Filter
Top Products
APPENDIX 17-21
Troubleshooting Guide
Air cleaner duct loose
Compression low:
Spark p
lug loose
Cylinder head not sufficiently tightened
down
No valv
e clearance
Cylinder, piston worn
Piston ring bad (worn, weak, broken, or
sticki
ng)
Piston ring/groove clearance excessive
Cylinder head warped
Cylinde
r head gasket damaged
Valvespringbrokenorweak
Valve not seating properly (valve bent,
worn, or
carbon accumulation on the
seating surface)
Other:
IC ignit
er in ECU trouble
Throttle body assy not synchronizing
Engine oil viscosity too high
Drive tr
ain trouble
Brake dragging
Air suction valve trouble
Vacuum sw
itch valve trouble
Engine overheating
Clutch slipping
Poor Running or No Power at High
Speed:
Firing incorrect:
Spark plug dirty, broken, or maladjusted
Stick coil wiring trouble
Stick coil not in good contact
Spark plug incorrect
Camshaft postion trouble
IC igniter in ECU trouble
Crankshaft sensor trouble
Stick coil trouble
Fuel/air mixture incorrect:
Air cleaner clogged, poorly sealed, or miss-
ing
Air cleaner O-ring damaged
Air cleaner duct loose
Water or foreign matter in fuel
Throttle body assy holder loose
Fuel to injector insufficient (DFI)
Fuel tank air vent obstructed
Fuel line clogged
Fuel pump trouble (DFI)
Compression low:
Spark plug loose
Cylinder head not sufficiently tightened
down
No valve clearance
Cylinder, piston worn
Piston ring bad (worn, weak, broken, or
sticki
ng)
Piston ring/groove clearance excessive
Cylinder head gasket damaged
Cylind
er head warped
Valve spring broken or weak
Valve not seating properly (valve bent,
worn, o
r carbon accumulation on the
seating surface.)
Knocking:
Carbon b
uilt up in combustion chamber
Fuel poor quality or incorrect
Spark plug incorrect
IC ignit
er in ECU trouble
Camshaft position sensor trouble
Crankshaft sensor trouble
Miscell
aneous:
Throttle valve won’t fully open
Brake dragging
Clutch sl
ipping
Engine overheating
Engine oil level too high
Engine oi
l viscosity too high
Drive train trouble
Air suction valve trouble
Vacuum sw
itch valve trouble
Catalytic converter melt down due to muffler
overheating (KLEEN)
Overh eating:
Firing incorrect:
Spark plug dirty, broken, or maladjusted
Spark plug incorrect
IC igniter in ECU trouble