Suzuki Liana RH418 Supplementary Service Manual page 45

Condition
Surge – Engine power
variation under steady
throttle or cruise. Feels
like vehicle speeds up
and down with no change
in accelerator pedal.
Excessive detonation –
Engine makes
continuously sharp
metallic knocks that
change with throttle
opening. Sounds like pop
corn popping.
Possible cause
Leaky or loosely connected high-tension
cord
Faulty spark plug (excess carbon
deposits, improper gap, and burned
electrodes, etc.)
Variable fuel pressure
Kinky or damaged fuel hose and lines
Faulty fuel pump (clogged fuel filter)
Poor performance of MAP sensor
Faulty fuel injector
Faulty ECM
Faulty spark plug
Loose connection of high-tension cord
Clogged fuel filter (faulty fuel pump) or
fuel lines
Air inhaling from intake manifold or
throttle body gasket
Poor performance of knock sensor, ECT
sensor or MAP sensor
Faulty fuel injector(s)
Faulty ECM
Excessive combustion chamber
deposits
Camshaft position control system out of
order
Engine General Information and Diagnosis:
Correction / Reference Item
"High-Tension Cord Inspection in Section 1H in
related manual"
"Spark Plug Inspection in Section 1H in related
manual"
"Fuel Pressure Check"
"Fuel Pressure Check"
"Manifold Absolute Pressure (MAP) Sensor
Inspection in Section 1C in related manual"
"Fuel Injector Inspection in Section 1G"
"Spark Plug Inspection in Section 1H in related
manual"
"High-Tension Cord Inspection in Section 1H in
related manual"
"Fuel Pressure Check"
"Engine Coolant Temperature (ECT) Sensor
Inspection in Section 1C in related manual" or
"Manifold Absolute Pressure (MAP) Sensor
Inspection in Section 1C in related manual"
"Fuel Injector Inspection in Section 1G"
Clean.
"Oil Control Valve Inspection in Section 1C"
1A-32