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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
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