On Sunday night I replaced my Valve Cover and EGR Gaskets. I managed to come up with 3 questions in the process:
1. Which bolts hold the TB to the intake? I see some Torx and the two tall bolts that hold on the air cleaner cover. I wan't to tighten the throttle body to the specified torque to make sure I don't have any vacuum leaks under it.
2. Under the valve cover everything was varnished a pretty dark brown (no sludge or goop, though, which is amazing given the age of the car). On two of the pushrods, there was a shiny band where the varnish had been polished off right where the rod runs up through a notch in a kind of stamped metal guide under the rocker arms. This only happened to the second and third rods counting in from the drivers side. What causes this and is there any cause for concern?
3. EGR. When I pulled the EGR off I checked it for carbon. It didn't seem to terrible -- sprayed TB cleaner on the pintle and in the passages. I did notice that when I pushed on the diaphragm it move relatively freely, but it didn't immediately snap back in to position...it kind of slowly returned over the course of a second or two and I could hear the air sucking through the tiny pinhole in the vacuum port. Is this normal?
The reason I pulled the above stuff off is a continuing effort to cure a lumpy idle -- I thought maybe the EGR had carboned up.
Thanks for any information.