Engine Audi NF

The 2.3-liter Audi 2.3 NF engine was assembled at the concern’s enterprises from 1986 to 1990 and was installed only on the third generation of a very popular model with an index of 100. After not the biggest upgrade in 1990, this power unit became known as AAR.

The EA828 series includes: RT, KU, NF, NG, AAR, AAN.


Production years 1986-1990
Displacement, cc 2309
Fuel system KE-III-Jetronic
Power output, hp 136
Torque output, Nm 190
Cylinder block cast iron R5
Block head aluminum 10v
Cylinder bore, mm 82.5
Piston stroke, mm 86.4
Compression ratio 10.0
Features SOHC
Hydraulic lifters yes
Timing drive belt
Phase regulator no
Turbocharging no
Recommended engine oil 5W-40
Engine oil capacity, liter 4.5
Fuel type petrol
Euro standards EURO 2
Fuel consumption, L/100 km (for Audi 100 C3 1989)
— city
— highway
— combined
Engine lifespan, km ~340 000

The engine was installed on:

  • Audi 100 C3 (44) in 1986 – 1990.

Disadvantages of the Audi NF engine

  • Most problems for owners are caused by malfunctions of the KE-III-Jetronic system.
  • The reason for floating engine speeds is usually a dirty idle valve or air leaks.
  • The cause of unstable operation is often clogged nozzles and a breakdown of the fuel pump.
  • Also, a number of components of the ignition system have low reliability here.
  • Closer to 200,000 km, hydraulic lifters often fail and start knocking.

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