Hey guys, I installed an iridium CR7EIX spark plug today. First time I changed a plug in anything.I have a question: after I installed, I took it for a ride. I noticed that after I accelerated and then let off on the throttle, I used to hear like a winding noise. Same thing when I would shut the engine off. I would hear something that I thought was the belt, winding down or stopping. Now since I put the new plug in, I hear nothing. On de-acceleration and shutting the engine down. Any ideas? Is it my imagination?
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