Raise and support the front end of the vehicle. Rear plugs are accessible from underneath the vehicle by reaching up through the area where the exhaust pipe runs. CAUTION - make sure vehicle exhaust is cool enough to touch before starting due to very limited access (automobile designers have long skinny arms and nimble double jointed fingers!). Take plugs, anti-sieze, dielectric grease, spark plug socket, various length extensions, swivel and drive under the vehicle, get comfortable, be patient and you can get it done. I did this on my 3.4 L vehicle and I presume the same procedure would apply to the larger engine.
Other answers on the internet suggested removing the upper engine mounts (dogbone mounts) and rocking the engine forward but this will not provide adequate access on this model
This is "BBAASPENCER" here in TN and I would like to give you another answer. Actually, the correct way GM list in their service manual is to take off the engine dog bones, attach a pulling strap to the engine and hoist and roll it until you gain access. That is the same procedure for many SUV/Van GM front wheel drives. If the first procedure listed here works for you, I'm okay with that. I just wanted to give you another option.
change sparkplugs on 2003 Rendezvous
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It is important to replace old spark plugs to keep a car engine running well. To replace them disconnect the battery, remove the cables, remove the old spark plugs, replace with the new spark plugs, replace the cables in the correct order, and connect the battery.
Buick Rendexvous Spark plugs change: 3 of them of are in the front so thats easy and the other 3 are in the back of the engine thats not easy but can be done! To do the 3 in the back you,ll need to watch a video on youtube showing one how to roll the engine forward to get to those 3 plugs.. watch it again on youtube... have Fun!
The front 3 are fairly easy, For the back 3 its easiest if you take the coil platform off and go from above the engine, Just make sure to mark what wires go where and you will have approx. 4 electical plugs to disconnect
Replace Spark plugs Replace Wires Replace fuel Filter Replace PCV Valve Replace air Filter
Disconnect the battery, remove the boot cover and spark plug cables, and pull out the old spark plugs. Put in the new spark plugs, replace the boot cover, and spark plug cables, and reconnect the battery.
Disconnect the battery of the car, remove the cables and boot covers, and remove the old spark plugs. Put in the new spark plugs, replace the cables and boot covers, and connect the battery.
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