
System
Check
Was a problem found?
-
Index
Page 5D-32
90-861326--1 MARCH 1999
| Categories | Mercury MerCruiser Manuals |
|---|---|
| Tags | Mercury MerCruiser 454 CID, Mercury MerCruiser 502 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 GM V8 GM V8 454 CID 7.4L and 502 cid 8.2L Marine Engines Service Manual Number 23 5.0 out of 5.0 based on 1 product reviews. Just need the manual. Wrote review. Can't technically review what I haven't seen yet...