Mercury MerCruiser MCM 454 Mag MPI Service Manual page 560

SERVICE MANUAL NUMBER 23
Section 5D - Fuel Injection System Troubleshooting
Table of Contents
Troubleshooting . . . . . . . . . . . . . . . . . . . . .
Diagnostic Trouble Codes for the
MEFI 1 454 / 502 Mag MPI and
8.2L MPI Engines
Diagnostic Trouble Codes for the
MEFI 2 7.4L MPI Engines
Diagnostic Trouble Codes for the
MEFI 3 454 cid (7.4L)/502 cid
(8.2L) Engines
Scan Tool Normal Specifications (Idle /
Warm Engine / Closed Throttle /
Neutral) . . . . . . . . . . . . . . . . . . . . . . . .
Important Preliminary Checks
Index
90-861326--1 MARCH 1999
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FUEL SYSTEM
5D-2
. . . . . . . . . . . . . . . 5D-2
. . . . . . . . 5D-2
. . . . . . . . . . . . . . . . . . 5D-3
5D-5
. . . . . . 5D-6
FUEL INJECTION SYSTEM TROUBLESHOOTING
Visual/Physical Check . . . . . . . . . . . . .
Hard Start Symptom . . . . . . . . . . . . . .
Surges and/or Chuggles Symptom
Lack of Power, Sluggish or Spongy
Symptom . . . . . . . . . . . . . . . . . . . . . . .
Detonation/Spark Knock Symptom
Hesitation, Sag, Stumble Symptom
Cuts Out, Misses Symptom
Rough, Unstable, or Incorrect Idle,
Stalling Symptom . . . . . . . . . . . . . . . .
Poor Fuel Economy Symptom
Dieseling, Run-On Symptom
Backfire Symptom . . . . . . . . . . . . . . . .
5D-6
5D-8
. . 5D-11
5D-13
. . 5D-16
. 5D-19
. . . . . . . . 5D-21
5D-23
. . . . . . 5D-27
. . . . . . . 5D-29
5
5D-30
D
Page 5D-1