murphsubaru Posted July 24, 2007 Share Posted July 24, 2007 When should the plug wires be changed on a 99 Forester? My owners manual and maintanence book does not say. Link to comment Share on other sites More sharing options...
NoEyeSquareGuy Posted July 24, 2007 Share Posted July 24, 2007 There is no service interval. I usually change mine every 60k miles, as they tend to harden and crack due to heat and exposure. Link to comment Share on other sites More sharing options...
fishy Posted July 24, 2007 Share Posted July 24, 2007 I just changed the wires on my 99 legacy. It looked like it had the original wires from 99 on it and I thought it ran perfectly. I put new NGK wires from the stealership on it and I think the car reclaimed about 10hp and is also now smoother through the full range. Long story short: if you've got orginal wires it's definately time to change them. Link to comment Share on other sites More sharing options...
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