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
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, 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.
Change the plugs at 100,000 miles or earlier if the engine is not performing as it should.
How to change the spark plugs
how to change spark plugs on a 2001 expedition
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+.
2002 galant , can't find the spark plugs
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Change spark plugs on 1999 Lexus GS300?