Troubleshooting Guide
Compression low:
Spark plug loose
Cylinder head not sufficiently tightened
down
Cylinder, piston worn
Piston ring bad (worn, weak, broken, or
sticking)
Piston ring/groove clearance excessive
Cylinder head gasket damaged
Cylinder head warped
Valve spring broken or weak
Valve not seating properly (valve bent,
worn, or carbon accumulation on the
seating surface)
Camshaft cam worm
KACR weights open (engine stalls when
moving off)
HLA seizure
Run-on (dieseling):
Ignition switch trouble
Engine stop switch trouble
Fuel injector trouble
Loosen terminal of battery (–) cable or ECU
ground lead
Carbon accumulating on valve seating sur-
face
Engine overheating
Other:
ECU trouble
Engine vacuum not synchronizing
Engine oil viscosity too high
Drive train trouble
Brake dragging
Clutch slipping
Engine overheating
Air suction valve trouble
Air switching valve trouble
Blowby gas system trouble
Poor Running or No Power at High
Speed:
Firing incorrect:
Spark plug dirty, broken, or maladjusted
Spark plug cap or high-tension cable trou-
ble
Spark plug cap shorted or not in good con-
tact
Spark plug incorrect
Ignition coil shorted or not in good contact
trouble
Ignition coil trouble
ECU trouble
Fuel/air mixture incorrect:
Air cleaner clogged, poorly sealed, or miss-
ing
Air cleaner housing loose
Water or foreign matter in fuel
Throttle body assy loose
Fuel to injector insufficient
Fuel tank air vent obstructed
Fuel line clogged
Fuel pump trouble
Compression low:
Spark plug loose
Cylinder head not sufficiently tightened
down
Cylinder, piston worn
Piston ring bad (worn, weak, broken, or
sticking)
Piston ring/groove clearance excessive
Cylinder head gasket damaged
Cylinder head warped
Valve spring broken or weak
Valve not seating properly (valve bent,
worn, or carbon accumulation on the
seating surface.)
KACR weights open (engine stalls when
moving off)
HLA seizure
Knocking:
Carbon built up in combustion chamber
Fuel poor quality or incorrect
Spark plug incorrect
ECU trouble
Miscellaneous:
Throttle valve won't fully open
Brake dragging
Clutch slipping
Engine overheating
Engine oil level too high
Engine oil viscosity too high
Drive train trouble
Camshaft cam worm
Air suction valve trouble
Air switching valve trouble
Catalytic converter melt down due to muffler
overheating (KLEEN)
Overheating:
Firing incorrect:
Spark plug dirty, broken, or maladjusted
Spark plug incorrect
ECU trouble
Muffler overheating:
For KLEEN, do not run the engine even if
with only one cylinder misfiring or poor
running (Request the nearest service fa-
cility to correct it)
For KLEEN, do not push-start with a dead
battery (Connect another full-charged
battery with jumper cables, and start the
engine using the electric starter)
APPENDIX 17-49
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