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Engine Symptom Chart

ENGINE SYMPTOM CHART

Problem Possible Cause Action
  • Difficult Starting
  • Damaged ignition system.
 See TEST 17: IGNITION SCOPE TEST .
  • Damaged fuel system.
 See TEST 5: FUEL DELIVERY SYSTEM .
  • Damaged starting system.
 See STARTERS article.
  • Damaged charging system/battery.
 See GENERATORS & REGULATORS article.
  • Burnt valve.
  • Worn piston.
  • Worn piston rings.
  • Worn cylinder.
  • Damaged head gasket.
  • Poor Idling
  • Vacuum leaks.
 See ENGINE COMPONENT TESTS .
  • Malfunctioning or damaged ignition system.
 See TEST 17: IGNITION SCOPE TEST .
  • Malfunctioning or damaged fuel system.
 See TEST 5: FUEL DELIVERY SYSTEM .
  • Damaged valve tappet (4.0L engine) or lash adjuster (2.5L engine).
  • Damaged valve tappet guide or lash adjuster (3.0L engine).
  • Improper valve-to-valve seat contact.
  • Damaged head gasket.
  • Abnormal Combustion
  • Malfunctioning or damaged fuel system.
 See TEST 5: FUEL DELIVERY SYSTEM .
  • Malfunctioning or damaged ignition system.
 See TEST 17: IGNITION SCOPE TEST .
  • Damaged valve tappet (4.0L engine) or lash adjuster (2.5L engine).
  • Damaged valve tappet guide or valve tappet (3.0L engine).
  • Burnt or sticking valve.
  • Weak or broken valve spring.
  • Carbon accumulation in combustion chamber.
  • Eliminate carbon buildup.
  • Excessive Oil Consumption
  • Leaking oil.
  • Malfunctioning PCV system.
  • Repair or replace the necessary components.
  • Worn valve stem seal.
  • Worn valve stem or valve guide.
  • Replace valve and/or valve guide. Refer to OVERHAUL in 2.5L 4-Cylinder article, OVERHAUL in 3.0L V6 article or OVERHAUL in 4.0L V6 article in ENGINE.
  • Sticking piston rings.
  • Repair or replace piston rings. Refer to OVERHAUL in 2.5L 4-CYLINDER article, OVERHAUL in 3.0L V6 article or OVERHAUL in 4.0L V6 article in ENGINE.
  • Worn piston ring groove.
  • Worn piston or cylinder.
  • Engine Noise
  • Leaking exhaust system.
  • Repair exhaust leakage.
  • Improper drive belt tension.
 See COOLING SYSTEM SPECIFICATIONS & DRIVE BELT ROUTING article.
  • Malfunction generator bearing.
 See GENERATORS & REGULATORS article.
  • Malfunctioning water pump bearing.
 See WATER PUMP in 2.5L 4-CYLINDER article, WATER PUMP in 3.0L V6 article orWATER PUMP in 4.0L V6 article in ENGINE.
  • Malfunctioning or damaged cooling system.
 Repair cooling system as necessary
  • Malfunctioning or damaged fuel system.
 See TEST 5: FUEL DELIVERY SYSTEM .
  • Loose timing chain/belt.
  • Damaged timing chain tensioner.
  • Replace timing chain tensioner
  • Engine Noise (cont'd)
  • Excessive main bearing clearance.
 Refer to ENGINE COMPONENT TESTS .
  • Seized or heat damaged crankshaft main bearing.
  • Replace crankshaft main bearing. Refer to OVERHAUL in 2.5L 4-Cylinder article or OVERHAUL in 3.0L V6 article or OVERHAUL in 4.0L V6 article in ENGINE.
  • Excessive crankshaft end play.
  • Replace thrust bearing or crankshaft. Refer to OVERHAUL in 2.5L 4-Cylinder article, OVERHAUL in 3.0L V6 article or OVERHAUL in 4.0L V6 article in ENGINE.
  • Excessive connecting rod bearing clearance.
  • Replace connecting rod bearing or connecting rod. Refer to OVERHAUL in 2.5L 4-Cylinder article, OVERHAUL in 3.0L V6 article or OVERHAUL in 4.0L V6 article in ENGINE
  • Heat damaged connecting rod bearing.
  • Replace connecting rod bearing. Refer to OVERHAUL in 2.5L 4-Cylinder article, OVERHAUL in 3.0L V6 article or OVERHAUL in 4.0L V6 article in ENGINE.
  • Damaged connecting rod bushing.
  • Replace connecting rod bushing. Refer to OVERHAUL in 2.5L 4-Cylinder article, OVERHAUL in 3.0L V6 article or OVERHAUL in 4.0L V6 article in ENGINE.
  • Worn cylinder.
  • Worn piston or piston pin.
  • Damaged piston rings.
  • Replace piston rings. Refer to OVERHAUL in 2.5L 4-Cylinder article, OVERHAUL in 3.0L V6 article or OVERHAUL in 4.0L V6 article in ENGINE.
  • Engine Noise (cont'd)
  • Bent connecting rod.
  • Malfunctioning valve tappet or lash adjuster.
  • Excessive valve tappet or lash adjuster clearance.
  • Adjust clearance or replace valve tappet guide or valve tappet. Refer to 2.5L 4-CYLINDER article, 3.0L V6 article or 4.0L V6 article in ENGINE.
  • Broken valve spring.
  • Excessive valve guide clearance.
  • Repair clearance or replace valve guide and stem. Refer to OVERHAUL in 2.5L 4-Cylinder article or OVERHAUL in 3.0L V6 article or OVERHAUL in 4.0L V6 article in ENGINE.
  • Insufficient Power
  • Malfunctioning or damaged ignition system.
 See TEST 17: IGNITION SCOPE TEST .
  • Malfunctioning or damaged fuel system.
 See TEST 5: FUEL DELIVERY SYSTEM .
  • Damaged or plugged exhaust system.
  • Incorrect tire size.
  • Dragging brakes.
  • Slipping transmission.
  • Inspect exhaust system.

    Refer to the owner's manual.

    See DISC & DRUM article in Brakes.

    See SYMPTOM TESTS for 2.5L & 3.0L or SYMPTOM TESTS for 4.0L in appropriate DIAGNOSIS article in TRANSMISSION.
  • Malfunctioning valve tappet (4.0L engine) or lash adjuster (2.5L engine).
  • Damaged valve tappet guide or valve tappet (3.0L engine).
  • Replace valve tappet guide or valve tappet.

    See 3.0L V6 article in ENGINE.
  • 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.
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