Adjust idle speed
Connect tachometer— With engine warm, check idle speed.
- 820 ± 50 RPM (1977 – 82 and 83 Vanagon)
- 880 + 50 RPM (1983 Rabbit/Jetta)
- 950 + 50 RPM (82/83 Quantum, 4000)
Loosen locknut and turn adjusting screw.
- Clockwise increases RPM
- Counterclockwise decreases RPM
Tighten locknut.
Adjust maximum speed
Accelerate engine briefly to “maximum speed stop.”
- 1.6 L (5300 – 5400 RPM)
- 1.5 L (5500 – 5600 RPM)
- Vanagon (4750 – 4850 RPM)
Adjust by loosening lockut and turning maximum speed screw.
- Clockwise decreases maximum RPM
- Counter clockwise increases maximum RPM