MARUTI SUZUKI Wagon R, Manual, Page: 80 / 240

1A-43 Engine General Information and Diagnosis: Bi-Fuel LPG model
Excessive detonation –
Engine makes
continuously sharp
metallic knocks that
change with throttle
opening. Sounds like
popcorn popping Faulty spark plug “Spark Plug Inspection”: in Section
Engine overheating Condition “Engine overheating”
Clogged petrol fuel filter (faulty fuel
pump) or petrol fuel lines “Fuel Line On-Vehicle Inspection”: LPG in
Section 1G or “Fuel Pump and Its Circuit
Check”: LPG in Section 1G
Clogged LPG fuel filter (faulty fuel
pump) or LPG fuel lines “Fuel Line On-Vehicle Inspection”: LPG in
Section 1G
Air drawn in through intake manifold or
throttle body gasket Check air intake system.
Poor performance of knock sensor, ECT
sensor or MAP sensor “Knock Sensor Inspection”: in Section , “ECT
Sensor Inspection”: in Section or “MAP
Sensor Inspection”: in Section
Faulty petrol fuel injector(s) and/or LPG
fuel injector(s) “Fuel Injector Circuit Check”: in Section
Faulty ECM “Inspection of ECM and Its Circuit”: Bi-Fuel
LPG model
Faulty LPG control module “Inspection of LPG Control Module and Its
Circuit”: Bi-Fuel LPG model
Excessive combustion chamber
deposits “Cylinder Head Inspection”: in Section and
“Cylinder, Piston and Piston Ring Inspection”:
in Section
Petrol fuel pressure out of specification
– Dirty petrol fuel filter
– Dirty or clogged petrol fuel hose or
pipe
– Faulty petrol fuel pressure regulator
– Faulty fuel pump “Fuel Pressure Check”: LPG in Section 1G
LPG fuel pressure out of specification
– Dirty LPG fuel filter
– Dirty or clogged LPG fuel hose or pipe
– Faulty LPG pressure regulator “Fuel Pressure Check”: LPG in Section 1G
Engine has no power Faulty spark plug “Spark Plug Inspection”: in Section
Faulty ignition coil with ignitor “Ignition Coil Assembly Inspection”: in Section
Faulty knock sensor “Knock Sensor Inspection”: in Section
Clogged petrol and/or LPG fuel hose or
pipe “Fuel Line On-Vehicle Inspection”: LPG in
Section 1G
Malfunctioning fuel pump “Fuel Pump and Its Circuit Check”: LPG in
Section 1G
Air drawn in through intake manifold
gasket or throttle body gasket Check air intake system.
Engine overheating Condition “Engine overheating”
Poor performance of ECT sensor or
MAP sensor “ECT Sensor Inspection”: in Section or “MAP
Sensor Inspection”: in Section
Faulty throttle body assembly “Throttle Body On-Vehicle Inspection”: in
Section
Faulty petrol fuel injector(s) and/or LPG
fuel injector(s) “Fuel Injector Circuit Check”: in Section
Faulty ECM “Inspection of ECM and Its Circuit”: Bi-Fuel
LPG model
Faulty LPG control module “Inspection of LPG Control Module and Its
Circuit”: Bi-Fuel LPG model
Dragging brakes “Brakes Symptom Diagnosis”: in Section
Slipping clutch “Clutch System Symptom Diagnosis”: in
Section 5C
Low compression “Compression Check”: in Section
Condition Possible cause Correction / Reference Item