How to change the rear 3 spark plugs on a Buick regal LS 2002

Quality wires, iridium plugs and air filter , close to $100 for parts. You doing it yourself will save a lot on labor . 3800 V6 ?

I found a video for a 1996 which should be similar.
Buick Regal Century rear spark plug replacement
this one isn't a video, but instructions for a 2000.
2000 Buick Century how do you change spark plugs lot of things in the way...

Is your SECURITY light flashing? If so, you have a V.A.T.S. problem. VATS stands for Vehicle Anti Theft System. Try getting a new ignition key made because the resistance value has probably changed in the one you have. If that doesn't do it you'll need to get a VATS bypass.

24mm

take the cover off the top and it will be a pain in the rear, 3 up front you cannot see and 3 in the back you cannot see.....might take it to a professional, or a trusted someone

alot of times the coil goes bad and kills the driver for the cylinder, remove the plug wire from that coil and see if it has spark if it does then my next step would be to do a compression test on #2 cylinder to make sure its not a mechainical problem. if the compression is good then check for vacuum leaks around that cylinders intake port and last is to make sure the firing order is right.the last thing would be to swap that injector with another cylinder and see if the misfire moves.good day.

it may not have a drain plug, you might have to remove the bottom radiator hose to drain the radiator....hope this helps......cheers.

Have you had a tune up? Spark plugs/coils, wires?

the front three are easy, you will have to disconect the engine strut mount and tilt the engine forward to get at the rear three, this is all done by feel at this point

Those tubes are to keep heat away from the boots. Try twisting the boots, but by the boot only, not the wire. They "stick" on if not lubed, or removed in a long time. (Use a little dialectric grease in the spark plug end)