Suzuki Liana RH418, Supplementary Service Manual

Page: 45 / 371

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