Testing Off Car
NOTE: Inspect and replace any injector that shows any signs of rust.
CIS-E III injectors use a finer thread pitch for the line connection than previous CIS systems. The use of an adaptor is necessary for correct connection to testing equipment.
1. Install the injector on a bench mounted injector tester (Bosch KDJE-7452 (P400)) as follows:
a. Close the pressure valve.
b. Install and tighten proper adapter on the injector, (US 8034/7 or equivalent) using a copper gasket.
c. Install the injector loosely on the test pipe, and pump lever several times to bleed air from the system.
d. Tighten injector to the test pipe.
2. CONTAMINATION TEST
a. Open the pressure valve (turn counter clockwise).
b. Activate the pump lever, about 2 strokes/sec.
c. The pressure should build to about 1.5 - 2.0 bar (22 - 29 psi).
d. If the pressure does not build up, replace the injector.
3. OPENING PRESSURE TEST
a. With the valve open, operate pump lever at about 2 strokes/sec.
b. Injectors should open at 4.3 - 4.6 bar (62 - 67 psi).
c. Replace any injectors that are not within specification.
4. LEAK TEST
a. Loosen the pressure valve to drop pressure.
b. Increase pressure up to 0.5 bar below the opening pressure read previously.
c. With this pressure maintained for 15 seconds, no fuel should appear on the tip of the injector.
d. If the injector leaks, replace it.
5. SPRAY PATTERN
a. Close the pressure valve.
b. Activate the pump lever at a rate of 1 stroke per second. The injector should emit a "chatter" and the spray should span a cone of approximately 35°.
c. If these two characteristics are not confirmed, replace the injector.
NOTE: The injectors can be replaced individually.