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Re: 4.3 spark plugs..25 & 26
I debated between these two heat ranges for my engine . Did alot of research . The 4.3 uses these two in many of the autos and van . You may have the hotter plug in when you dont need it and you are are getting preignition/detonation . And the knock sensor is retarding the ignition to counteract it causing incomplete burning of fuel , that you smell. I would go back to the original number , I did. Rob
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