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.
EA828 family: 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.
Frequently asked questions about the Audi NF
How much power does the Audi NF make?
The Audi NF develops 136 hp and 190 Nm of torque.
How much oil does the Audi NF take and which one?
Engine oil capacity: 4.5 liters. Recommended oil: 5W-40.
Does the Audi NF have a timing belt or chain?
The Audi NF uses a timing belt.
Is the Audi NF turbocharged?
No, the Audi NF is naturally aspirated.
Does the Audi NF need valve clearance adjustment?
No, the Audi NF has hydraulic lifters, so the valve clearances do not need to be adjusted.
How long does the Audi NF last?
The typical lifespan of the Audi NF is ~340 000 km with proper maintenance.
What is the fuel consumption of the Audi NF?
Audi 100 C3 1989: city 12.5, highway 7.8, combined 9.3 L/100 km.
What cars was the Audi NF installed on?
Audi 100 C3 (44) in 1986 - 1990.
What are the common problems of the Audi NF?
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. All known problems.
