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I can hear a knock after driving on the highway and then slowing down or coming to a stop (even parked and engine shut off). It doesn't last for long maybe about 10-15 seconds. Any ideas of what this could be? Someone told me it could be the timing chain since it tightens and loosens to change timing. Does this sound right?
You're saying that this noise can happen "even parked and engine shut off"??? If that's really the case, I have to wonder if somehow you have air trapped in the cooling system.