Suzuki SX4 Service Manual page 98

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1A-48 Engine General Information and Diagnosis:
Condition
Excessive engine oil
consumption – Oil
entering combustion
chamber
Engine hesitates –
Momentary lack of
response as accelerator
is depressed. Can occur
at all vehicle speeds.
Usually most severe when
first trying to make
vehicle move, as from a
stop sign.
Surge – Engine power
variation under steady
throttle or cruise. Feels
like vehicle speeds up
and down with no change
in accelerator pedal.
Possible cause
Sticky piston ring
Worn piston and cylinder
Worn piston ring groove and ring
Improper location of piston ring gap
Worn or damaged valve stem seal
Worn valve stem
Spark plug faulty or plug gap out of
adjustment
Leaky high-tension cord
Fuel pressure out of specification
Malfunctioning EGR valve
Poor performance of ECT sensor or
MAF sensor
Faulty electric throttle body assembly
Faulty APP sensor assembly
Faulty fuel injector
Faulty ECM
Engine overheating
Low compression
Camshaft position control (VVT) system
out of order (for engine with VVT
system)
Leaky or loosely connected high-tension
cord
Faulty spark plug (excess carbon
deposits, improper gap, burned
electrodes, etc.)
Variable fuel pressure
Kinky or damaged fuel hose and lines
Faulty fuel pump (clogged fuel filter)
Malfunctioning EGR valve
Poor performance of MAF sensor
Faulty fuel injector
Faulty ECM
Faulty electric throttle body assembly
Faulty APP sensor assembly
Correction / Reference Item
"Cylinders, Pistons and Piston Rings
Inspection in Section 1D"
"Cylinders, Pistons and Piston Rings
Inspection in Section 1D"
"Cylinders, Pistons and Piston Rings
Inspection in Section 1D"
"Pistons, Piston Rings, Connecting Rods and
Cylinders Disassembly and Assembly in
Section 1D"
"Valves and Valve Guides Inspection in
Section 1D"
"Valves and Valve Guides Inspection in
Section 1D"
"Spark Plug Inspection in Section 1H"
"High-Tension Cord Inspection in Section 1H"
"Fuel Pressure Check"
"EGR Valve Inspection (If Equipped) in Section
1B"
, "Engine Coolant Temperature (ECT) Sensor
Inspection in Section 1C" or "Intake Air
Temperature (IAT) Sensor Inspection in
Section 1C"
"Electric Throttle Body Assembly On-Vehicle
Inspection in Section 1C"
"Accelerator Pedal Position (APP) Sensor
Assembly Inspection in Section 1C"
"Fuel Injector Circuit Check"
Condition "Engine overheating"
"Compression Check in Section 1D"
"Oil Control Valve Inspection (For Engine with
VVT) in Section 1D"
"High-Tension Cord Removal and Installation
in Section 1H"
"Spark Plug Inspection in Section 1H"
"Fuel Pressure Check"
"EGR Valve Inspection (If Equipped) in Section
1B"
"Intake Air Temperature (IAT) Sensor
Inspection in Section 1C"
"Fuel Injector Circuit Check"
"Electric Throttle Body Assembly On-Vehicle
Inspection in Section 1C"
"Accelerator Pedal Position (APP) Sensor
Assembly Inspection in Section 1C"

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