1996 GMC C3500 Truck V8 6.5L Turbo Diesel Fuel Injector Standard Motor Products FJ173

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In this video we're going to be working with our 1996 GMC Sierra K1500 5.7 liter V8. We're going to show you to remove and replace a single CFI injector on a central fuel injection system.

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Here are the items you'll need for this repair: 8-10mm sockets, ratchet, socket extension, T20 Torx socket, 16mm wrench, flat blade screwdriver, pliers, hooked pick, paper towels, solvent, torque wrench

Lift up on the latches and remove the upper portion of your air box. Unplug the intake air step and mass air flow sensors. Pop the breather line off and undo the thumb screw. Rock the upper part of the intake forward and remove it from the vehicle.

Disconnect the throttle cables from the throttle body—the cruise cable just pops forward. With the throttle body open, you should have enough slack in the throttle cable to bring it around to the gap and slide the end of the cable out. Remove the throttle cable bracket. There's a 10 millimeter bolt at the throttle body, and a 10 millimeter nut down on the manifold side. We'll do this with a 10 millimeter socket and ratchet. Lift up and remove the throttle bracket and all we're going to do is just pull this out of the way and tuck it off to the side.

Label and remove all of the electrical connectors. It's not entirely necessary to label these, but I like to just because once you get back to putting everything together it can be a little tricky remembering what went where. We're going to disconnect everything attached to the upper intake manifold as well as the ignition coil module because those will have to come off.

We should have enough room to release the harnesses and move them out of the way while we lift this off. We'll disconnect the throttle position sensor, idle air control connector, the purge and vent solenoids on the side, the ignition control module, and the ignition coil, and of course the injector connector at the top. We'll pop that tab off. It may help to have a small flat blade screwdriver to pry out the tabs and remove the injector connector. You'll also need to undo the connector on the manifold absolute pressure sensor. Pop off any wire harness retainers you find around the vehicle as well. Just to help get some more slack on the harness for when we remove the intake, disconnect any hoses attached to the intake.

We have one on the passenger side, one on the driver's, and then one at the back for the vacuum booster, which we'll need a pair of pliers to remove. Use a pair of pliers to release the clamp on the vacuum booster hose. Sometimes if the hose is stuck, it helps to just hold the edges with a pair of pliers and work it side to side to loosen it up. Remove the three 10 millimeter nuts securing the evap solenoids to the sides of the intake manifold with a 10 millimeter socket and ratchet. We'll now remove these from the vehicle. You can either just hang them off to the side like this or you can undo that connector if you'd like.

Remove the two 10 millimeter nuts on the bracket for the ignition coil and control module. We'll then lift up and remove this harness retainer bracket. Move the harness retainer bracket out of the way. You'll then need to remove the three 10 millimeter nuts below that bracket securing your ignition coil to the intake. You can then hang that bracket off to the side as well. Remove the cap on the fuel straighter valve. It's usually best to use a fuel pressure test tool to thread on there, which usually has a relief hose on it that you can place into an appropriate container. You just want to push down here and make sure you bleed off any pressure in the fuel system.

Using a T20 Torx driver, you can use a screwdriver and a bit and a ratchet like I am here. Remove the two screws securing the distributor cap onto the distributor. Now, we're only doing this to gain access to the fuel lines, so you should just be able to unscrew the cap and push it back and out of the way without undoing any of your plug wires. If you do find the need to undo your plug wires, just be sure to mark where they came off of so they all go back in the same place.

Now, you're not really going to be able to see the other T20, because it's on the back side of the cap, but you can see the little indent there and just kind of do that one by feel. Where this screw is hard to reach and see, and you don't want to drop it, I suggest lifting up on the cap while you unscrew it to keep it in there. Once it's out, it should be a little easier to pop out and keep your hands on it. We're going to just move this out of the way. Using a 16 millimeter flare nut wrench, loosen the fuel fittings on the back of the fuel lines. These are down behind the intake on the driver's side. Then remove the 10 millimeter bolt securing the fuel line bracket to the back of the engine block. We'll do this with a 10 millimeter socket ratchet extension.

Remove the 10 millimeter nut underneath the thermostat hose or the upper radiator hose with the 10 millimeter socket and ratchet. This is securing a bracket that holds a little more of the wire harness in place, so we'll want that out of our way. It looks like this one is stuck together a little bit, so we're actually pulling the stud out too here it would appear. That's perfectly fine, because we're just going to hang this out of the way. We would need to remove that stud in order to take the manifold off anyway. We'll also want to remove the 10 millimeter nut securing the bracket over the EGR tube. We'll lift that bracket up and move that out of the way as well.

Now some of our nuts came out with the studs on them, so just follow around the perimeter of the upper intake manifold, which is the black plastic piece, and you should have somewhere between 13 or, in our case, eight studs left to remove. So just go around and just take all of those out with a 10 millimeter socket and ratchet. Remove the two eight millimeter nuts securing the fuel lines onto the injector bracket here. You'll want to lift the bracket off first just a little hold down that we just unscrewed there. Remove that and then pull the fuel lines out of the housing. You may need a little help prying these up. Remove those fuel lines completely.

Work the upper intake. This can take a little bit of effort to remove because the injector assembly here actually stays in the lower manifold so when we pop this cover off, we're trying to break this loose here too. Once you've got it off of the injectors, just work it up and out of the vehicle. Remove the injectors by pinching the tabs together and sliding them out. Just go around and undo all eight injectors this way. Once you have all your injectors unplugged, take a small flat blade and pry out the bracket. You may have to rotate the injector lines to clear the bracket. Remove the assembly from the vehicle.

Using an eight millimeter socket and ratchet remove the two eight millimeter nuts securing the injector hold down plate to the bottom to the injection manifold here. Using a pick or another small prying tool, lift up on the hold down plate. Make sure all your injector lines are out of the way there. You really don't want to break one of those. Using a pick or a small screwdriver, push out the injector you want to change just like that. Our injector's fine, so we're just gonna reinstall it. All you gotta do is put that back in there, and push it back in until it locks into place. Make sure the pins on the other side are lined up in their slots. Repeat those steps on any other injectors you need to change and reinstall the hold down plate with two eight millimeter nuts. Now, if you're ever worried about which injector is which, on the side of the actual manifold you have the number for the cylinder that injector goes to. So remember this when we reinstall and it will also help you decide which injector you need to replace and where it is.

Now you can probably tell our gasket or O ring is not in great shape. So normally you would probably need to use a pick to get it out of there, but ours is pretty badly worn out, so we'll just pop it off. You'll notice the difference when we install our new one. It's nice and tight. It stays in place. There's actually a little channel in there if yours was as bad as ours is. That's where you're going to want to put it.

Reinstall your injection manifold into its clip. Make sure all the lines are out of the way when you do this. We'll position them in a moment. It does go as you see here with the plug and the fuel pressure regulator on the passenger side and the two holes for our fuel lines on the driver's side. The first two we have here are two and four, which are going to be the first two cylinders, two and four on the passenger side or bank two. So we'll connect these into clip number four and first and then number two. So one goes over the other, nice and neat. On the other side we have three and one, which are going to be the first two cylinders, one and three on bank one or the driver's side. Same thing over here. You're going to put in number three first and then number one. The backside of this goes five, which will be the next injection port down the driver's side followed by seven, and that is going from right to left. We'll then have number six and finally eight and our fuel injection manifold is back where it needs to be.

Wipe down the gasket surface with a clean rag or paper towel that you've sprayed some cleaning solution on. I like to use brake parts cleaner. You could also use carburetor cleaner or a throttle body or fuel injection type cleaner. Really any kind of solvent that'll work to get that dirt and oil up and off of there. The style of gasket used on these upper intake manifolds was originally intended to be reusable. However, our truck has about 160,000 miles on it, so we'd rather just replace the gasket than risk it. We recommend you do the same thing. If your gasket has been changed more recently on your upper intake manifold, you may get away with reusing it, but we do strongly suggest replacing this part while you have it apart.

Reinstall the upper intake manifold. Be sure to move all your wiring harnesses, lines, brackets and anything else you had to loosen or remove. Now, it is a little tricky to get the upper intake manifold to sit down onto the plug for the spider. Just make sure that you work it on there. It will sit down. You do have to give it a little bit of force. Take your time, work it down onto that gasket, and make sure that it seals fully before attempting to install the bolts. Otherwise, you risk damaging the manifold.

We're going to start in the 12 o'clock position on our intake manifold and work our way around clockwise. You may choose to do this differently, but we do need to get all of our bolts and any brackets that these bolts secure in place before torquing our intake manifold. I just have the 10 millimeter socket on an extension here just to help me get some of these bolts started in. It is a little tricky to line this up, so you do want to make sure that you take the time to get all the bolts started before tightening anything down. Otherwise, you may find yourself loosening hardware to get other pieces in place.

Be sure to install any brackets you removed. Once you've got all your bolts in and started, go ahead and bring them down until they just touch the intake so we can begin our torque sequence. We'll torque the intake manifold following the proper torque sequence in two passes. The first pass will be 44 inch-pounds or five newton meters, and the second pass will be 88 inch-pounds or 10 newton-meters.

Reinstall any brackets that sat over the studs on the upper intake. Like here, we have the cylinder head temperature sensor. Also, reinstall this bracket over the ignition coil and control module.

Reinstall the fuel lines. Reinstall the hold down bracket and the two, eight millimeter nuts. Reinstall the fuel lines by getting the flare nuts lined up and threaded in, and tightening them down with a 16 millimeter wrench. You can then reinstall the 10 millimeter hold down bolt to the fuel line bracket. Make sure you reinstall the cap on the fuel straighter valve.

Reinstall your distributor cap. The two T20 Torx screws. I recommend doing the one in the front first because you can see it and line everything up. It's easier to install the back one after that.

Reconnect all of your electrical connectors. Be sure to snap back all of the loom retainers as well after you've connected the closest pieces to make sure that they all stay the same length. Don't forget to snap the safety back into the connector on the fuel injector manifold. You'll then want to reconnect any vacuum or breather lines that you unplugged.

Reconnect the brake booster hose at the back of the intake and compress the clamp with a pair of pliers, and slide it back into place.

Reinstall the throttle cable bracket with the 10 millimeter bolt securing it to the throttle body and the 10 millimeter nut on the bottom where it slides over the stud for the intake manifold. We'll then tighten those down with the 10 millimeter socket and ratchet. To reconnect the throttle cable, open the throttle manually and rotate the cable so it fits through the slot. Push the cable end in and set it into its guide, and lift up a little and snap the clip for the cruise control cable back onto its tab.

Reinstall the intake tube by hooking the tab over the front of the throttle body and setting the back into place. Reinstall the thumb screw on the stud. Reinstall the tube into the filter as well as locking it into the back of the air box. Reconnect your mass air flow and intake air temp sensors. Drop the lid black into place. Secure the tabs. Install the breather line and you're good to go.

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