Oil still going to intake manifold after changing pcv pathfinder
Pathfinder 2003 ,as oil was going to intake manifold i put a new pcv valve but oil continue to travel to intake manifold through it ,oil increased specialy after stopping enging and restarting after minutes too much smoke ,i heared that i should change the valve cover is that true.
now car shake too much in accelaration
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PCV valves allow the sump pressure to be sucked into the manifold when the vacuum gets past the point to open the valve
from your description of the problem
you have more than a pcv valve problem
more like badly worn rings and missing valve stem seals
The PCV valve is located under the intake manifold on the non-hybrid 2.5L engine. The intake manifold MUST be removed in order to service the PCV valve.
The PCV valve sits in the crankcase vent oil separator.
The PCV valve does not control the oil situation, it just keeps the pans and valve covers from blowing off during a backfire. Excessive Oil in the breather is a result of excessive crankcase pressures, usually due to a worn engine, specifically rings.
SOME oil is normal, especially if you are loaded heavily and hard on the throttle.
There is a tester that measures crankcase pressures, but usually some other manifestation shows, like excessive oil consumption.
the PCV system draws crankcase fumes into the intake at idle and lower throttle situations. air going into the crankcase is filtered by the small PCV filter, where the oil shows up....
At highter throttle and lower intake manifold pressures, the system reverses, the PCV valve closes, and the fumes exit the crankcase VIA the breather filter. All of this is normal.
It costs tons less to periodically clean or replace the PCV filter.
possible bad rings, i would put some motor tune-up in oil will clean carbon off rings, its made by company called seaform and is called motor tune-up, put hole can in oil and drive for about 30 days ,its good stuff can also use in fuel to clean injectors, could also have worn out valve stem seals causing oil to leak pass valves into cyl
The PCV valve can be located in several places. The most common location is in a rubber grommet in the valve cover. It can be installed in the middle of the hose connections, as well as installed directly in the intake manifold.
Once the PCV valve is located, make sure all the PCV system hoses are properly connected and that they have no breaks or cracks.
Remove the air cleaner and inspect the air and crankcase filters. Crankcase blowby can clog these with oil. Clean or replace such filters.
Oil in the air cleaner assembly indicates that the PCV valve or hoses are plugged.
Make sure you check these and replace the valve and clean the hoses and air cleaner assembly.
When the PCV valve and hose are in satisfactory condition and there is oil in the air cleaner assembly, perform a cylinder compression test to check for worn cylinders and piston rings.
The PCV valve is located in the valve cover on the passenger side of the vehicle. The valve is closer to the firewall than it is to the front of the engine. It has a hose attached to it and threads into the valve cover.
Nissan Scope Technician- 10+ years experience is Nissan dealership