Suzuki Ignis Service Manual page 3229

6-28 ENGINE GENERAL INFORMATION AND DIAGNOSIS
Condition
Surge
(Engine power vari-
ation under steady
throttle or cruise.
Feels like vehicle
speeds up and
down with no
change in accelera-
tor pedal.)
Excessive detona-
tion
(Engine makes con-
tinuously sharp
metallic knocks that
change with throttle
opening. Sounds
like pop corn pop-
ping.)
Possible Cause
Leaky or loosely connected high-tension cord "High-Tension Cords Removal and
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)
Malfunctioning EGR valve
Poor performance of MAF sensor
Faulty fuel injector
Faulty ECM
Faulty spark plug
Loose connection of high-tension cord
Engine overheating
Clogged fuel filter (faulty fuel pump) or fuel
lines
Air inhaling from intake manifold or throttle
body O-ring
Malfunctioning EGR valve
Poor performance of knock sensor, ECT sen-
sor or MAF sensor
Faulty fuel injector(s)
Faulty ECM
Excessive combustion chamber deposits
VVT system out of order
Reference Item
Installation" in Section 6F1.
"Spark Plugs Removal and Installation"
in Section 6F1.
"Table B-3 Fuel Pressure Check" in this
section.
"EGR valve inspection" in Section 6E1.
"Mass air flow (MAF) and intake air
temperature (IAT) sensor inspection" in
Section 6E1.
"Table B-1 Fuel Injector Circuit Check"
in this section.
"Spark Plugs Removal and Installation"
in Section 6F1.
"High-Tension Cords Removal and
Installation" in Section 6F1.
"Overheating" in this table.
"Table B-1 Fuel Injector Circuit Check"
or "Table B-2 Fuel Pump and Its Circuit
Check" in this section.
"EGR valve inspection" in Section 6E1.
"DTC P0325 Flow Table" in this sec-
tion, "Engine coolant temperature sen-
sor (ECT sensor) inspection" or "Mass
air flow (MAF) and intake air tempera-
ture (IAT) sensor inspection" in Section
6E1.
"Table B-1 Fuel Injector Circuit Check"
in this section.
"Pistons, Piston Rings, Connecting
Rods and Cylinders Components" in
Section 6A1.
"Diagnostic Flow Table B-10" in this
section or "Oil control valve inspection"
in Section 6E1.