Engine Hyundai G4CM

The 1.8-liter Hyundai G4CM engine was produced from 1988 to 1998 under license from Mitsubishi, because structurally it was a copy of the popular Japanese company engine with the 4G62 index. This SOHC engine is primarily known as the base powertrain of the Sonata Y2 and Y3 models.

Sirius family: 1.6 L – G4CR; 1.8 L – G4CN, G4CM, G4JN; 2.0 L – G4CP, G4JP; 2.4 L – G4JS, G4CS.

The engine was installed on:

  • Hyundai Sonata 2 (Y2) in 1988 – 1993; Sonata 3 (Y3) in 1993 – 1998.


Production years 1988-1998
Displacement, cc 1795
Fuel system injector
Power output, hp 90 – 100
Torque output, Nm 135 – 145
Cylinder block cast iron R4
Block head aluminum 8v
Cylinder bore, mm 80.6
Piston stroke, mm 88
Compression ratio 8.8 – 8.9
Features no
Hydraulic lifters yes
Timing drive belt
Phase regulator no
Turbocharging no
Recommended engine oil 10W-40
Engine oil capacity, liter 3.7
Fuel type petrol
Euro standards EURO 1/2
Fuel consumption, L/100 km (for Hyundai Sonata 1990)
— city
— highway
— combined
Engine lifespan, km ~300 000
Weight, kg 149.1 (without attachments)

Disadvantages of the Hyundai G4CM engine

  • A strong clatter under the hood is a sign of failure of the hydraulic lifters;
  • Vibration of the power unit indicates critical wear of one of the engine mounts;
  • Floating engine speeds are often caused by contamination of the injectors, throttle and idle speed controller;
  • However, these are all trifles, the main thing here is to monitor the condition of the belts: timing and balancers;
  • After all, the breakage of any of them almost always turns into a meeting of pistons with valves.

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