1990 Cadillac Seville



November, 10, 2010 AT 2:15 PM

Engine Performance problem
1990 Cadillac Seville V8 Front Wheel Drive Automatic 120000 miles

I would like to know how to change fuel injectors on my 1990 cadillac seville 4.5L


2 Answers



November, 10, 2010 AT 3:19 PM

Hello and thanks for donating

4.5L and 4.9L Engines

Disconnect the negative battery cable.
Properly relieve the fuel system pressure.
Raise the hood, install fender covers, and remove the air cleaner assembly.
Remove the fuel rail assembly. With the fuel rail inverted, detach the electrical connector to each injector by pushing in on the connector clip while pulling the connector body away from the injector. Spread open the clip slightly and slide the clip away from the fuel rail.
Remove the injector by twisting back and forth.
Disassemble the injector O-ring seals from the injector and discard.

To install:

Lubricate the new injector O-ring seals with petroleum based grease and install it on the injector assembly.
Install a new injector clip on the injector assembly.
Install the fuel injector assembly into the fuel rail socket as follows:
Push in to engage the retainer clip with the fuel rail cup.
The electrical connectors should be facing the engine front for injectors 1 through 4. The electrical connectors should be facing the engine rear for injectors 5 through 8.

Attach the electrical connector to the injector assembly.
Install the fuel rail assembly.
Energize the fuel pump and check for leaks.
Perform Idle Learn procedure.





November, 10, 2010 AT 5:01 PM

Thanks, just the information I needed. Bruce

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