4.3 Rough Idle
Check fault code
determine fault source upon fault
code
Check air intake system
vacuum leakage, air intake
valve dirt
1 Hose connection
2 throttle valve body air intake
valve
3 intake manifold mounting
Check air filter core
Wash or replace
Check ignition system fault
1 check if wire power leakage
2 check if ignition coil breakage
or damage
1 check high-tension
wire
2 check ignition coil
Watch firing of each
cylinder and check spark
plug and spark plug gap
Plug gap: 8mm
NOTE: if necessary,
check compression
pressure and air valve
gap
1 replace spark plug
2 cylinder compression
pressure
3 air valve gap
Throttle valve position
sensor and connection,
repair or replace as
necessary
Check throttle valve position
sensor
Check step motor fault
1 check mounting
screw
2 short vibration
should be felt when
ignition turned on
1 measure step motor coil
resistance
2 check step motor wire
3 replace or turn idle motor
mounting screw
Check fuel circuit fuel
pressure
1 check fuel pressure regulator
2 check fuel pump
3 check fuel filter, repair or replace as
necessary
To Next Page
