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Symptom Chart

SYMPTOM CHART

Condition Possible Sources Action
  • Difficult starting
  • Damaged ignition system
  • Damaged fuel system
  • Damaged starting system
  • Refer to the appropriate ENGINE article for the procedure. REFER to the Worldwide Diagnostic System (WDS) Vehicle Communication Module (VCM) with appropriate adapters, or equivalent diagnostic tool.
  • Damaged charging system/battery
  • Burnt valve
  • INSTALL a new valve.
  • Worn piston
  • For 4.0L engines, INSTALL a new piston and connecting rod assembly. For 4.6L engines, INSTALL a new piston.
  • Worn piston rings
  • INSTALL new piston rings.
  • Worn cylinder
  • REPAIR or INSTALL a new cylinder block.
  • Damaged head gasket
  • INSTALL a new head gasket.
  • Damaged cooling system
  • Refer to the appropriate ENGINE article for the procedure. REFER to the Worldwide Diagnostic System (WDS) Vehicle Communication Module (VCM) with appropriate adapters, or equivalent diagnostic tool.
  • Poor idling
  • Vacuum leaks
  • Malfunctioning or damaged ignition system
  • Malfunctioning or damaged fuel system
  • Refer to the appropriate ENGINE article for the procedure. REFER to the Worldwide Diagnostic System (WDS) Vehicle Communication Module (VCM) with appropriate adapters, or equivalent diagnostic tool.
  • Damaged valve tappet or lash adjuster
  • INSTALL a new valve tappet or lash adjuster.
  • Damaged valve tappet guide or valve tappet
  • INSTALL a new valve tappet guide or valve tappet.
  • Incorrect valve-to-valve seat contact
  • REPAIR or INSTALL a new valve or valve seat.
  • Damaged head gasket
  • INSTALL a new head gasket.
  • Worn or damaged engine support brackets
  • INSTALL a new engine support brackets.
  • Worn or damaged engine support insulators
  • INSTALL a new engine support insulator.
  • Worn or damaged transmission insulator and retainer
  • INSTALL a new transmission insulator and retainer.
  • Abnormal combustion
  • Malfunctioning or damaged fuel system
  • Malfunctioning or damaged ignition system
  • Malfunctioning or damaged air intake system
  • Refer to the appropriate ENGINE article for the procedure. REFER to the Worldwide Diagnostic System (WDS) Vehicle Communication Module (VCM) with appropriate adapters, or equivalent diagnostic tool.
  • Damaged valve tappet or lash adjuster
  • INSTALL a new valve tappet or lash adjuster.
  • Damaged valve tappet guide or valve tappet
  • INSTALL a new valve tappet guide or valve tappet.
  • Burnt or sticking valve
  • REPAIR or INSTALL a new valve.
  • Weak or broken valve spring
  • INSTALL a new valve spring.
  • Carbon accumulation in combustion chamber
  • ELIMINATE carbon buildup.
  • Excessive oil consumption
  • Leaking oil
  • REPAIR oil leakage.
  • Malfunctioning PCV system
  • REPAIR or INSTALL new necessary components.
  • Worn valve stem seal
  • INSTALL a new valve stem seal.
  • Worn valve stem or valve guide
  • INSTALL a new valve and valve guide.
  • Sticking piston rings
  • For 4.0L engines, INSTALL a new piston and connecting rod assembly. For 4.6L engine, REPAIR or INSTALL new piston rings.
  • Worn piston ring groove
  • For 4.0L engine, INSTALL a new piston and connecting rod assembly. For 4.6L engine, INSTALL a new piston and piston pin.
  • Worn piston or cylinder
  • REPAIR or INSTALL a new piston or cylinder block.
  • Engine noise
  • Leaking exhaust system
  • REPAIR exhaust leakage.
  • Incorrect drive belt tension
  • Malfunctioning generator bearing
  • Malfunctioning water pump bearing
  • Malfunctioning or damaged cooling system
  • Malfunctioning or damaged fuel system
  • Refer to the appropriate ENGINE article for the procedure. REFER to the Worldwide Diagnostic System (WDS) Vehicle Communication Module (VCM) with appropriate adapters, or equivalent diagnostic tool.
  • Loose timing chain/belt
  • ADJUST or INSTALL a new timing chain/belt.
  • Damaged timing chain tensioner
  • INSTALL a new timing chain tensioner.
  • Excessive main bearing clearance
    CAUTION: Remove the cylinder heads before removing the crankshaft. Failure to do so can result in engine damage.
  • INSTALL a new crankshaft main bearing.
  • Seized or heat-damaged crankshaft main bearing
  • INSTALL a new crankshaft main bearing.
  • Excessive crankshaft end play
  • INSTALL a new thrust bearing or crankshaft.
  • Excessive connecting rod bearing clearance
  • INSTALL a new connecting rod bearing or connecting rod.
  • Heat damaged connecting rod bearing
  • INSTALL a new connecting rod bearing.
  • Damaged connecting rod bushing
  • For 4.0L engine, INSTALL a new piston and connecting rod assembly. For 4.6L engine, INSTALL a new connecting rod bushing.
  • Worn cylinder
  • REPAIR or INSTALL a new cylinder block.
  • Worn piston or piston pin
  • For 4.0L engine, INSTALL a new piston and connecting rod assembly. For 4.6L engine, INSTALL a new piston or piston pin.
  • Damaged piston rings
  • INSTALL new piston rings.
  • Bent connecting rod
  • For 4.0L engine, INSTALL a new piston and connecting rod assembly. For 4.6L engine, INSTALL a new connecting rod.
  • Malfunctioning valve tappet or lash adjuster
  • INSTALL a new valve tappet or lash adjuster.
  • Excessive valve tappet or lash adjuster clearance
  • ADJUST clearance or INSTALL a new valve tappet guide or valve tappet.
  • Broken valve spring
  • INSTALL a new valve spring.
  • Excessive valve guide clearance
  • ADJUST clearance or INSTALL a new valve guide or valve.
  • Insufficient power
  • Malfunctioning or damaged ignition system
  • Malfunctioning or damaged fuel system
  • Malfunctioning or damaged air intake system
  • Refer to the appropriate ENGINE article for the procedure. REFER to the Worldwide Diagnostic System (WDS) Vehicle Communication Module (VCM) with appropriate adapters, or equivalent diagnostic tool.
  • Damaged or plugged exhaust system
  • INSPECT exhaust system.
  • Incorrect tire size
  • Dragging brakes
  • Slipping transmission
  • Refer to the appropriate Transmission article for the procedure.
  • Malfunctioning valve tappet or lash adjuster
  • INSTALL a new valve tappet or lash adjuster.
  • Damaged valve tappet guide or valve tappet
  • For 4.0L engines, INSTALL a new cylinder head. For 4.6L engines, INSTALL a new valve tappet guide or valve tappet.
  • Compression leakage at valve seat
  • For 4.0L engines, INSTALL a new cylinder head. For 4.6L engines, REPAIR or INSTALL a new valve, valve seat or cylinder head.
  • Seized valve stem
  • For 4.0L engines, INSTALL a new cylinder head. For 4.6L engines, INSTALL a new valve.
  • Weak or broken valve spring
  • INSTALL a new valve spring.
  • Worn or damaged camshaft
  • For 4.0L engines, INSTALL a new cylinder head. For 4.6L engines, INSTALL a new camshaft.
  • Damaged head gasket
  • INSTALL a new head gasket.
  • Cracked or distorted cylinder head
  • INSTALL a new cylinder head.
  • Damaged, worn or sticking piston ring(s)
  • REPAIR or INSTALL a new piston ring(s).
  • Worn or damaged piston
  • For 4.0L engines, INSTALL a new piston and connecting rod assembly. For 4.6L engines, INSTALL a new piston and piston pin.
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