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Hi, I'm Don from 1A Auto. I hope this how-to video helps you out, and next time you need a part for your vehicle, think of 1AAuto.com. Thanks.
In this video, we're going to show you how to replace the camshaft position sensor on this 2002 Chevy Suburban, and it's the same part and similar process on the Suburbans from 2001 to 2006. The items you'll need include a new camshaft position sensor from 1AAuto.com, a flat blade screwdriver, an 8mm and 10mm socket and ratchet with extension, a fuel line disconnect tool (in this case a 3/8 inch), pliers, a vacuum, penetrating fluid, and a torque wrench.
Start off by removing the 8mm bolt that holds on your engine cover. That pulls free. Then, using a flat blade screwdriver, just loosen up this hose clamp right here and this hose clamp right over here. Now, you can pull the hose free. Pull it free from this side, then just lift it up and pry out the hose from the intake hose. Then it's free. Now, remove these three 8mm bolts right here. We'll fast forward as Don does this. Then remove these three 8mm bolts right here.
Next, disconnect these two harnesses. To do that, you just pull up on the tab and pull them free. Then pry this hose right here free, and then remove these three 10mm nuts. Lift up this bracket and pull it aside, and then remove this 8mm bolt right here, and then just pull that bracket aside, and then disconnect this hose clamp, and do the same thing back here with this one. You want to make sure you disconnect that harness as well and pull that aside. Do the same thing back here, until this set of harnesses loosens up. Then just remove this 10mm nut right here, and then you can just pull that set of harnesses aside. Then pull up the clip on the harness for your fuel injector, then push the tab on the harness and disconnect it, and repeat the process for the other seven.
Now, just loosen up this fuel line cap, and using a flat blade screwdriver and a rag, you want to just put the rag over it and push the tab on the fuel bleeder. It should spray out just a little bit, and it'll release the pressure. Then replace the cap and come over here and just pry off this clip. Then, using a fuel line separator tool, you just want to push that all the way in. For this one, it's a 3/8 inch. Then, once that's pushed all the way in, you can pull the fuel line free, and then it just pulls off. You put it on the fuel line below it and repeat the same process. Take a pair of pliers and push the teeth together on this hose clamp. Slide it down the hose, and then pull the hose free. Then just remove this series of 10mm bolts along each side of your intake manifold. You can kind of see them, they're down below the fuel rail there. We'll just fast forward as Don removes these.
Lift your intake manifold up and out. You will have to maneuver a lot of harnesses and wires and everything but you just want to get this out as far as you can get it to go, which at this point should be right about here. Once you get to this point, take your EGR and just feed it through the harnesses and out. Once you feed it through, you can just lift your intake manifold up and out.
At the back of your engine block you'll see this harness. Just lift up the tab and disconnect it and remove that 10 mm bolt. We'll fast forward as Don does that. Now, using a flat blade screwdriver, just pry the sensor up and out. On the left is the old camshaft position sensor; on the right is the new one from 1A Auto. You can see they're identical and they'll fit exactly the same. Push the new camshaft position sensor down into place. Then just replace that 10 mm bolt. We'll just fast forward as Don tightens that up.
Reconnect your harness. Set your intake manifold back down into place, then just feed this hose down and pull it out through the other side. Now, disconnect your EGR by just pulling out on the clip with a flat blade screwdriver and just pulling the hose free. Then feed that hose through the side of your intake manifold. Just maneuver it down and into place. We're going to fast forward as Don continues to do this. You just have to move the cables and wires around until you can finally get it to set down, it does take a second but it will go down. Now reconnect this hose. Just using pliers, slide that hose clamp back into place, and then reconnect this bracket. You want to just line this up and push it back onto those studs. Then just replace those nuts.
Take the EGR valve and push it back down into place, and replace the bolt that holds it there, and then reconnect that hose. Reconnect your other hose to the top of your intake manifold, replace this bracket and replace the bolts that hold it into place, reconnect this hose over here, and then replace this bracket and the bolts that hold it into place and just tighten those up. Then just replace each of these long 10mm bolts that line the side of your intake manifold, and then just tighten each of those up. You can see that we use a variety of different extensions just to help get there. You can use a longer one for these ones, then, as you get further back, you may need to use a shorter one. It does help to have a flashlight, too. Just make sure you reconnect your fuel lines, and then put those clips back into place to lock them.
Okay, you want to torque the manifold bolts. Start in the middle and go across, then work your way around the manifold in a counter-clockwise pattern. You want to tighten them on the first pass to 44 inch pounds, then 89 inch pounds. Now, just reconnect each of your fuel injectors. You just want to push the harness in and replace that clip and push it down into place. We'll fast forward as Don does this to the other fuel injectors. Lower the intake hose back down into place. You just push it back and then tighten up those two hose clamps. Double check that all your harnesses are connected and all the hoses are connected, and then replace your engine cover. Once you get it lined up, just replace that bolt and tighten it up. Then you're all set.
We hope this video helps you out, brought to you by 1AAuto.com, your source for quality replacement parts and the best service on the Internet. Please feel free to call us toll-free, 888-844-3393. We're the company that's here for you on the Internet and in person.
Tools used
All right, we wanna disconnect the battery, disconnect the negative cable. Use an 8-millimeter ratchet wrench or a wrench. And slide that out of the way. Take this engine cover off. There's one screw right there. Use an 8-millimeter socket. Just raise the cover up and slide it forward. Now we're gonna take the snorkel off. Use an 8-millimeter socket or a straight blade screwdriver. Loosen up this worm clamp. And then over here, near the air box, attached to the mass airflow sensor. And there's gonna be a bracket right here that's attached. This one is actually broken. Just use a trim tool to loosen that up. Then you can grab the snorkel, just rock it back and forth and take that off.
I'm gonna take this plate off. I'm gonna use a 10-millimeter socket, take these two bolts out. And for this back one, I'm just gonna use a ratchet wrench because you can't get underneath here. If you had a shorter socket, you could, but... Take that bolt out and then just grab the plate. Take this nut off. There's a bracket right here that's holding this wiring harness on. Just use a 10-millimeter socket. Slide that up. Now we're gonna disconnect the electrical connectors. You can disconnect the one right here on the purge valve. Just slide this lever up. And then on the alternator, push this little lever down. We're just trying to get slack so that we can move this out of the way. Disconnect this connector right here. This goes to a sensor down below there. Slide that out of the way. And then there's the injector sensor connectors.
There's a little lock on here, you slide the injector lock up a little bit, then you can push down on the lock tab and pull it up. Sometimes you just pull this lock completely off. So this is how this works. Normally, this is in here. So normally, this lock is right here, you can just slide this up a little bit, and then you can push on the tab and it should release. But sometimes if it's too difficult, just slide this lock completely out and it's a lot easier. So do that for the other injectors. Three more on this side and then the other side. So disconnect the throttle body, just slide this tab out, push down on the connector, slide it off, and then again with the fuel rail connectors for the injectors. Take these off and disconnect the MAP sensor. Slide that connector up. Disconnect it. That should be all the connectors.
You can just slide this harness out of the way. Just go to the side. Now I'm just gonna remove this connector. Just slide that off and just set that aside. Now there are coolant hoses that go through the throttle body, so you have to take those coolant hoses off. You don't necessarily have to take the throttle body off, but you definitely have to take those hoses off. Make sure the vehicle is cool when you go to take these hoses off. I'm gonna use a couple of clamps on the hoses to prevent losing coolant. So then less coolant you have to top off. These just crush the hose and you can take them off. Do the same on this hose right here. You may use some hose clamp pliers. Just slide these hose clamps down and then you can try twisting. Twist the hose and slide it off and do the same for the other one. Then I'll just use hose-removing pliers and slide those off.
So this hose goes to the valve cover. Just take this hose off here. Just slide it off just like that. Set it aside. Then we wanna disconnect the purge valve. Just push down on this lock right here. Slide it up. Then this vacuum hose right here goes to this valve cover. Just slide it off the valve cover over here in the back, and you can either leave this connected to the intake or just try to slide it off over here like this. If it's out of your way, you can use a pick to loosen that up. I'm gonna slide the pick around here. I'll just try to twist this off a little bit. There we go. And slide that down, slide that out of the way. Now, there is some dirt and debris at the bottom of the intake. Before I disconnect the fuel line and have gasoline in that area, you could use a vacuum to try to vacuum that up or just use a blow gun and just blow it away.
Now, there is gonna be pressure in the fuel line, so you wanna release that pressure before you pop the line off, and there is a little cap with the Schrader valve right there, take the cap off. You can take a rag, just so the fuel doesn't spray everywhere. And what you wanna do is push on that Schrader valve and just release the pressure. Once you get in that area, cover this up and push the valve. You should wear safety glasses while you're doing this. There's no pressure in this, so that's good. The fuel line connects right here and there's this clip, you just slide it up and slide it out. You might have to use a screwdriver to bend that up. Slide that out, set that aside. And then you're gonna need a special tool to take this off. Go around the fuel line and you're gonna press it into this, into the fuel line, and then slide the line off. There are little fingers in there. There we go. See the little fingers right there. And then you can take this tool off.
Now, this vehicle has a hydraulic booster. It doesn't have a vacuum booster. If you have a vehicle with the vacuum booster, you're gonna need to take that hose off, either at the booster on the back of the intake. Now, use an 8-millimeter socket, and there's a bolt right here, right here, right here, and then two in the back, so five bolts per side. Take those bolts, loosen them up. They should be caged so they're not gonna come out of the intake, you just gotta loosen them. With all those bolts loose, you can grab the intake and slide it up. Ad this hose, you're gonna have to feed it underneath the fuel line right here. You could take the fuel lines off, if it makes it easier, but you don't have to. To make it easier, I'm just gonna pop the line off right here. It's hard to grab that while the intake is still on there, but just push down on the lock and slide it up. Just grab the intake and slide it out.
Now, disconnect the cam sensor. Just slide this tab up and slide it back, just like that. Take a 10-millimeter socket and take this bolt out. And then we can grab the sensor. Just rock it back and forth a little bit. We can use some pliers, just try to grab it. There it goes. And slide it out. Now you can take the new sensor, you can put a little grease on the O-ring or even a little bit of engine oil. And slide it in position, and just wiggle it down. That's good. Take the bolt, get that started. And snug up the bolt. That's good. Now take the connector, line it up, and lock it back in place. Now I'm just cleaning up the surface area where the intake goes, where the intake gasket meets the head. You can use a small razor blade. Just be careful, you don't wanna gouge the metal. Just use it lightly, or a small scraper. And just try not to get any of the dirt into the intake ports. And you can take a rag and a little break parts cleaner and just clean up the surface.
You wanna replace these gaskets whenever you take the intake off. There's a little clip right here, just slide that off, and the clip right here, and right here, and just clean up any of this area, get some of that carbon off, try not to let it go into the intake itself. And just take a new gasket, line it up, lock it down and do the same with the other side. And right before we put the intake on, just take a blow gun, just make sure nothing got into the ports. All right, take the intake and just line it up. Just make sure none of the wires get in the way. That looks good. And take this evap line and just line it up in the back and lock it down. And that's good. You can lock it down right here as well. Just so we don't lose this connector, just grab this, and just line it. Click this in position right here. We'll connect it later. That's good.
Now we're gonna torque these down. Now there are two torque sequences that you do. The first pass, you're gonna torque these to 3.7 foot-pounds, and this is number one right here. Now, 3.7 is pretty much just snug, so that's number one. Number two is right here. And number three, you go to the next one in the back, not all the way to the back, just right there. And number four is right here, so from the middle, the next one forward. Number five is on the passenger side, the next one back. And number six right here on the driver's side. Number seven, the most forward one on the driver's side. Number eight, the furthest one back on the passenger side. Number nine, the furthest one back on the driver's side. And number 10.
All right, so on the second pass, we're gonna torque these to 7.4 foot-pounds in the same routine, same procedure. So number one right here, number two right here. Number three, a little further back. Number four on the other side. Number five right here. Number six. Number seven. Number eight back here. Number nine right here. And last, number 10 right here. And now we'll install the fuel line, just line that up, lock it in place, then take that lock, put that back on, snap it down. Take this line that goes over to the valve cover and line that up and put that right there. And take this hose, get that lined up. And then if you had the hose for the brake booster, you're gonna wanna hook that up. Now we can hook up these coolant lines under the throttle body. Line those up. And move the clamps over. Same with the other one. Pretty much put those where they were when they came off, and you can take the hose clamps off or the hose pinchers, take those off.
And then from the back of the engine, start hooking up the wires, so the MAP sensor, line that wire up, connector. Then connect this connector right here. And then all the fuel injector connectors, line those up, lock those down, and then put the lock on as well. And push that down. You can wiggle them a little bit, make sure they're on there properly. And just take this bracket, just line that up. That's good. Connect the alternator and the purge valve. And connect the injectors on the passenger side, same as the driver's side. Just line them up, lock them in place, push down on the lock. And connect the throttle body, line that connector up, push down on the lock. Take this nut, put that on that bracket and snug that up. And take this bracket, line this up, and put the bolts in. And snug these up.
Now put the snorkel on, just line it up over the throttle body and then over the mass airflow sensor. And just tighten the worm clamp down. Just snug. That's good. Reattach that bracket. Just slide that through the pinhole right there. That's good. And take the engine cover, line it up, get the bolts started, and snug it down. Now we can hook up the battery. Line it up, get it started, and snug it up. Make sure it's not loose. That's good.
Tools used
Let's get this cover off of here using our 8-millimeter socket. Now that that covers out of the way, if I was to follow this right here, and come along the backside of the engine, I'll be able to feel where the wiring harnesses that leads down to that camshaft position sensor. And I'll also be able to feel where the 10-millimeter headed bolt is.
It's not really something that you can easily see, and you might even have a little bit of a hard time getting to it. But, I'll show you it a little bit better by taking off the intake. You don't necessarily need to take off the intake. You can do this with something as simple as an extension, a 10-millimeter socket, and a 3/8 ratchet.
So now we got the intake out of the way so you can see exactly where we're gonna need to be. You don't need to take the intake out to get to this. Like I said, you can come right along the top of the intake, bring your extension down with your 10-millimeter headed socket on there. And we take this right off.
So reach down along the backside of that intake, feel with your finger, grab onto this. Grab it. Slide it right off. Now we're gonna use our 10-millimeter right here. You grab onto this. Sometimes you just got to wiggle it around a little bit to break it free. Now, sometimes the sensor back here is gonna be stuck inside the engine. If that's the case, you could try to come behind the intake with something that looks like this. Nice little curve to pick. Right down along the backside see if you can grab on to it, and just see if you can get it to come on out of there.
Sometimes, these will come right out, other times, you'll have a much harder time. If that's the case, and for some reason you can't get it out, I would go ahead and remove the intake system in which case we have a video that can show you how to do that. Give it a nice tug. There it is.
The next thing you're gonna wanna do is lubricate the seal right here. Just use a little bit of engine oil. Now, I'm gonna take my rag, and I'm gonna clean out the inside of that hole as much as possible. It's pretty nasty. Let's grab our sensor. So you just wanna push this down so it's completely level with the engine. Line up those bolt holes, and then we're gonna put our bolt in.
Grab your electrical connector, slide it in, give it a nice tug. That feels great. Let's get our engine cover back on. We're gonna slide the back side in so it connects into the hooks. And just drop this down. Now, you would just tighten up your mounting nut up here, mounting bolt. Give it a nice wiggle. Perfect.
