Injectors — removal and installation (BMW 7 Series E32)

New injectors are protected with a preservative. After about 5 minutes of operation, they are cleaned by the fuel passing through them. Injectors removed from the engine cannot be stored for a long time due to the risk of corrosion.

Removal

Remove the oil filler cap. Pry up the small caps with a screwdriver and unscrew the bolts underneath. Remove the two plastic covers.

Disconnect the lambda probe connectors. Remove the VANOS solenoid valve connector.

Note: Some models have the supply pipe screwed directly into the distribution pipe. In this case, the sealing ring must always be replaced and lubricated with petroleum jelly during installation.

In another design, the fuel hose is secured with clamps, and in this case, a special tool or similar clamps are needed to release the clamps. Before installation, check the sealing ring and replace it if necessary.



Remove the mounting bolts (arrows) for the fuel distributor.



Remove the vacuum hose (1) from the fuel pressure regulator (2 - fuel connection; 3 - place of attachment).

Pull the fuel rail and injectors up and out of the cylinder head. The injectors are simply inserted and can be pulled out.



Pull the clips (4) to the side and remove the injectors.

Installation

Insert the injectors into the fuel rail and secure them with clamps.

Lubricate the O-rings with petroleum jelly or SAE90 gear oil.

Press the injectors and fuel distributor evenly into the cylinder head.

Caution: When installing the injectors, make sure that the sealing rings are not damaged. Replace damaged sealing rings, paying attention to the position of the other sealing ring. Lubricate the sealing rings before installation only with technical petroleum jelly or transmission oil.

Secure the fuel rail to the cylinder head with two bolts.

Put on the hoses (fuel lines) fuel supply and return to the distribution line and secure them with new clamps or sealing rings.

Connect the plugs of the lambda probes and the VANOS solenoid valve.

Place the injector plug strip on.

Install two engine covers, put on the oil filler cap.

Read the fault codes from the DME system memory. After troubleshooting, erase the codes from the memory.