Suzuki Swift Sport 2004 Service & Repair Manual page 94

1A-44 Engine General Information and Diagnosis:
Condition
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.
Excessive detonation –
Engine makes
continuously sharp
metallic knocks that
change with throttle
opening. Sounds like pop
corn popping.
Possible cause
Spark plug faulty
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
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 electric throttle body assembly
Faulty APP sensor assembly
Faulty ECM
Faulty spark plug
Loose connection of high-tension cord
Engine overheating
Clogged fuel filter (faulty fuel pump) or
fuel lines
Air drawn in through intake manifold or
throttle body gasket
Malfunctioning EGR valve
Poor performance of knock sensor, ECT
sensor or MAF sensor
Faulty fuel injector(s)
Faulty ECM
Excessive combustion chamber
deposits
Camshaft position control (VVT) system
out of order
Correction / Reference Item
"Spark Plug Inspection in Section 1H"
"High-Tension Cord Inspection in Section 1H"
"Fuel Pressure Check"
"EGR Valve Inspection in Section 1B"
"ECT Sensor Inspection in Section 1C" or
"MAF and IAT Sensor Inspection in Section
1C"
"Electric Throttle Body Assembly On-Vehicle
Inspection in Section 1C"
"APP Sensor Assembly Inspection in Section
1C"
"Fuel Injector Circuit Check"
Condition "Engine overheating"
"Compression Check in Section 1D"
"Oil Control Valve Inspection in Section 1D"
"High-Tension Cord Removal and Installation
in Section 1H"
"Spark Plug Inspection in Section 1H"
"Fuel Pressure Check"
"EGR Valve Inspection in Section 1B"
"MAF and IAT Sensor Inspection in Section
1C"
"Fuel Injector Circuit Check"
"Electric Throttle Body Assembly On-Vehicle
Inspection in Section 1C"
"APP Sensor Assembly Inspection in Section
1C"
"Spark Plug Inspection in Section 1H"
"High-Tension Cord Removal and Installation
in Section 1H"
Condition "Engine overheating"
"Fuel Pressure Check" or "Fuel Pump and Its
Circuit Check"
"EGR Valve Inspection in Section 1B"
"DTC P0327 / P0328: Knock Sensor 1 Circuit
Low / High", "ECT Sensor Inspection in
Section 1C" or "MAF and IAT Sensor
Inspection in Section 1C"
"Fuel Injector Circuit Check"
"Cylinders, Pistons and Piston Rings
Inspection in Section 1D" and/or "Piston Pins
and Connecting Rods Inspection in Section
1D"
"Oil Control Valve Inspection in Section 1D"