What is the purpose of the Positive Crankcase Ventilation (PCV) system and PCV Valve on Chevrolet Express?

To reduce hydrocarbon emissions, the Positive Crankcase Ventilation (PCV) system scavenges crankcase vapors rich in unburned hydrocarbons. Rather than using intake manifold vacuum for this purpose, as it happens in the conventional PCV systems; however, the system in these vehicles does not. It is done by connecting a fresh air inlet hose from the air intake duct or resonator box straight to valve cover, which allows pressure equalization by fresh air. There is another hose that draws in crankcase vapors by connecting the left valve cover to the intake manifold. Based on intake vacuum levels, PCV valve controls vapor flow into intake manifold. The engine model determines how a particular PCV system is configured. When servicing an engine, the hoses of its PCV system should be checked for any damage or clogs as well as leaks. Rough idling, stalling, high or low idle speeds, oil leaks and sludge buildup may all occur due to blocked or leaking hoses. Vacuum presence in the PCV hose can be tested very simply checking vacuum gauge readings at different stages of running and diagnosing such problems as leaks blockages or excessive crankcase pressure which influence PCV system work.

Genuine Chevrolet Express PCV Valve

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5 PCV Valves found

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Chevrolet Express Valve Asm,Pcv
Part Number: 19303069
$3.60 MSRP: $6.54
You Save: $2.94 (45%)
Ships in 1 Business Day
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Product Specifications
- Other Name: VALVE, Engine Crankcase; PCV Valve
- Replaces: 06487532, 6487532
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 1996-2004 Chevrolet Express | 1 TON CARGO EXPRESS, 1 TON COMMERCIAL/RECREATIONAL VEHICLE EXPRESS, 1 TON PASSENGER, 1/2 TON CARGO EXPRESS, 1/2 TON PASSENGER EXPRESS, 3/4 TON CARGO EXPRESS, 3/4 TON PASSENGER EXPRESS | 6 Cyl 4.3L, 8 Cyl 5.0L, 8 Cyl 5.7L, 8 Cyl 7.4L
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Chevrolet Express Valve, Crankcase Depression Regulator
Part Number: 25097699
$85.31 MSRP: $153.02
You Save: $67.71 (45%)
Ships in 1-3 Business Days
ADD TO CART
Product Specifications
- Other Name: VALVE, Engine Crankcase; PCV Valve
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 1996-2002 Chevrolet Express | 1 TON CARGO EXPRESS, 1 TON COMMERCIAL/RECREATIONAL VEHICLE EXPRESS, 1 TON PASSENGER, 3/4 TON CARGO EXPRESS, 3/4 TON PASSENGER EXPRESS | 8 Cyl 6.5L Diesel
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Chevrolet Express Valve Assembly, Crankcase Depression Regulator
Part Number: 12642205
$24.65 MSRP: $46.50
You Save: $21.85 (47%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Other Name: VALVE, Engine Crankcase
- Replaces: 12633286
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2010-2016 Chevrolet Express | 1 TON CARGO EXPRESS, 1 TON CARGO SAVANA, 1 TON COMMERCIAL/RV CUTAWAY, 1 TON PASSENGER, 3/4 TON CARGO EXPRESS, 3/4 TON CARGO SAVANA, 3/4 TON PASSENGER EXPRESS, 3/4 TON PASSENGER SAVANA | 8 Cyl 6.6L Diesel
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Chevrolet Express Valve Assembly, Pcv
Part Number: 12630887
$8.39 MSRP: $15.26
You Save: $6.87 (46%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Other Name: VALVE, Engine Crankcase; PCV Valve
- Replaced by: 12691877
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2018-2021 Chevrolet Express | 1 TON CARGO EXPRESS, 1 TON COMMERCIAL/RV CUTAWAY, 1 TON PASSENGER, 3/4 TON CARGO EXPRESS, 3/4 TON PASSENGER EXPRESS | 6 Cyl 4.3L
View related parts
Chevrolet Express Fitting,Pcv
Part Number: 12572717
Product Specifications
- Other Name: VALVE, Engine Crankcase; PCV Valve
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2003 Chevrolet Express | 1 TON CARGO EXPRESS, 1 TON PASSENGER, 1/2 TON CARGO EXPRESS, 1/2 TON PASSENGER EXPRESS, 3/4 TON CARGO EXPRESS, 3/4 TON PASSENGER EXPRESS | 8 Cyl 4.8L, 8 Cyl 5.3L, 8 Cyl 6.0L

Chevrolet Express PCV Valve Parts Questions & Experts Answers

Valve Asm,Pcv
19303069
Q: What is the purpose of the Positive Crankcase Ventilation (PCV) system and PCV Valve on Chevrolet Express?
A: To reduce hydrocarbon emissions, the Positive Crankcase Ventilation (PCV) system scavenges crankcase vapors rich in unburned hydrocarbons. Rather than using intake manifold vacuum for this purpose, as it happens in the conventional PCV systems; however, the system in these vehicles does not. It is done by connecting a fresh air inlet hose from the air intake duct or resonator box straight to valve cover, which allows pressure equalization by fresh air. There is another hose that draws in crankcase vapors by connecting the left valve cover to the intake manifold. Based on intake vacuum levels, PCV valve controls vapor flow into intake manifold. The engine model determines how a particular PCV system is configured. When servicing an engine, the hoses of its PCV system should be checked for any damage or clogs as well as leaks. Rough idling, stalling, high or low idle speeds, oil leaks and sludge buildup may all occur due to blocked or leaking hoses. Vacuum presence in the PCV hose can be tested very simply checking vacuum gauge readings at different stages of running and diagnosing such problems as leaks blockages or excessive crankcase pressure which influence PCV system work.