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PCV Location?

Alan D Learned
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Alan D Learned New Member

Alan D Learned

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Posted (edited)

I'm installing two oil catch cans, one on each side of the engine. My vehicle VIN is: 1GCUWDED8KZ130481

 

I noticed the passenger side breather hose was much oilier than the driver's side PCV hose. This makes me wonder where my PCV is actually located. My ride is a 2019 5.3 Liter Silverado 1500, RST, (New Style). I cannot get any two respondants to my query to agree with each other where the PCV is. Why is this so hard? Either it's on the left or it's  on the right side of the engine, attached to the TB or it's not, attached to the manifold or it's not. My future as an amateur automobile repair person hangs in the balance.

Edited by Alan D Learned
Did not include year of manufacture
Gangly Senior Enthusiast

Gangly

Posted
Posted

Your VIN shows a 2019 L84 (5.3)

 

On your 5.3, a closed crankcase ventilation system is used in order to provide a more complete scavenging of the crankcase vapors. Fresh air from the throttle body is supplied to the crankcase, mixed with blow-by gases, and then passed through a crankcase flow-controlled ventilation fitting into the intake manifold.

 

The primary control is through the crankcase ventilation fitting located in the front of the left rocker arm cover. This fitting is equipped with a flow control nozzle which meters the air flow at a rate depending on manifold vacuum. To maintain idle quality, the flow control nozzle restricts the flow when intake manifold vacuum is high. If abnormal operating conditions arise, the system is designed to allow excessive amounts of blow-by gases to back flow through the crankcase vent tube into the engine air inlet to be consumed by normal combustion.

 

Filtered fresh air is routed from the air inlet system to the front of the right rocker arm cover via a formed nylon tube. To reduce the potential of oil pullover due to back flow of the ventilation system, the fittings in the rocker arm covers are shielded from the rocker arms. From there fresh air and gases are routed through the crankcase and up through a metered PCV fitting on the front of the left rocker arm cover. Foul air is then routed into the left side of the intake manifold via a formed nylon tube."

Alan D Learned New Member

Alan D Learned

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I follow finally. Apparently based on my further reading on this subject my L84 model does not utilize PCVs per se, but opts instead for single-piece metal orifices resembling PCVs that redirect all gasses back up through the airbox plenum, manifold and subsequently the piston chambers bridging the two valve covers with appropriately sized rubber hoses, using a CSS ("cylinder support system") to the driver's side of the air plenum, and capping the passenger side of the plenum. This information went a very long way in explaining the mystery and offered a subsequent direction I need to go with my oil catch can connections. The direction of gasses would be better maintained with the judicious use of single direction check valves. Thanks!

Edited by Alan D Learned
Correction
KarenRoe New Member

KarenRoe

Posted
Posted (edited)
On 7/12/2023 at 3:08 AM, Gangly said:

Your VIN shows a 2019 L84 (5.3)

 

On your 5.3, a closed crankcase ventilation system is used in order to provide a more complete scavenging of the crankcase vapors. Fresh air from the throttle body is supplied to the crankcase, mixed with blow-by gases, and then passed through a crankcase flow-controlled ventilation fitting into the intake manifold.

 

The primary control is through the crankcase ventilation fitting located in the front of the left rocker arm cover. This fitting is equipped with a flow control nozzle which meters the air flow at a rate depending on manifold vacuum. To maintain idle quality, the flow control nozzle restricts the flow when intake manifold vacuum is high. If abnormal operating conditions arise, the system is designed to allow excessive amounts of blow-by gases to back flow through the crankcase vent tube into the engine air inlet to be consumed by normal combustion.

 

Filtered fresh air is routed from the air inlet system to the front of the right rocker arm cover via a formed nylon tube. To reduce the potential of oil pullover due to back flow of the ventilation system, the fittings in the rocker arm covers are shielded from the rocker arms. From there fresh air and gases are routed through the crankcase and up through a metered PCV fitting on the front of the left rocker arm cover. Foul air is then routed into the left side of the intake manifold via a formed nylon tube."

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Edited by KarenRoe

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