Spark Plugs
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Registered User
Joined: Oct 2003
Posts: 60
From: West Bloomfield, MI
Car Info: 2003 Impreza 2.5RS
What are changing to new spark plugs gonna do for my car? I was thinking about putting new ones in but I wanted to get some input for everyone. On top of that, if I upgraded my spark plugs which ones would be the best to change to??
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Don't bother "upgrading" to some crazy expensive spark plugs, yet, unless you already have everything else done to your engine. I run NGK coppers, stock temp range. Work GREAT. Very smooth accleceration and good mileage improvement, if your current plugs are pretty old. You will be getting some pretty ishty mileage with real old plugs, especially if you drive hard a lot...
Ya, I made the mistake of putting Denso Iridiums in too early, and they were way too much for my engine, so bad, that I had a misfire in Cyl. 3 today. I put autolite plats in and they work great. Just my .02
hey i was over today at the subaru shop looking at my car, they had the engine apart, and the guy told me that you sho7uld just run the regular ngks in the engine, not the platinums, ngks' are going to work the best, i forget why he said you should not run the platinums though, ru8n the regular copper ones, ooh yeah, i saw my piston heads and there was a lot of carbon build up he said for like 33000m , i have pllatinum plug, who knows i thinnk he may be right, it is his job to rip them apart and put them back together so iguess he must know something, right.
I've actually heard that as well. For some reason some of the service techs at my local dealership told me that even if I don't get the plugs from them, don't run the platniums. Interesting...
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