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I installed a 180 thermostat last year and ever since the cel is on. I am not saying it is the stat, but I guarantee It is. Has anyone else that has a hemi and is running a low stat had problems? My truck is pinging, pinging out the cats I believe. I know this is bad, it is the sound when you shut your vehicle off hot and it makes little crackles and pings from dissimilar metals and whatnot. I am guessing my truck is running super rich? Or is the computer compensating and leaning it out? I am getting it switched out to avoid any damage. Anyone have any knowledge or anything they would like to add? :help: