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
when do you change spark plugs
you can use ngk or Bosch it will perform very good, but please don't change the spark plugs when the engine is still hot because it will smoke
To change the spark plugs in a 1997 astro van do I have to change the spark plugs from the bottom of the engine/
Generally I change platinum plugs at 100K and regular plugs at 50K.
how to change spark plugs on a 2001 expedition
You don't you can change them while the car is still hot its no problem.
Not at all. Just watch yourself so that you don't get burned on the exhaust or other hot parts.
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