Suzuki Grand Vitara JB416 / JB420. Manual - part 26
1A-53 Engine General Information and Diagnosis:
Excessive engine oil
consumption – Oil
leakage
Blown cylinder head gasket
“Cylinder Head Inspection: For J20 Engine in
Section 1D” or “Cylinder Head Inspection: For
M16A Engine with VVT in Section 1D”
Leaky camshaft oil seals
“Camshaft, Tappet and Shim Inspection: For
J20 Engine in Section 1D” or “Camshaft,
Tappet and Shim Inspection: For M16A Engine
with VVT in Section 1D”
Excessive engine oil
consumption – Oil
entering combustion
chamber
Sticky piston ring
“Pistons, Piston Rings, Connecting Rods and
Cylinders Inspection and Cleaning: For J20
Engine in Section 1D” or “Cylinders, Pistons
and Piston Rings Inspection: For M16A Engine
with VVT in Section 1D”
Worn piston and cylinder
“Pistons, Piston Rings, Connecting Rods and
Cylinders Inspection and Cleaning: For J20
Engine in Section 1D” or “Cylinders, Pistons
and Piston Rings Inspection: For M16A Engine
with VVT in Section 1D”
Worn piston ring groove and ring
“Pistons, Piston Rings, Connecting Rods and
Cylinders Inspection and Cleaning: For J20
Engine in Section 1D” or “Cylinders, Pistons
and Piston Rings Inspection: For M16A Engine
with VVT in Section 1D”
Improper location of piston ring gap
“Pistons, Piston Rings, Connecting Rods and
Cylinders Disassembly and Assembly: For J20
Engine in Section 1D” or “Pistons, Piston
Rings, Connecting Rods and Cylinders
Disassembly and Assembly: For M16A Engine
with VVT in Section 1D”
Worn or damaged valve stem seal
“Valves and Valve Guides Inspection: For J20
Engine in Section 1D” or “Valves and Valve
Guides Inspection: For M16A Engine with VVT
in Section 1D”
Worn valve stem
“Valves and Valve Guides Inspection: For J20
Engine in Section 1D” or “Valves and Valve
Guides Inspection: For M16A Engine with VVT
in Section 1D”
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
Spark plug faulty or plug gap out of
adjustment
“Spark Plug Inspection in Section 1H”
Leaky high-tension cord (for M16
engine)
“High-Tension Cord Inspection (For M16
Engine) in Section 1H”
Fuel pressure out of specification
Malfunctioning EGR valve
“EGR Valve Inspection in Section 1B”
Poor performance of ECT sensor or
MAF sensor
“Engine Coolant Temperature (ECT) Sensor
Inspection in Section 1C” or “Mass Air Flow
(MAF) and Intake Air Temperature (IAT)
Sensor Inspection in Section 1C”
Faulty electric throttle body assembly
“Electric Throttle Body Assembly On-Vehicle
Inspection in Section 1C”
Faulty accelerator pedal position (APP)
sensor assembly
“Accelerator Pedal Position (APP) Sensor
Assembly Inspection in Section 1C”
Faulty fuel injector
Faulty ECM
Engine overheating
Condition “Engine overheating”
Low compression
“Compression Check: For J20 Engine in
Section 1D” or “Compression Check: For
M16A Engine with VVT in Section 1D”
Camshaft position control (VVT) system
out of order (for M16 engine)
“Oil Control Valve Inspection: For M16A
Engine with VVT in Section 1D”
Condition
Possible cause
Correction / Reference Item