2005 Chevrolet Uplander Q&A
2005 Chevrolet Uplander Question: How do I change the rear spark plugs on my 2005 Uplander?
Replacing the rear spark plugs on your 2005 Chevrolet Uplander is not an easy task. You can work from "over the top" if you wish. It can be helpful to remove some of the components mounted on the rear valve cover to help improve access. You can also work from the underside if you have access to a lift. I would recommend that you replace the spark plug wires along with the spark plugs and hopefully you will be good for another 90K. - Oakman
I just did my 07 uplander and after a long battle of trying to work over the top its almost impossible to get to anything.So you have to remove the plenum( that silver object) you see when you take the black cover off. Remove the necessary items wiring intake tubes sensors etc.Remove the6 or 7bolts that hold it down on top. There are 2 (13mm) bolts on the back under side you ll have to feel them and remove them. They hold the coil assembly . There is also a 10 mm bolt holding down the transmission tube that needs to come off also.Remove the plenum carefully and cover the intake holes to avoid dropping foreign objects.Feel on the bottom side of the coil assembly find the 2 bottom bolt retainer nuts and remove. The wires are now accessable and will take a good effort to remove. If you can get a picture of a3.9 or 3.8 on the computer you see how its assembled it helps. Be sure to label your wires on the coil pack before youremove them. - Visitor
take the front motor mounts off, put the van in neutral, drive, or reverse. may work in park too. cant remember which gear. you can then pull the motor forward. may have to remove the air cleaner hose, or a few other things. once you get the engine forward more, remove your coil pack, and then its not that hard. - steven m 1
I just change the plugs on my 05 chevy uplander. I went "over the top" of engine if you unbolt and move the coil pack to the side you can get the back plugs(it is not easy but it can be done). I was advised that the wireset should be replaced you can break them trying to pull them off(also being so close to the manifold the heat damages them and makes it that much harder to getting them to let go of the plugs). The Chevy dealer didn't know what was the problem with mine so I replaced everything (spark plugs, plug wires and the coil pack) It took me like close to 3 hours but it runs great now. Good luck. - CVshadetreemech
The uplander is a real nightmare,just changed the spark plugs and the wires. Remove the battery + wire , put trans in N ,remove the engine's 2 mounts ,remove the air cleaner large hose, pull the engine foreward(use a robe or an old tie) remove the alternator remove the wires (need to cut them down because they are stuck to the plugs ,remove plugs. Now install back , when donne : SELL the damn piece of junk. - bignono1