Checking return flow rate of injectors (cylinder bank 1) — AUDI

🧭 Before you start

Fits: Audi A8 D2 (4D)

• Special tools named: V.A.G 1348/2B

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• Always read rules for cleanliness and instructions for working on fuel system .Follow these instructions before starting work and while working on the fuel system. — Detach engine cover.
• The return manifold between cylinder 1 and the fuel temperature sensor must be sealed off with 3094;Schlauchklemmen bis Ø 25 mm to stop fuel escaping at the disconnected return pipes.

🔧 Engine codes this applies to

📋 Procedure

1. ⚠ Always read rules for cleanliness and instructions for working on fuel system .Follow these instructions before starting work and while working on the fuel system. — Detach engine cover.
2. Unfasten hose clamps (1) and remove air duct.
3. Detach retaining clips (arrows) of return pipes.
4. Detach return pipes at all four injectors and attach four hoses (approx. 90 cm long) to return connections.
5. Secure hoses with retaining clips again.

6. The return manifold between cylinder 1 and the fuel temperature sensor must be sealed off with 3094;Schlauchklemmen bis Ø 25 mm to stop fuel escaping at the disconnected return pipes.
7. Feed the four hoses into V.A.G 1348/2B;Messgerät.
8. Start engine.
9. If the return flow rate of one or more injectors is so high that the engine will not start or is very difficult to start, this already becomes apparent when operating the starter from the considerable difference in the extent to which the measuring tubes are filled.
10. If the engine starts, there should only be a minimal difference between the return flow rates of all four return pipes with the engine warm and idling at about 650 rpm.

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