Testing On Car

Fig. 10 Special Tool 1348/1 Installation:

1. With fuel line connected, pull injectors from the holders in the head.
2. Put injectors into a test stand (such as US 4480, or VW 1348, Fig. 10), or a set of transparent graduated cylinders.
3. Remove boot from air flow meter to gain access to the sensor plate.
4. Remove fuel pump relay and install a jumper wire between terminals 13 and 14.
5. With the fuel pump running, lift the sensor plate and observe the spray pattern of the injectors. Replace any injectors that do not maintain a well atomized, even cone throughout the full range of sensor plate travel.
6. With the sensor plate in the rest position, look for leakage at injector tips. Replace any injectors that leak.
7. Lift sensor plate to the full throttle stop for 20 seconds. Fuel quantity should be about 80 ml, and the difference between injectors should be less than 8 ml.
8. If the difference is not within specification, repeat test. If results are still not within specification, replace the faulty injector and retest.
9. If the same cylinder shows insufficient flow with a new injector, check for kinked or clogged injector line. If line is OK, replace the fuel distributor.
10. Before installing injectors;
a. Check the injector holders for tightness.
b. If injector holders are loose, first remove and clean the holder assembly.
c. Replace both 'O' rings, and sealing washer on each injector holder.
c. Coat threads with appropriate sealant (D-6 sealing compound or equivalent).
d. With a 13 mm allen wrench, injector holders should be torqued to 20 Nm (15 ft/lbs).
e. Check injector seals for damage or hardening. Replace as necessary.
11. When installing injectors, press them into the inserts until they are fully seated.