the upper platnium is bad most common cause
This explains it all. Leave it to the experts to mess everything up. http://www.autopartsdirecttoyou.info/?p=37
60 (5 valves for each of the 12 cylinders. Three of the valves on each cylinder are for intake and two are for exhaust.)
Channels air into the cylinders
6 cylinders
On a 1997 BMW 740i, the intake valves are located within the engine's cylinder heads, specifically for each of the eight cylinders in the V8 engine configuration. To access them, you would need to remove the intake manifold and other components that obstruct the cylinder heads. The intake valves are responsible for allowing air and fuel mixture into the combustion chambers during the intake stroke of the engine cycle.
It is where fuel and air enter the cylinders.
Either a warped head and blown headgasket or a cracked head. An intake gaslet will also blow and let it in on a 4.3. I had it happen.
the intake manifold is what draws in the air,separates and funnels it to the individual cylinders.
On every vehicle there are two manifolds. An intake manifold and a exhaust manifold. The intake supplies fuel and air to the cylinders. The exhaust collects exhaust from those same cylinders.
The 4.2 Liter is a V6 with 6 cylinders.
i had this problem the intake manifol gasket is blowed
Carry away exhaust gases from the engine. Intake carries a/f mix to cylinders.