Coolant will prob come out when you remove the old knock sensor? Yes it will. But if you dislike or HATE the green sticky bath running down your arm you can stop this. A cooling system with no leaks. Remove the rad cap. I use the OEM caps. The rad is full of coolant. Clean the rad cap bottom rubber surface with carb or brake clean. Tape the complete section off that has the vent on the bottom. Trim the excess tape off the edges with a razor blade. (This stops the air from entering the system stopping the leak.) Install the sealed up cap on a cool full system and remove the knock sensor. Install the new one right after. No Nasty Sticky bath and no coolant all over your back. Works for me. (Note: The sensor has a torque requirement. If you desire to increase the sensitivity, tighten it a bit more. If you use Teflon sealer it is suppose to decrease the sensitivity but I use the sealer and over torque it just a bit more. Used sensors can spin as the assembly is stamped.) Buy a new knock sensor.
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