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well i have a 1993 Cadillac sts and the front four are a breeze to get to just pull off the wires which may be hard sometimes but they will come... (remember the engine is cold...) blow out any dirt from plug valley (if any) replace with new... tighten as said...(tight but not too tight) bottom out then quarter turn... when doing back for use 10mm socket or wrench remove coil packs...(after removing cross bar for ease of entry)on packs re plugs from each side of packs...(can't be mixed up different sizes...) do the same to back plugs as fronts... change wires if needed... when finished... remove head of plug wires off coil packs one at a time holding close to coil terminal looking for spark in order to check if coils are bad too... an easy job...(bout two hours) less if you are working with two good hands

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Q: How do you change spark plugs and wires on a 1993 Cadillac sts Seville?
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