Symptom Chart
Symptom ChartDifficult to start during hot or cold start
Possible Source(s):
^ Piston ring(s) worn, damaged, sticking or worn piston/cylinder.
Action(s) to take:
^ INSTALL a new engine.
Possible Source(s):
^ Head gasket damaged.
Action(s) to take:
^ INSPECT the head gasket.
Possible Source(s):
^ Fuel system damaged or inoperative.
Action(s) to take:
^ Refer to Fuel Delivery and Air Induction.
Possible Source(s):
^ Ignition system inoperative.
Action(s) to take:
^ Refer to Ignition System.
Poor Idling
Possible Source(s):
^ Restricted exhaust system.
Action(s) to take:
^ INSPECT the exhaust system. Refer to Exhaust System.
Possible Source(s):
^ Vacuum leak.
Action(s) to take:
^ CARRY out the Intake Manifold Vacuum Test. REPAIR and INSTALL new components as necessary. Intake Manifold Vacuum Test
Possible Source(s):
^ Burned valve(s).
Action(s) to take:
^ INSPECT the valve(s).
Possible Source(s):
^ Incorrect valve to valve seat contact.
Action(s) to take:
^ INSPECT the valve and valve seat.
Possible Source(s):
^ Head gasket damaged.
Action(s) to take:
^ INSPECT the head gasket.
Possible Source(s):
^ Fuel system damaged or inoperative.
Action(s) to take:
^ Refer to Fuel Delivery and Air Induction.
Insufficient power
Possible Source(s):
^ Compression leakage from valve seat.
Action(s) to take:
^ INSPECT the valve or valve seat.
Possible Source(s):
^ Valve sticking.
Action(s) to take:
^ INSPECT valve stem to valve guide clearance or carbon accumulation.
Possible Source(s):
^ Valve spring weak or broken.
Action(s) to take:
^ INSPECT the valve spring.
Possible Source(s):
^ Head gasket damaged.
Action(s) to take:
^ INSPECT the head gasket.
Possible Source(s):
^ Cylinder head cracked or distorted.
Action(s) to take:
^ INSPECT the cylinder head.
Possible Source(s):
^ Piston ring(s) worn, damaged or sticking.
Action(s) to take:
^ INSTALL a new engine.
Possible Source(s):
^ Fuel system damaged or inoperative.
Action(s) to take:
^ Refer to Fuel Delivery and Air Induction.
Possible Source(s):
^ Brakes dragging.
Action(s) to take:
^ Refer to Brakes and Traction Control.
Possible Source(s):
^ Restricted exhaust system.
Action(s) to take:
^ INSPECT the exhaust system. Refer to Exhaust System.
Excessive or insufficient compression.
Possible Source(s):
^ Valve(s) burnt or sticking.
Action(s) to take:
^ INSPECT the valve(s).
Possible Source(s):
^ Valve spring(s) weak or broken.
Action(s) to take:
^ INSPECT the valve spring(s).
Possible Source(s):
^ Piston ring(s) worn, damaged, sticking or worn piston/cylinder.
Action(s) to take:
^ INSTALL a new engine.
Possible Source(s):
^ Head gasket damaged.
Action(s) to take:
^ INSPECT the head gasket.
Possible Source(s):
^ Carbon accumulation in combustion chamber.
Action(s) to take:
^ ELIMINATE carbon build up.
Possible Source(s):
^ Fuel system damaged or inoperative.
Action(s) to take:
^ Refer to Fuel Delivery and Air Induction.
Excessive oil consumption
Possible Source(s):
^ Piston ring(s) worn, damaged, sticking or worn piston/cylinder.
Action(s) to take:
^ INSTALL a new engine.
Possible Source(s):
^ Valve stem seal worn or missing.
Action(s) to take:
^ INSPECT the valve or valve stem seal.
Possible Source(s):
^ Oil leakage.
Action(s) to take:
^ REPAIR oil leakage.
Possible Source(s):
^ Valve stem or valve guide worn.
Action(s) to take:
^ INSPECT the valve stem or valve guide.
Possible Source(s):
^ Incorrect oil viscosity.
Action(s) to take:
^ DRAIN and FILL with new oil.
Possible Source(s):
^ Diluted oil.
Action(s) to take:
^ CHECK oil dilution. DRAIN and FILL as necessary.
Possible Source(s):
^ Crankcase overfilled.
Action(s) to take:
^ CHECK and adjust the oil level.
Possible Source(s):
^ Incorrect oil pressure.
Action(s) to take:
^ CHECK the oil pressure. REPAIR as necessary.
Engine noise
Possible Source(s):
^ Excessive crankshaft main bearing clearance.
Action(s) to take:
^ INSTALL a new engine.
Possible Source(s):
^ Excessive crankshaft end play.
Action(s) to take:
^ INSTALL a new engine.
Possible Source(s):
^ Excessive connecting rod bearing oil clearance.
Action(s) to take:
^ INSTALL a new engine.
Possible Source(s):
^ Piston/cylinder worn.
Action(s) to take:
^ INSTALL a new engine.
Possible Source(s):
^ Piston ring damaged.
Action(s) to take:
^ INSTALL a new engine.
Possible Source(s):
^ Connecting rod bent.
Action(s) to take:
^ INSTALL a new engine.
Possible Source(s):
^ Valve spring(s) broken.
Action(s) to take:
^ INSPECT the valve spring(s).
Possible Source(s):
^ Excessive valve guide clearance.
Action(s) to take:
^ INSPECT the valve guide or valve.
Possible Source(s):
^ Cooling system inoperative (water pump, vibration of radiator),
Action(s) to take:
^ Refer to Cooling System.
Possible Source(s):
^ Fuel system inoperative.
Action(s) to take:
^ Refer to Fuel Delivery and Air Induction.
Possible Source(s):
^ Excessive carbon buildup.
Action(s) to take:
^ ELIMINATE carbon buildup.
Possible Source(s):
^ Exhaust gas leakage.
Action(s) to take:
^ REPAIR leakage. Refer to Exhaust System.
Possible Source(s):
^ Incorrect drive belt tension.
Action(s) to take:
^ INSPECT the drive belt tension. Refer to Drive Belts, Mounts, Brackets and Accessories.
Possible Source(s):
^ Generator front bearing worn.
Action(s) to take:
^ Refer to Alternator.
Tappet noise, engine running
Possible Source(s):
^ Incorrect tappet clearance.
Action(s) to take:
^ CHECK and ADJUST the tappet clearance as necessary.