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Symptom Troubleshooting Chart - Engine

SYMPTOM TROUBLESHOOTING CHART - ENGINE

Condition Possible Sources Action
  • Difficult starting
  • Inoperative or damaged ignition system
  • Air or vacuum leak
  • Inoperative or damaged fuel system
  • Inoperative or damaged starting system
 
  • Damaged charging system/battery
  • Burnt valve
  • Worn piston
  • Worn piston rings
  • Worn cylinder
  • INSTALL a new short block.
  • Damaged head gasket
  • INSTALL a new cylinder head gasket
  • Inoperative or damaged cooling system (fail-safe cooling invoked)
  • Poor idling
  • Vacuum leaks
  • Inoperative or damaged exhaust gas recirculation (EGR) system
  • Inoperative or damaged ignition system
  • Inoperative or damaged cooling system (fail-safe cooling invoked)
  • Incorrect valve clearance
  • Incorrect valve-to-valve seat contact
 
  • Damaged head gasket
  • Abnormal combustion
  • Inoperative or damaged fuel system
  • Air or vacuum leaks
  • EGR system fault
  • Inoperative or damaged cooling system (fail-safe cooling invoked)
  • Inoperative or damaged ignition system
  • Burnt or sticking valve
  • Weak or broken valve spring
  • Carbon accumulation in combustion chamber
  • ELIMINATE carbon buildup.
  • Excessive oil consumption
  • Leaking oil
  • REPAIR oil leakage.
  • Inoperative PCV system
  • REPAIR or INSTALL new components as necessary. See POSITIVE CRANKCASE VENTILATION (PCV) VALVE REMOVAL/INSTALLATION - 3.0L01-16A-10
  • Incorrect oil
 
  • Worn valve stem seal
  • Worn valve stem or valve guide
  • Sticking piston rings
  • Worn piston ring groove
  • Worn piston or cylinder
  • INSTALL a new short block.
Engine noise
  • Excessive valve guide clearance
  • INSTALL a new short block.
  • Leaking exhaust system
  • REPAIR exhaust leakage.
  • Incorrect drive belt tension
  • Worn generator bearing
  • Worn or damaged coolant pump bearing
  • Inoperative or damaged cooling system
  • Inoperative or damaged fuel system
  • Ignition system knock (spark knock)
  • Inoperative or damaged EGR system
  • Air leaks
  • Loose timing chain
 
  • Damaged timing chain tensioner
  • Excessive main bearing clearance
  • Seized or heat damaged crankshaft main bearing
  • Excessive crankshaft end play
  • Excessive connecting rod bearing clearance
  • Heat damaged connecting rod bearing
  • Damaged connecting rod bushing
  • Worn cylinder
  • Worn piston or piston pin
  • Damaged piston rings
  • Bent connecting rod
  • INSTALL a new short block.
  • Worn or damaged valve tappet
  • INSTALL a new valve tappet. See VALVE TAPPETS REMOVAL/INSTALLATION - 2.5L01-10B-22.
  • Excessive valve tappet clearance
  • Broken valve spring
  • Excessive valve guide clearance
Insufficient power
  • Inoperative or damaged ignition system
  • Air intake system blockage
  • Lubrication system blockage
  • Inoperative or damaged fuel system
  • Oil level too high
  • DRAIN oil to correct level.
  • Incorrect engine oil
  • INSTALL correct specification engine oil.
  • Excessive accessory drive belt loading
  • Inoperative or damaged cooling system (fail-safe cooling invoked)
  • Damaged or plugged exhaust system
  • INSPECT exhaust system.
  • Incorrect tire size
  • Dragging brakes
  • Slipping transmission
  • Incorrect valve clearance
  • ADJUST valve clearance. See VALVE CLEARANCE CHECK - 2.5L01-10A-11.
  • Worn or damaged valve tappet
  • INSTALL a new valve tappet. See VALVE TAPPETS REMOVAL/INSTALLATION - 2.5L01-10B-22.
  • Damaged valve tappet guide
  • Compression leakage at valve seat
  • Seized valve stem
 
  • Weak or broken valve spring
  • Worn or damaged cam
  • Damaged head gasket
  • Cracked or distorted cylinder head
  • Damaged, worn or sticking piston ring(s)
  • Worn or damaged piston
  • INSTALL a new short block.
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