Fuel Injectors
- Remove injectors but leave hoses connected. Place injectors in individual measuring containers. Operate fuel pump to build up pressure, then turn pump off.
- Lift airflow sensor plate half-way to operate injectors until one container has filled to 3.4 oz. (.10L). Volume of fuel in other containers should not vary more than 10-20%. Spray pattern must be even and cone-shaped.
- If one injector does not conform to specifications, switch hoses between it and another (good) injector at fuel distributor and retest. If problem remains with injector, injector is faulty or fuel line is restricted. If problem goes to other (good) injector, fuel distributor must be replaced.
- Relieve system pressure and remove gauge. Reconnect fuel lines and turn on pump to build up pressure. Injectors may leak slightly, but should stop leaking within 15 seconds. If drops form, check airflow sensor plate height, sticking control plunger or incorrect injector opening pressure.
- Remove injectors from vehicle and use injector tester to determine opening pressure. See Fig 1 . Check readings against specifications. See CIS (LAMBDA) FUEL PRESSURES table. Replace injectors if faulty.