Quote Originally Posted by WILLY View Post
Check that egr valve nut under the egr,when loose or not put back in they tend to make a noise similar to an engine knock,mine did.
Did you check this? It would be very easy to overlook upon installation, & it's not uncommon for the EGR nut to vibrate loose.
Many here won't leave home without a 22mm "stubby" wrench in the glove box.