Q: How to change sparkplugs? 1997 Cadillac Eldorado

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How do you change the plugs on this car. What can i do if the plugs are rusted , and wont break free. I see i can move the coil pack to get to rear plugs

My car has 140000 miles.
My car has an automatic transmission.

Hi there - your first move would be to carefully sketch or cellphone camera record each coil position, then removed the coil packs. Using a spray tube, hose down the spark plugs with rust penetrant (WD-40, PB Blaster or similar), then go to the beach for a week. Seriously! Then carefully use a spark plug socket, and attempt to unscrew each plug. A 3/8" electric impact tool is an excellent way to remove these (no air wrenches!) - small shocks to break the plugs loose without stripping the threads. Waiting for the penetrant to do it’s work is key here! If you strip the threads, a thread insert repair will be necessary (aluminum heads for the Northstar V8s). For professional assistance, I recommend spark plug replacement performed by a mobile, professional mechanic, such as one from YourMechanic, who will come to your location, and make this repair for you.

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