Engine hesitation is caused by faulty piston ring or faulty valve system. The purpose of the Inspection is to analyze the cause of hesitation through wet type compression pressure Inspection.
Warm up and stop engine.
Allow the engine to warm up to normal operating temperature.
Remove the surge tank.
Remove the ignition coil connectors and ignition coils.
Using a 16mm plug wrench, remove the 6 spark plugs.
Check cylinder compression pressure.
1) Insert a compression gauge into the spark plug hole.
2) Fully open the throttle.
3) While cranking the engine, measure the compression pressure.
4) Repeat steps (a) through (c) for each cylinder.
Compression pressure Specification :
Standard : 1,176.79 kPa [12.0 kgf/㎠, 170.68 psi] (200 ∼ 250 rpm)
Minimum : 1,029.69 kPa [10.5 kgf/㎠, 149.34 psi]
Difference between each cylinder : 98.07 kPa [1.0 kgf/㎠, 14.22 psi] or less
Is the compression pressure normal?
YES
Compression pressure is OK.
NO
Go to "Wet type compression pressure Inspection" procedure as below.
IG "OFF"
Inject engine oil about 10cc to the cylinder.
Measure compression pressure when cylinder is wet.
Is compression pressure increased?
YES
Disassemble and repair the piston rings and/or cylinder bore.
NO
Disassemble and repair the valve system.
* If compression pressure is low after wet type compression Inspection, Most fault is head gasket problem.
