Fix engine knocking sound
If you have an engine knock sound on a Ford vehicle, this article is for you.
Ford is experiencing a problem with upper intake manifolds that sounds like an engine knock sound. The internal baffle separates and makes a knocking sound as it is buffeted by airflow. The fix is to replace the upper intake manifold with a revised part from Ford (Dorman also makes an aftermarket manifold if you’re watching $$$).
To diagnose the problem, use an automotive stethoscope. Use the metal tipped probe and touch all around the upper manifold until you find the source of the noise.
© 2012 Rick MuscoplatPosted on by Rick Muscoplat