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SERVICE MANUAL NUMBER 23

FUEL INJECTION SYSTEM TROUBLESHOOTING

Page 5D-1

90-861326--1 MARCH 1999

FUEL SYSTEM

Section 5D - Fuel Injection System Troubleshooting

Table of Contents

Troubleshooting 5D-2. . . . . . . . . . . . . . . . . . . . .

Diagnostic Trouble Codes for the

MEFI 1 454 / 502 Mag MPI and

8.2L MPI Engines 5D-2. . . . . . . . . . . . . . .

Diagnostic Trouble Codes for the

MEFI 2 7.4L MPI Engines 5D-2. . . . . . . .

Diagnostic Trouble Codes for the

MEFI 3 454 cid (7.4L)/502 cid

(8.2L) Engines 5D-3. . . . . . . . . . . . . . . . . .

Scan Tool Normal Specifications (Idle /

Warm Engine / Closed Throttle /

Neutral) 5D-5. . . . . . . . . . . . . . . . . . . . . . . .

Important Preliminary Checks 5D-6. . . . . .

Visual/Physical Check 5D-6. . . . . . . . . . . . .

Hard Start Symptom 5D-8. . . . . . . . . . . . . .

Surges and/or Chuggles Symptom 5D-11. .

Lack of Power, Sluggish or Spongy

Symptom 5D-13. . . . . . . . . . . . . . . . . . . . . . .

Detonation/Spark Knock Symptom 5D-16. .

Hesitation, Sag, Stumble Symptom 5D-19.

Cuts Out, Misses Symptom 5D-21. . . . . . . .

Rough, Unstable, or Incorrect Idle,

Stalling Symptom 5D-23. . . . . . . . . . . . . . . .

Poor Fuel Economy Symptom 5D-27. . . . . .

Dieseling, Run-On Symptom 5D-29. . . . . . .

Backfire Symptom 5D-30. . . . . . . . . . . . . . . .

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Index

Mercury MerCruiser MIE 8.2L MPI User Manual

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