Pcv valve
Junior Member
Joined: Jun 2013
Posts: 89
Likes: 0
From: SW Virginia
Year: 1999
Model: Cherokee
Engine: 4.0L
Yes it does.
Any vehicle has to have some type of breather/PCV valve. Otherwise the crankcase pressure would build up and have nowhere to go until it pushed a seal out or the next weakest link such as the oil dipstick.
PCV= Positive Crankcase Ventilation. The crankcase has to vent due to blowby. If you have a non functioning valve or no way for the crankcase to vent, you are going to have problems.
Any vehicle has to have some type of breather/PCV valve. Otherwise the crankcase pressure would build up and have nowhere to go until it pushed a seal out or the next weakest link such as the oil dipstick.
PCV= Positive Crankcase Ventilation. The crankcase has to vent due to blowby. If you have a non functioning valve or no way for the crankcase to vent, you are going to have problems.
Herp Derp Jerp
Joined: Nov 2011
Posts: 18,251
Likes: 17
From: Parham, ON
Year: 1999
Model: Cherokee
Engine: 4.0L OBD-II
The Jeep 4.0L is not equipped with a PCV valve. The engine is features a valveless CCV system ("constant crankcase ventilation") that has air always moving through it. On your valve cover, the forward elbow has a hose that draws in clean air from the filter. The rearward elbow contains a "metered orifice" (tiny hole). The hose on this elbow runs to a fitting on the intake maniold. This is a slightly older design.
There is no PCV valve. However when parts shopping many books and computers have the elbows mislabelled.
There is no PCV valve. However when parts shopping many books and computers have the elbows mislabelled.
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CF Veteran
Joined: Oct 2012
Posts: 2,314
Likes: 3
From: Canton, GA
Year: 1996
Model: Cherokee
Engine: 4.0
::CF Moderator::
Joined: Aug 2011
Posts: 43,971
Likes: 1,579
From: Prescott, Az
Year: 1990
Model: Cherokee (XJ)
Engine: 4.0
Yes it does.
Any vehicle has to have some type of breather/PCV valve. Otherwise the crankcase pressure would build up and have nowhere to go until it pushed a seal out or the next weakest link such as the oil dipstick.
PCV= Positive Crankcase Ventilation. The crankcase has to vent due to blowby. If you have a non functioning valve or no way for the crankcase to vent, you are going to have problems.
Any vehicle has to have some type of breather/PCV valve. Otherwise the crankcase pressure would build up and have nowhere to go until it pushed a seal out or the next weakest link such as the oil dipstick.
PCV= Positive Crankcase Ventilation. The crankcase has to vent due to blowby. If you have a non functioning valve or no way for the crankcase to vent, you are going to have problems.
CF Veteran
Joined: Mar 2010
Posts: 47,923
Likes: 38
From: Broward County Fl.
Year: 1989 xj sport 2dr
Model: Cherokee
Engine: 12 hole bosch Injectors
I can vouch oil blowing out of dipstick because of plugging all hose. Trying to eliminate thing when people don't know what there doing .
CF Veteran
Joined: Mar 2010
Posts: 47,923
Likes: 38
From: Broward County Fl.
Year: 1989 xj sport 2dr
Model: Cherokee
Engine: 12 hole bosch Injectors
The Jeep 4.0L is not equipped with a PCV valve. The engine is features a valveless CCV system ("constant crankcase ventilation") that has air always moving through it. On your valve cover, the forward elbow has a hose that draws in clean air from the filter. The rearward elbow contains a "metered orifice" (tiny hole). The hose on this elbow runs to a fitting on the intake maniold. This is a slightly older design.
There is no PCV valve. However when parts shopping many books and computers have the elbows mislabelled.
There is no PCV valve. However when parts shopping many books and computers have the elbows mislabelled.
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