You need to replace the manifold and use Felpro Gaskets.
Intake manifold gasket leak....big problem with that engine. Sorry for the bad news.
It cost us about $700 cnd. That was a shop that charged about $75/hr.
under the intake manifold you have to remove the engine cover to get to it.
Intake manifold torque specifications for the Olds 403 is listed as 30 ft-lbs.
What are the intake manifold torque specs on 1998 Oldsmobile bravada?"
replace lower intake
The head gasket on a 1997 Oldsmobile Silhouette is located between the engine block and the cylinder head. Its primary function is to seal the combustion chambers and prevent coolant and engine oil from mixing. To access the head gasket, the intake manifold and cylinder head must be removed, which can be a complex process. It's essential to ensure the engine is cool and properly supported before attempting any repairs in this area.
it is located inside the intake manifold
The head gasket on an Oldsmobile Silhouette is located between the engine block and the cylinder head. It serves as a seal to contain the combustion process and maintain coolant and oil separation. To access the head gasket, you typically need to remove the intake manifold and other components, depending on the engine configuration. Always consult the vehicle's service manual for specific instructions and precautions during the replacement process.
The EGR (Exhaust Gas Recirculation) valve on an Oldsmobile Silhouette is typically located on the engine, often near the intake manifold. To find it, look for a metal or plastic component connected to a vacuum line and electrical connector. The exact location may vary depending on the specific engine model and year, so it's best to consult the vehicle's service manual for precise details.
Right where the intake hose attaches to the engine, between the bellowed tube and the intake manifold thing.
The intake manifold is where the air and fuel mix and enter the engine. The exhaust manifold is where unspent gas and air exit the engine. In other words the intake manifold is where the engine breathes in and the exhaust manifold is how the engine exhales out.