I have a 2012 Town and Country. It will knock one time when I start the vehicle. It will only do this on the first start of the day. Do you know what could cause this.
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it has 127000 miles

Old school eh.

By knock you mean valve chatter/pinging? Might try running a tank of premium fuel with a higher octane to see if it makes a difference. https://www.yourmechanic.com/article...-engine-knocks