ENGINE TROUBLE IN GENERAL
Mechanical
22. Engine Trouble in General
S153095
A: INSPECTION
S153095A10
NOTE:
"RANK" shown in the chart refer to the possibility of reason for the trouble in order ("Very often" to "Rarely")
A - Very often
B - Sometimes
C - Rarely
TROUBLE
PROBLEM PARTS, ETC.
POSSIBLE CAUSE
RANK
1. Engine will not start.
1) Starter does not turn.
- Starter
- Defective battery-to-starter harness
B
- Defective starter switch
C
- Defective inhibitor switch or neutral switch
C
- Defective starter
B
- Battery
- Poor terminal connection
A
- Run-down battery
A
- Defective charging system
B
- Friction
- Seizure of crankshaft and connecting rod bearing
C
- Seized camshaft
C
- Seized or stuck piston and cylinder
C
2) Initial combustion does
- Starter
- Defective starter
C
not occur.
- Engine control system <Ref. to EN(SOHC)-2, Basic Diagnostic Procedure.> or <Ref. to EN(SOHCw/oOBD)-2, Basic Diagnostic Procedure.>
A
- Fuel line
- Defective fuel pump and relay
A
- Lack of or insufficient fuel
B
- Belt
- Defective
B
- Defective timing
B
- Compression
- Incorrect valve clearance
C
- Loosened spark plugs or defective gasket
C
- Loosened cylinder head bolts or defective gasket
C
- Improper valve seating
C
- Defective valve stem
C
- Worn or broken valve spring
B
- Worn or stuck piston rings, cylinder and piston
C
- Incorrect valve timing
B
- Improper engine oil (low viscosity)
B
ME(SOHC)-87
ENGINE TROUBLE IN GENERAL
Mechanical
TROUBLE
PROBLEM PARTS, ETC.
POSSIBLE CAUSE
RANK
3) Initial combustion occur.
- Engine control system <Ref. to EN(SOHC)-2, Basic Diagnostic Procedure.> or <Ref. to EN(SOHCw/oOBD)-2, Basic Diagnostic Procedure.>
A
- Intake system
- Defective intake manifold gasket
B
- Defective throttle body gasket
B
- Fuel line
- Defective fuel pump and relay
C
- Clogged fuel line
C
- Lack of or insufficient fuel
B
- Belt
- Defective
B
- Defective timing
B
- Compression
- Incorrect valve clearance
C
- Loosened spark plugs or defective gasket
C
- Loosened cylinder head bolts or defective gasket
C
- Improper valve seating
C
- Defective valve stem
C
- Worn or broken valve spring
B
- Worn or stuck piston rings, cylinder and piston
C
- Incorrect valve timing
B
- Improper engine oil (low viscosity)
B
4) Engine stalls after initial combustion.
- Engine control system <Ref. to EN(SOHC)-2, Basic Diagnostic Procedure.> or <Ref. to EN(SOHCw/oOBD)-2, Basic Diagnostic Procedure.>
A
- Intake system
- Loosened or cracked intake duct
B
- Loosened or cracked PCV hose
C
- Loosened or cracked vacuum hose
C
- Defective intake manifold gasket
B
- Defective throttle body gasket
B
- Dirty air cleaner element
C
- Fuel line
- Clogged fuel line
C
- Lack of or insufficient fuel
B
- Belt
- Defective
B
- Defective timing
B
- Compression
- Incorrect valve clearance
C
- Loosened spark plugs or defective gasket
C
- Loosened cylinder head bolts or defective gasket
C
- Improper valve seating
C
- Defective valve stem
C
- Worn or broken valve spring
B
- Worn or stuck piston rings, cylinder and piston
C
- Incorrect valve timing
B
- Improper engine oil (low viscosity)
B
ME(SOHC)-88
ENGINE TROUBLE IN GENERAL
Mechanical
TROUBLE
PROBLEM PARTS, ETC.
POSSIBLE CAUSE
RANK
2. Rough idle and engine stall
- Engine control system <Ref. to EN(SOHC)-2, Basic Diagnostic Procedure.> or <Ref. to EN(SOHCw/oOBD)-2, Basic Diagnostic Procedure.>
A
- Intake system
- Loosened or cracked intake duct
A
- Loosened or cracked PCV hose
A
- Loosened or cracked vacuum hose
A
- Defective intake manifold gasket
B
- Defective throttle body gasket
B
- Defective PCV valve
C
- Loosened oil filter cap
B
- Dirty air cleaner element
C
- Fuel line
- Defective fuel pump and relay
C
- Clogged fuel line
C
- Lack of or insufficient fuel
B
- Belt
- Defective timing
C
- Compression
- Incorrect valve clearance
B
- Loosened spark plugs or defective gasket
B
- Loosened cylinder head bolts or defective gasket
B
- Improper valve seating
B
- Defective valve stem
C
- Worn or broken valve spring
B
- Worn or stuck piston rings, cylinder and piston
B
- Incorrect valve timing
A
- Improper engine oil (low viscosity)
B
- Lubrication system
- Incorrect oil pressure
B
- Defective rocker cover gasket
C
- Cooling system
- Overheating
C
- Others
- Malfunction of evaporative emission control system
A
- Stuck or damaged throttle valve
B
- Accelerator cable out of adjustment
C
ME(SOHC)-89
ENGINE TROUBLE IN GENERAL
Mechanical
TROUBLE
PROBLEM PARTS, ETC.
POSSIBLE CAUSE
RANK
3. Low output, hesitation and poor acceleration
- Engine control system <Ref. to EN(SOHC)-2, Basic Diagnostic Procedure.> or <Ref. to EN(SOHCw/oOBD)-2, Basic Diagnostic Procedure.>
A
- Intake system
- Loosened or cracked intake duct
A
- Loosened or cracked PCV hose
A
- Loosened or cracked vacuum hose
B
- Defective intake manifold gasket
B
- Defective throttle body gasket
B
- Defective PCV valve
B
- Loosened oil filter cap
B
- Dirty air cleaner element
A
- Fuel line
- Defective fuel pump and relay
B
- Clogged fuel line
B
- Lack of or insufficient fuel
C
- Belt
- Defective timing
B
- Compression
- Incorrect valve clearance
B
- Loosened spark plugs or defective gasket
B
- Loosened cylinder head bolts or defective gasket
B
- Improper valve seating
B
- Defective valve stem
C
- Worn or broken valve spring
B
- Worn or stuck piston rings, cylinder and piston
C
- Incorrect valve timing
A
- Improper engine oil (low viscosity)
B
- Lubrication system
- Incorrect oil pressure
B
- Cooling system
- Overheating
C
- Over cooling
C
- Others
- Malfunction of evaporative emission control system
A
4. Surging
- Engine control system <Ref. to EN(SOHC)-2, Basic Diagnostic Procedure.> or <Ref. to EN(SOHC)-2, Basic Diagnostic Procedure.>
A
- Intake system
- Loosened or cracked intake duct
A
- Loosened or cracked PCV hose
A
- Loosened or cracked vacuum hose
A
- Defective intake manifold gasket
B
- Defective throttle body gasket
B
- Defective PCV valve
B
- Loosened oil filter cap
B
- Dirty air cleaner element
B
- Fuel line
- Defective fuel pump and relay
B
- Clogged fuel line
B
- Lack of or insufficient fuel
C
- Belt
- Defective timing
B
- Compression
- Incorrect valve clearance
B
- Loosened spark plugs or defective gasket
C
- Loosened cylinder head bolts or defective gasket
C
- Improper valve seating
C
- Defective valve stem
C
- Worn or broken valve spring
C
- Worn or stuck piston rings, cylinder and piston
C
- Incorrect valve timing
A
- Improper engine oil (low viscosity)
B
- Cooling system
- Overheating
B
- Others
- Malfunction of evaporative emission control system
C
ME(SOHC)-90
ENGINE TROUBLE IN GENERAL
Mechanical
TROUBLE
PROBLEM PARTS, ETC.
POSSIBLE CAUSE
RANK
5. Engine does not return to idle.
- Engine control system <Ref. to EN(SOHC)-2, Basic Diagnostic Procedure.> or <Ref. to EN(SOHCw/oOBD)-2, Basic Diagnostic Procedure.>
A
- Intake system
- Loosened or cracked vacuum hose
A
- Others
- Stuck or damaged throttle valve
A
- Accelerator cable out of adjustment
B
6. Dieseling (Run-on)
- Engine control system <Ref. to EN(SOHC)-2, Basic Diagnostic Procedure.> or <Ref. to EN(SOHCw/oOBD)-2, Basic Diagnostic Procedure.>
A
- Cooling system
- Overheating
B
- Others
- Malfunction of evaporative emission control system
B
7. After burning in exhaust system
- Engine control system <Ref. to EN(SOHC)-2, Basic Diagnostic Procedure.> or <Ref. to EN(SOHCw/oOBD)-2, Basic Diagnostic Procedure.>
A
- Intake system
- Loosened or cracked intake duct
C
- Loosened or cracked PCV hose
C
- Loosened or cracked vacuum hose
B
- Defective PCV valve
B
- Loosened oil filler cap
C
- Belt
- Defective timing
B
- Compression
- Incorrect valve clearance
B
- Loosened spark plugs or defective gasket
C
- Loosened cylinder head bolts or defective gasket
C
- Improper valve seating
B
- Defective valve stem
C
- Worn or broken valve spring
C
- Worn or stuck piston rings, cylinder and piston
C
- Incorrect valve timing
A
- Lubrication system
- Incorrect oil pressure
C
- Cooling system
- Over cooling
C
- Others
- Malfunction of evaporative emission control system
C
8. Knocking
- Engine control system <Ref. to EN(SOHC)-2, Basic Diagnostic Procedure.> or <Ref. to EN(SOHCw/oOBD)-2, Basic Diagnostic Procedure.>
A
- Intake system
- Loosened oil filter cap
B
- Belt
- Defective timing
B
- Compression
- Incorrect valve clearance
C
- Incorrect valve timing
B
- Cooling system
- Overheating
A
9. Excessive engine oil con­sumption
- Intake system
- Loosened or cracked PCV hose
A
- Defective PCV valve
B
- Loosened oil filter cap
C
- Compression
- Defective valve stem
A
- Worn or stuck piston rings, cylinder and piston
A
- Lubrication system
- Loosened oil pump attaching bolts and defective gasket
B
- Defective oil filter seal
B
- Defective crankshaft oil seal
B
- Defective rocker cover gasket
B
- Loosened oil drain plug or defective gasket
B
- Loosened oil pan fitting bolts or defective oil pan
B
ME(SOHC)-91
ENGINE TROUBLE IN GENERAL
Mechanical
TROUBLE
PROBLEM PARTS, ETC.
POSSIBLE CAUSE
RANK
10. Excessive fuel consump­tion
- Engine control system <Ref. to EN(SOHC)-2, Basic Diagnostic Procedure.> or <Ref. to EN(SOHCw/oOBD)-2, Basic Diagnostic Procedure.>
A
- Intake system
- Dirty air cleaner element
A
- Belt
- Defective timing
B
- Compression
- Incorrect valve clearance
B
- Loosened spark plugs or defective gasket
C
- Loosened cylinder head bolts or defective gasket
C
- Improper valve seating
B
- Defective valve stem
C
- Worn or broken valve spring
C
- Worn or stuck piston rings, cylinder and piston
B
- Incorrect valve timing
B
- Lubrication system
- Incorrect oil pressure
C
- Cooling system
- Over cooling
C
- Others
- Accelerator cable out of adjustment
B
ME(SOHC)-92