4.2 Hard to start
Check fault
codes
Determine fault source upon fault
codes
Check if air intake system
vacuum leakage or intake
valve dirt
1 Hose connection
2 throttle valve body air intake
valve
3 PCV hose
check if ignition system fault
1 wire
2 ignition coil
3 spark
1 Remove fuel injector
connector on each cylinder
2 keep the spark plug about 8mm
away from cylinder body. Start
motor and watch firing. A strong
fire should be visible
Watching firing of each cylinder and check spark and spark plug gap
Spark plug gap: 1mm
Note: If necessary, measure compression pressure and air valve gap
1 fuel injector leakage or short
2 fuel injector wire short
3 over fuel injection
Check fuel supply:
1 if fuel tank is empty
2 fuel supply pipe fuel pressure. When ignition key is
turned to ON position, the pump should operate 1~2
seconds.
Listening pump operating sound in fuel tank;
Feeling pressure in fuel return pipe.
1 fuel circuit leakage or
deformation
2 fuse
3 pump relay
4 fuel pump
5 fuel pump filter
6 fuel pressure
regulator
7 fuel injector
Check idle step motor
1 idle motor mount screw
2 when ignition is turned on, short
vibration should be felt.
1 replace or turn mount
screw
2 step motor connection
3 step motor
Check circuit
Using voltmeter or
oscilloscope
1circuit connection
2 ECU voltage
Fusible link
Fuse
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