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How to Replace a 3100 Fuel Injector

A 3100 engine is a 3.1-liter version of the 60-degree V-6 engines from General Motors. It was in production from 1993 to 2005, and appears in many General Motors vehicles from this period, especially Buicks. The 3100 engine has sequential fuel injection, which uses fuel injectors under electronic control to deliver fuel to the cylinders. The procedure for replacing the fuel injectors in a 3100 engine is the same for all vehicles made after 2000.

Instructions

1

Remove the cable from the negative battery terminal so you dont start the engine accidentally. Open the filler cap on the fuel tank to relieve the fuel tank pressure.

2

Wrap a shop rag around the pressure test fitting on the fuel rail. Attach a fuel pressure gauge to the fitting, and place the bleed hose on the pressure gauge into a gasoline container. Open the valve on the pressure gauge to relieve the pressure in the fuel rail, and drain the excess fuel into the container.

3

Disconnect the upper intake manifold from the engine with a socket wrench. Detach the fuel send and return lines from the fuel injector. Remove the electrical connectors from the fuel injector and the coolant temperature sensor.

4

Disconnect the fuel rail from the cylinder heads with a socket wrench. Detach the retaining clips from the fuel injector, and remove the fuel injector from the fuel rail. Discard the O-rings on the fuel injector.

5

Lubricate the new O-rings with engine oil, and mount them on the new fuel injector. Connect the fuel injector to the fuel rail, and attach the retaining clips to the fuel injector. Install the fuel rail to the engine, and torque its mounting bolts to 7 foot-pounds with a torque wrench.

6

Attach the electrical connectors for the coolant temperature sensor and fuel injector. Connect the fuel send and return lines to the fuel injector, and tighten their retaining nuts to 13 foot-pounds with a torque wrench. Install the upper intake manifold, and tighten its mounting bolts to 18 foot-pounds.

7

Attach the negative battery cable with a socket wrench, and fasten the fuel filler cap. Start the engine and check for fuel leaks.

Posted by Unknown at 2:15 AM

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