Anytime your engine is not running correctly, or missing. Otherwise on a 1995 or older car change them at 50,000 miles. On a 1996 or newer car change at 100,000 miles.
when do you change spark plugs
Generally, to replace spark plugs on a Subaru vehicle, the spark plug boot should be removed. Then, the old spark plugs should be removed using a socket wrench, and replaced with new ones.
To change the spark plugs in a 1997 astro van do I have to change the spark plugs from the bottom of the engine/
Change the plugs at 100,000 miles or earlier if the engine is not performing as it should.
Depends on the type of spark plugs. Factory plugs around 70 - 100k depending on the condition of the plugs. I would replace the spark plugs out with some AC Delco iridium plugs they will last you 100k+.
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