Hisun HS700UTV-4 - Compression System; Poor Idle Speed Performance

TROUBLESHOOTING
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Starter motor
1、Faulty starter motor
2、Faulty starter relay
3、Faulty overrunning clutch in engine
4、Broken main switch
5、Broken main fuse
Battery
1、Low battery voltage
2、Faulty battery
COMPRESSION SYSTEM
Cylinder and cylinder head
1、Loose spark plug
2、Loose cylinder head or cylinder
3、Broken cylinder head gasket
4、Broken cylinder gasket
5、Worn, damaged or seized cylinder
Piston and piston rings
1、Improperly installed piston ring
2、Worn, fatigued or broken piston ring
3、Seized piston ring
4、Seized or damaged piston
Valve, camshaft and crankshaft
1、Improperly sealed valve
2、Improperly contacted valve and valve seat
3、Improper valve timing
4、Broken valve spring
5、Seized camshaft
Crankcase and crankshaft
1、Improperly seated crankcase
2、Seized crankshaft
Valve train
1、Improperly adjusted valve clearance
2、Improperly adjusted valve timing
POOR IDLE SPEED PERFORMANCE
POOR IDLE SPEED PERFORMANCE
EFI system
1、Broken ECU
2、Clogged nozzle or the rupture the line from nozzle to ECU
3、Damage of engine speed signal sensor
4、Rupture of the line from engine speed signal sensor to ECU
5、Broken inlet pressure or temperature sensor or damaged line to ECU
6、Broken air throttle or damage line to ECU.
7、Broken vice line (cable) of electrical injection