Engine Control System - Trouble Shooting - No Codes - 4.2L

• Introduction
• Preliminary Inspection
• Symptoms
  • Notes
  • Symptom Diagnosis
  • Detonation/Spark Knock
    • Symptom Definition
    • Possible Causes & Corrections
  • Engine Backfires
    • Symptom Definition
    • Possible Causes & Corrections
  • Engine Cuts Out, Misses
    • Symptom Definition
    • Possible Causes & Corrections
  • Engine Dieseling/Run-On
    • Symptom Definition
    • Possible Causes & Corrections
  • Hard Start
    • Symptom Definition
    • Possible Causes & Corrections
  • Hesitation, Sag Or Stumble
    • Symptom Definition
    • Possible Causes & Corrections
  • Lack Of Power Or Sluggish
    • Symptom Definition
    • Possible Causes & Corrections
  • Poor Fuel Economy
    • Symptom Definition
    • Possible Causes & Corrections
  • Poor Fuel Fill Quality
    • Symptom Definition
    • Possible Cause & Correction
  • Rough, Unstable Or Incorrect Idle & Stalling
    • Symptom Definition
    • Possible Causes & Corrections
  • Vehicle Surges Or CHUGGLES
    • Symptom Definition
    • Possible Causes & Corrections
  • Restricted Exhaust
• INTERMITTENTS
  • Notes
  • Preliminary
  • Harness Or Connector INTERMITTENTS
  • Electrical Connections Or Wiring
  • Control Module Power & Grounds, & Component Power & Grounds
  • Temperature Sensitivity
  • Electromagnetic Interference & Electrical Noise
  • Incorrect Pcm Programming
  • Duplicating Failure Conditions
  • Scan Tool Snapshot
  • Vehicle Data Recorder