Your erg valve is installed upside down and backwards. The same thing happend to me.
You need to replace the manifold and use Felpro Gaskets.
Under hood, center, rear engine area, mounted in exhaust manifold
It cost us about $700 cnd. That was a shop that charged about $75/hr.
Intake manifold gasket leak....big problem with that engine. Sorry for the bad news.
Intake manifold gasket seems to go on every single van, anywhere between 60k and 150k. This van has a host of cooling/transmission issues.
What are the intake manifold torque specs on 1998 Oldsmobile bravada?"
Auto Zone says it's located on the driver's side intake manifold. I've not found it yet on my 95. Maybe you will have better luck!, if so post a response please.
I found mine on the front center of the engine right by the exhaust manifold shield, it has a black protector cap to unscrew from it. You will need to use a long hose for reaching it from a freon can.
Screwed into the exhaust manifold.Screwed into the exhaust manifold.
on the front of a 4 cylider engine
under the intake manifold you have to remove the engine cover to get to it.
Remove the intake manifold. The starter is underneath.