ENGINE TROUBLE IN GENERAL
Mechanical
21. Engine Trouble in General
S183095
A: INSPECTION
S183095A10
NOTE:
"RANK" shown in the chart refer to the possibility of reason for the trouble in order ("Very often" to "Rarely")
A — Very often
? — Sometimes
? — Rarely
TROUBLE
PROBLEM PARTS, ETC.
POSSIBLE CAUSE
RANK
1. Engine will not start.
1) Starter does not turn.
• Starter
• Defective battery-to-starter harness
?
• Defective starter switch
?
• Defective inhibitor switch or neutral switch
?
• Defective starter
?
• Battery
• Poor terminal connection
?
• Run-down battery
?
• Defective charging system
?
• Friction
• Seizure of crankshaft and connecting rod bearing
?
• Seized camshaft
?
• Seized or stuck piston and cylinder
?
2) Initial combustion does
• Starter
• Defective starter
?
not occur.
• Engine control system <Ref. to EN(DOHC TURBO)-2, Basic Diagnostic Proce­dure.>
?
• Fuel line
• Defective fuel pump and relay
?
• Lack of or insufficient fuel
?
• Belt
• Defective
?
• Defective timing
?
• Compression
• Incorrect valve clearance
?
• Loosened spark plugs or defective gasket
?
• Loosened cylinder head bolts or defective gasket
?
• Improper valve seating
?
• Defective valve stem
?
• Worn or broken valve spring
?
• Worn or stuck piston rings, cylinder and piston
?
• Incorrect valve timing
?
• Improper engine oil (low viscosity)
?
ME(DOHC TURBO)-91
ENGINE TROUBLE IN GENERAL
Mechanical
TROUBLE
PROBLEM PARTS, ETC.
POSSIBLE CAUSE
RANK
3) Initial combustion occur.
• Engine control system <Ref. to EN(DOHC TURBO)-2, Basic Diagnostic Proce­dure.>
A
• Intake system
• Defective intake manifold gasket
?
• Defective throttle body gasket
?
• Fuel line
• Defective fuel pump and relay
?
• Clogged fuel line
?
• Lack of or insufficient fuel
?
• Belt
• Defective
?
• Defective timing
?
• Compression
• Incorrect valve clearance
?
• Loosened spark plugs or defective gasket
?
• Loosened cylinder head bolts or defective gasket
?
• Improper valve seating
?
• Defective valve stem
?
• Worn or broken valve spring
?
• Worn or stuck piston rings, cylinder and piston
?
• Incorrect valve timing
?
• Improper engine oil (low viscosity)
?
4) Engine stalls after initial combustion.
• Engine control system <Ref. to EN(DOHC TURBO)-2, Basic Diagnostic Proce­dure.>
?
• Intake system
• Loosened or cracked intake duct
?
• Loosened or cracked PCV hose
?
• Loosened or cracked vacuum hose
?
• Defective intake manifold gasket
?
• Defective throttle body gasket
?
• Dirty air cleaner element
?
• Fuel line
• Clogged fuel line
?
• Lack of or insufficient fuel
?
• Belt
• Defective
?
• Defective timing
?
• Compression
• Incorrect valve clearance
?
• Loosened spark plugs or defective gasket
?
• Loosened cylinder head bolts or defective gasket
?
• Improper valve seating
?
• Defective valve stem
?
• Worn or broken valve spring
?
• Worn or stuck piston rings, cylinder and piston
?
• Incorrect valve timing
?
• Improper engine oil (low viscosity)
?
ME(DOHC TURBO)-92
ENGINE TROUBLE IN GENERAL
Mechanical
TROUBLE
PROBLEM PARTS, ETC.
POSSIBLE CAUSE
RANK
2. Rough idle and engine stall
• Engine control system <Ref. to EN(DOHC TURBO)-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
?
• Defective throttle body gasket
?
• Defective PCV valve
?
• Loosened oil filler cap
?
• Dirty air cleaner element
?
• Fuel line
• Defective fuel pump and relay
?
• Clogged fuel line
?
• Lack of or insufficient fuel
?
• Belt
• Defective timing
?
• Compression
• Incorrect valve clearance
?
• Loosened spark plugs or defective gasket
?
• Loosened cylinder head bolts or defective gasket
?
• Improper valve seating
?
• Defective valve stem
?
• Worn or broken valve spring
?
• Worn or stuck piston rings, cylinder and piston
?
• Incorrect valve timing
?
• Improper engine oil (low viscosity)
?
• Lubrication system
• Incorrect oil pressure
?
• Defective rocker cover gasket
?
• Cooling system
• Overheating
?
• Others
• Malfunction of evaporative emission control system
?
• Stuck or damaged throttle valve
?
• Accelerator cable out of adjustment
?
ME(DOHC TURBO)-93
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(DOHC TURBO)-2, Basic Diagnostic Proce­dure.>
A
• Intake system
• Loosened or cracked intake duct
A
• Loosened or cracked PCV hose
A
• Loosened or cracked vacuum hose
?
• Defective intake manifold gasket
?
• Defective throttle body gasket
?
• Defective PCV valve
?
• Loosened oil filler cap
?
• Dirty air cleaner element
?
• Fuel line
• Defective fuel pump and relay
?
• Clogged fuel line
?
• Lack of or insufficient fuel
?
• Belt
• Defective timing
?
• Compression
• Incorrect valve clearance
?
• Loosened spark plugs or defective gasket
?
• Loosened cylinder head bolts or defective gasket
?
• Improper valve seating
?
• Defective valve stem
?
• Worn or broken valve spring
?
• Worn or stuck piston rings, cylinder and piston
?
• Incorrect valve timing
?
• Improper engine oil (low viscosity)
?
• Lubrication system
• Incorrect oil pressure
?
• Cooling system
• Overheating
?
• Over cooling
?
• Others
• Malfunction of evaporative emission control system
?
4. Surging
• Engine control system <Ref. to EN(DOHC TURBO)-2, Basic Diagnostic Proce­dure.>
?
• Intake system
• Loosened or cracked intake duct
?
• Loosened or cracked PCV hose
?
• Loosened or cracked vacuum hose
?
• Defective intake manifold gasket
?
• Defective throttle body gasket
?
• Defective PCV valve
?
• Loosened oil filler cap
?
• Dirty air cleaner element
?
• Fuel line
• Defective fuel pump and relay
?
• Clogged fuel line
?
• Lack of or insufficient fuel
?
• Belt
• Defective timing
?
• Compression
• Incorrect valve clearance
?
• Loosened spark plugs or defective gasket
?
• Loosened cylinder head bolts or defective gasket
?
• Improper valve seating
?
• Defective valve stem
?
• Worn or broken valve spring
?
• Worn or stuck piston rings, cylinder and piston
?
• Incorrect valve timing
?
• Improper engine oil (low viscosity)
?
• Cooling system
• Overheating
?
• Others
• Malfunction of evaporative emission control system
?
ME(DOHC TURBO)-94
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(DOHC TURBO)-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
?
6. Dieseling (Run-on)
• Engine control system <Ref. to EN(DOHC TURBO)-2, Basic Diagnostic Proce­dure.>
A
• Cooling system
• Overheating
?
• Others
• Malfunction of evaporative emission control system
?
7. After burning in exhaust system
• Engine control system <Ref. to EN(DOHC TURBO)-2, Basic Diagnostic Proce­dure.>
A
• Intake system
• Loosened or cracked intake duct
?
• Loosened or cracked PCV hose
?
• Loosened or cracked vacuum hose
?
• Defective PCV valve
?
• Loosened oil filler cap
?
• Belt
• Defective timing
?
• Compression
• Incorrect valve clearance
?
• Loosened spark plugs or defective gasket
?
• Loosened cylinder head bolts or defective gasket
?
• Improper valve seating
?
• Defective valve stem
?
• Worn or broken valve spring
?
• Worn or stuck piston rings, cylinder and piston
?
• Incorrect valve timing
?
• Lubrication system
• Incorrect oil pressure
?
• Cooling system
• Over cooling
?
• Others
• Malfunction of evaporative emission control system
?
8. Knocking
• Engine control system <Ref. to EN(DOHC TURBO)-2, Basic Diagnostic Proce­dure.>
?
• Intake system
• Loosened oil filler cap
?
• Belt
• Defective timing
?
• Compression
• Incorrect valve clearance
?
• Incorrect valve timing
?
• Cooling system
• Overheating
?
9. Excessive engine oil con­sumption
• Intake system
• Loosened or cracked PCV hose
?
• Defective PCV valve
?
• Loosened oil filler cap
?
• Compression
• Defective valve stem
?
• Worn or stuck piston rings, cylinder and piston
?
• Lubrication system
• Loosened oil pump attaching bolts and defective gasket
?
• Defective oil filter seal
?
• Defective crankshaft oil seal
?
• Defective rocker cover gasket
?
• Loosened oil drain plug or defective gasket
?
• Loosened oil pan fitting bolts or defective oil pan
?
ME(DOHC TURBO)-95
ENGINE TROUBLE IN GENERAL
Mechanical
TROUBLE
PROBLEM PARTS, ETC.
POSSIBLE CAUSE
RANK
10. Excessive fuel consump­tion
• Engine control system <Ref. to EN(DOHC TURBO)-2, Basic Diagnostic Proce­dure.>
A
• Intake system
• Dirty air cleaner element
A
• Belt
• Defective timing
?
• Compression
• Incorrect valve clearance
?
• Loosened spark plugs or defective gasket
?
• Loosened cylinder head bolts or defective gasket
?
• Improper valve seating
?
• Defective valve stem
?
• Worn or broken valve spring
?
• Worn or stuck piston rings, cylinder and piston
?
• Incorrect valve timing
?
• Lubrication system
• Incorrect oil pressure
?
• Cooling system
• Over cooling
?
• Others
• Accelerator cable out of adjustment
?
ME(DOHC TURBO)-96