The pan covers the exhaust crossover passage, which heats the bottom of the carburetor for fast warm ups in cold starts. The passage gets hot, so this pan shields the crank case and oil from the heat. -MJS
A cracked fuel line in the intake manifold will spray fuel into the manifold where it drains into the oil pan or a fuel pressure regulator with a bad diaphragm will allow fuel to flow into the vacuum line that attaches to the regulator to let it meter more fuel under acceleration this fuel also winds up in the oil pan.
The knock sensors(2) are in the valley pan beneath the intake manifold
to keep the intake manifold cooler by keeping the hot oil off the underside of it.
Back of the engine, below the intake manifold. To reach it, you have to be under the car with your head near the firewall. Look up over the rear of the oil pan.
There will be a hole in the valley pan under the intake manifold. This takes a rubber grommet that the PCV goes into. Then the hose runs to either the large port on the carb, or there should also be a port in the intake runner that it can hook to.
If its the same as my 95 eldorado (4.6 northstar) you need to remove the intake manifold , the starter is in the valley pan.
Yes, you will need to install the 1997 oil pan and intake manifold.
It can be a few things, turbo seals leaking faulty crankcase valve faulty bell pan.
In a 2003 Nissan Frontier XE V6, the knock sensor is typically located on the engine block, specifically on the passenger side, near the intake manifold. It is positioned below the intake manifold and above the oil pan, making it somewhat challenging to access. You may need to remove the intake manifold to reach it effectively.
Intake manifold valley pan gasket is leaking. Happened to my 99. Remove the intake and change the gasket that seals the flat pan to its bottom.
The oil filter is on the back of the engine. If you are under the car and under the oil pan u should be able to see your filter. Reach over the top of the engine and twist the filter to your right. It is right below the intake manifold of your car.
Start with removing the intake manifold. If it still not found you will have to drop the oil pan. If it made it's way to the bottom of the oil pan it would be harmless, but you will not know.