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When do you remove the spark plugs from a 1999 Chevy Cavalier When the engine is hot or cold?
Wiki User
∙ 18y ago
It doesn't matter, but it is lot's easier when the engine is cold. The plugs get very hot. Cold....When hot the head may strip when unscrewing the spark plugs. Whether hot or cold you must use "anti sieze" spray or "un-seize" spray, after about 100 miles or so your new plugs get really hot as well as the head wich is metal wich expands as molecules in the metal of these engines and plugs heat up amd move faster and rearrange wich causes a microscopic molecular rearrangement when it cools down again so as a result the spark plugs are "expanded" or "set" into their slots, make sure you ask for the spray to get the spark plugs loose at your auto parts store when getting ready to change plugs and always use premium plugs and wires and change wires every time you change plugs and use high performance wires for maximum fuel efficiency as well as horespower
Wiki User
∙ 18y ago
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