The 1989 Cadillac Fleetwood was offered with different engines, and each one has a different firing order. When changing the spark plugs, remove one wire at a time. If you need to remove more than one wire at a time, label the wires to avoid wrong routing or cross-firing. The 250-, 273-, 307- and 350-liter engines have a firing order of 1-8-4-3-6-5-7-2, and the distributor rotates counterclockwise. The 252-liter engine's firing order is 1-6-5-4-3-2, and the distributor rotates clockwise. The 368-, 425-, 472- and 500-liter V8 engines have a firing order of 1-5-6-3-4-2-7-8, and the distributor rotates clockwise.
Tools Used: Spark plug wire pliers, Spark plug socket, Extension (optional)
Replace Spark Plugs
Open the new spark plugs. If the plugs have a ring, screw the ring onto all the spark plugs. Check the gap on the new plugs. The gap information for the engine is located on the engine tag on the hood of the Cadillac or on the fan shroud. Make sure the engine is cold before removing the spark plugs.
Pull the spark plug wire off a spark plug using the spark plug wire pliers. Remove the spark plug using the spark plug socket.
Thread the new spark plug into the spark plug hole as far as you can by hand. Tighten the plug with the spark plug socket until it does not turn anymore. Do not overtighten the plugs or you will break the porcelain. Push the spark plug wire onto the plug until you hear or feel it snap into place.
Repeat Steps 2 and 3 for the rest of the plugs. If you cannot get to a plug easily using only the socket, attach the extension to the socket. The extension will give you more turning radius in tight quarters.
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