Suzuki RA410, Manual

Page: 257 / 761

ENGINE 6-13
Condition Possible Cause Reference Item
Excessive detona-
tion
(The engine makes
sharp metallic
knocks that change
with throttle open-
ing.
Sounds like pop
corn popping.) Engine overheating
Ignition system out of order
•
Faulty spark plug
•
Improper ignition timing
Fuel system out of order
•
Clogged fuel filter and fuel lines
•
Air inhaling from intake mainfold or throttle
body gasket.
Engine and emission control system
Refer to Overheating condition in this table.
Spark plugs in SECTION 6F1.
Ignition timing in SECTION 6F1.
Fuel pressure check in SECTION 6E1.
g y
out of order
•
Faulty EGR system (if equipped)
•
Faulty ECT sensor or MAP sensor
•
Faulty injector
•
Faulty ECM/PCM
Others
•
Excessive deposits in combustion chamber
•
Faulty knock sensor
Diag. Flow Table B-5 in SECTION 6E1.
ECT sensor or MAP sensor in SECTION
6E1.
Fuel injector in SECTION 6E1.
Inspection of ECM/PCM and its circuit in
SECTION 6E1.
Piston and cylinder head cleaning
in SECTION 6A4.
Knock sensor in SECTION 6E1.
Overheating
•
Inoperative thermostat
•
Poor water pump performance
•
Clogged or leaky radiator
•
Improper engine oil grade
•
Clogged oil filter or oil strainer
•
Poor oil pump performance
•
Dragging brakes
•
Slipping clutch
•
Blown cylinder head gasket
•
Faulty radiator fan-control system
Thermostat in SECTION 6B.
Water pump in SECTION 6B.
Radiator in SECTION 6B.
Engine oil and oil filter change in
SECTION 0B.
Oil pressure check in SECTION 6A4.
Oil pressure check in SECTION 6A4.
Diagnosis in SECTION 5.
Diagnosis in SECTION 7C.
Cylinder head inspection in SECTION 6A4.
Diag. Flow Table B-7 in SECTION 6E1.
Poor gasoline
mileage Ignition system out of order
•
Faulty spark plug (improper gap, heavy
deposits, and burned electrodes, etc.)
•
Leaky or loosely connected high-tension
cord
•
Cracked rotor or cap in distributor
Engine and emission control system out
of order
•
Fuel pressure out of specification
•
Faulty TP sensor, ECT sensor or MAP
sensor
•
Faulty EGR system (if equipped)
•
Faulty injector
•
Faulty ECM/PCM
Low compression
Others
•
Poor valve seating
•
Dragging brakes
•
Slipping clutch
•
Thermostat out of order
•
Improper tire pressure
Spark plugs in SECTION 6F1.
High-tension cords in SECTION 6F1.
Distributor in SECTION 6F1.
Diag. Flow Table B-3 in SECTION 6E1.
TP sensor, ECT sensor or MAP sensor in
SECTION 6E1.
Diag. Flow Table B-5 in SECTION 6E1.
Fuel injector in SECTION 6E1.
Inspection of ECM/PCM and its circuit in
SECTION 6E1.
Previously outlined.
Valve inspection in SECTION 6A4.
Diagnosis in SECTION 5.
Diagnosis in SECTION 7C.
Thermostat in SECTION 6B.