How do I access the rear 4 spark plugs to change. Not too easily accessable from front of engine.
Cadillac Q&AAsk Your Question
1993 Cadillac DeVille Question: spark plug replacement
Visitor, August 27, 2010, 19:21
This car has a "subframe" which holds the engine and transmission assembly. The subframe is held to the body of the car by six bolts. There are two bolts holding it to the car at the front, and four bolts near the rear. They all require a 15mm socket. Support the "body" of the car with jack stands. Place a jack under the crossmember and loosen all six of the bolts on the subframe. The front ones only need to be loosened 2-3 turns. The rear four need to be as loose as you can get them without them falling out. Make sure you have at least a couple of threads on each of the rear four bolts so the frame doesn't drop down too far. Once you can see about an inch of clearance between the subframe and the body mounts, you should have enough room to reach up over the sway bar to the spark plugs. Twist the boots on the wires to help get them loose. It is not a fun job, but if you take your time and don't get frustrated it CAN be done.
Answer #2Visitor, November 30, 2010, 17:37
Your gonna wanna use a rotary lift.