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.
Specifications
| 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 |
12.5 7.8 9.3 |
| 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.
