How to change 1994 Cadillac eldorado spark plugs?

Answer 1

Under the hood you will see a metal bar running across back of the engine it is attached above either strut cover with 2 bolts, remove this bar. Now pick a cylinder and remove the spark plug wire boot by giving it a quarter twist to the left and pull it out. Next use a spark plug wrench with a 8 inch extension to remove to old plugs. They may be in there pretty tight because they do not require change until 100,000 miles so they have a long time to cook in there. Apply spark plug grease to threads and screw the new one in use the spark plug boot to start the plug in because this is an aluminum block and you can accidentally cross thread the plug. With the plug started use the plug wrench on a torque wrench and tighten the plug to 21 ft/lbs. Now reconnect the boot and move to the next plug until you finish the front four plugs. Now the back four are little more difficult remember the bar you removed look behind it. There should be four black boxes sitting side by side on a aluminum rail these are your coil packs you can see this is where all the wires from your plugs end up. Behind the coil packs are the other four plug boots lined up just like in the front. Do these just like the front you can use a longer extension on your wrench or remove the coil packs to access them easier. Reinstall the metal bar then your done!

A few extra pointers your should change the wires at the same time you change the plugs. Also check your coil packs and remember to always keep track of what wires are going where this is why you do it one by one to avoid confusion.