gar52hpny Posted October 5, 2010 Share Posted October 5, 2010 I have a 2002 Subaru Outback 2.5, 109k miles. I was wondering if I should replace them with that many miles or is their a practical non equipment tests that I could perform myself to guage them? Thank you... Gary Quote Link to comment Share on other sites More sharing options...
idosubaru Posted October 5, 2010 Share Posted October 5, 2010 they're only a few dollars, i'd replace them. given that you might have headgasket work to do in the future you might want to hold off until then since they'll need to be removed/easier access for that anyway. Quote Link to comment Share on other sites More sharing options...
Rooster2 Posted October 5, 2010 Share Posted October 5, 2010 You may want to try to remove a couple of spark plug wires at the spark plugs. If they are original, I would not be surprised if you report back they are most difficult to remove. With time and heat the plug wires seem to shrink wrap themselves to the plugs. and cannot be removed without destroying them. If you plan to replace the plugs, you will almost surely need to replace the plug wires as well. Quote Link to comment Share on other sites More sharing options...
ShawnW Posted October 5, 2010 Share Posted October 5, 2010 Or they will be covered in oil because your spark plug seals are toast too. I would do valve cover gaskets and seals, spark plug seals, spark plugs, fuel filter, timing belt, water pump, idlers, cam and crank seals.... In other words you are 4K overdue on the timing belt, likely working on a head gasket very soon. Quote Link to comment Share on other sites More sharing options...
The Dude Posted October 5, 2010 Share Posted October 5, 2010 You might even have an extremly hard time removing the spark plugs frorm the head. Every 60K is the factory schedule for spark plug replacement on the DOHC 2.5. And it's only 60K because changing the spark plugs on the DOHC 2.5 is such a PITA. When the SOHC 2.5 has released the spark replacment interval dropped to 30K. I'll wish you good luck, but I hope that you don't need it. Quote Link to comment Share on other sites More sharing options...
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