hi everybody, i have a 93 dodge dakota 3.9 liter that has been making an odd knocking sound that lasts about 10 seconds after the motor is shut off. the fan isnt hitting anything, as the noise continues after the fan has stopped. i think it may be the lifters, but im not sure. also, the truck has 222k miles on it, so if anyone has any suggestions of other items to check, please tell me. im pulling the left cylinder head this week to drill some sheared off exhaust manifold bolts, so ill already be pretty far into the motor. thanks.