How to Change Your Fuel Injector - Got Fuel?

Before starting we wanted to have baseline fuel-pressure readings. This is the Schraeder valve to tap for our fuel-pressure gauge.

When checking fuel pressure, factory specs call for readings of 40.5-47.0 psi with ignition key on and engine off. Our reading was right in line at 43.0 psi. With key on and engine running, factory specs call for 3-10 psi lower than engine off readings. We found 36 psi, which was right in line at 7 psi below engine off readings. So we knew we had a good starting point.

Next step was removal of the clamps holding the inlet tube for the Mass Air Flow (MAF) sensor.

Then we lifted out the MAF sensor assembly.

We were careful to disconnect the wiring going to the MAF air flow sensor.

Next step is disconnecting the throttle linkage, including the cruise control connector as well as the throttle valve (TV) cable that was routed underneath the plenum of our '87.

We also removed the one intake runner bolt that holds the cable stay for the throttle and cruise-control cables.

When disconnecting the power brake booster vacuum line from the rear of the plenum it's best to use a 51/48-inch flare nut (line) wrench while holding the mating fitting with a 31/48-inch wrench.

Remove the four bolts that hold the throttle body to the plenum.

Two coolant hoses must be removed from the throttle body before you can lift it out. We had previously disconnected those hoses during an earlier modification. Their former locations are capped with a blue and a black plastic cap.

Note the different length of the lower runner bolts so you can be sure to reinstall them in the proper position.

With the upper (4) and lower (all 6) plenum bolts removed, you can carefully pry the top of the righthand runner assembly away from the plenum.