(SOLVED) Dead cylinder at idle? Low temp on header collector

RustyRatRod said
I'm sure you mean impossibly for exhaust to travel under the intake as in into the intake valley, right?

No, “Impossible.” But from that side of the manifold since that is the only focus I had on the idea. Not the passenger side.

RustyRatRod said
Because exhaust DOES travel under the intake VIA the EGR passages and the exhaust cross over. Right?

Correct. Capping/sealing the area where the EGR valve is and now was stops the exhaust from going anywhere. At least that’s what I remember. I decided to go into the garage and see if I still had a EGR intake. I do not. I do not remember the exhaust gas being able to cross over if the valve was closed as well as after it’s removed and has a flat plate installed to prevent this.

92b said
I could be wrong but if I remember correctly the EGR should be closed at idle. I remember when I worked at the dealership diagnosing vehicles with a rough idle by using a screwdriver on the stem to pry open the egr valve and then letting it snap shut. Sometimes this would unstick a stuck valve or break up carbon in the seat of the valve causing it to seal back up.
If the plate is only sealed around the perimeter it could leak across the dividing wall. It doesn't take much for a vacuum leak especially if there is pressure on the exhaust side.

I’d say you would know better than me.

macdrew77 said
You know what I probably only put copper rtv around the outside, but i can't remember.

That could be a problem. The EGR gasket was that old very high temp material.