Fuel Injector Spray Pattern and Leakage, Checking

FUEL INJECTOR SPRAY PATTERN AND LEAKAGE, CHECKING

WARNING! The fuel system is pressurized! Before loosening hose connections or opening the test connection, wrap a cloth around the connection. Then release pressure by carefully loosening and disconnecting the hose or fitting.

Special tools, testers and auxiliary items
- VW 1594 connector test kit
- VAG 1630 digital potentiometer
- VAG 1602 measuring unit

Test sequence
- Remove toothed belt guard, upper part.
- Remove fuel rail complete with fuel injectors





- Hold fuel injectors in VAG 1602 measuring unit.





- Disconnect harness connector from engine coolant temperature sensor G62.
- Set VAG 1630 digital potentiometer scale A to 15 k Ohms and connect to connector terminals 1 and 3 using adapter cables from VW 1594 test kit.
- Disconnect harness connector from ignition coil.
- Operate starter (2nd person required).
- Fuel injectors must pulsate and discharge fuel in accordance with cylinder firing order.
- Switch ignition off and check injectors for leaks.

Specification: No more than 2 drops/min. may leak from each fuel injector.

NOTE: When installing the fuel injectors, make sure that the O-rings are not damaged.