Positive Crankcase Ventilation
OPERATION
All engines covered in this guide are equipped with a positive crankcase ventilation (PCV) system to control crankcase blow-by vapors. The system functions as follows:
When the engine is running, a small portion of the gases which are formed in the combustion chamber leak by the piston rings and enter the crankcase. Since these gases are under pressure, they tend to escape from the crankcase and enter the atmosphere. If these gases are allowed to remain in the crankcase for any period of time, they contaminate the engine oil and cause sludge to build up in the crankcase. If the gases are allowed to escape into the atmosphere, they pollute the air with unburned hydrocarbons. The job of the crankcase emission control equipment is to recycle these gases back into the engine combustion chamber where they are reburned.
The crankcase (blow-by) gases are recycled in the following way: as the engine is running, clean, filtered air is drawn through the air filter and into the crankcase. As the air passes through the crankcase, it picks up the combustion gases and carries them out of the crankcase, through the oil separator, through the PCV valve, and into the induction system. As they enter the intake manifold, they are drawn into the combustion chamber where they are reburned.
The most critical component in the system is the PCV valve. Located in the valve cover or intake manifold, this valve controls the amount of gases which are recycled into the combustion chamber. At low engine speeds, the valve is partially closed, limiting the flow of the gases into the intake manifold. As engine speed increases, the valve opens to admit greater quantities of the gases into the intake manifold. If the valve should become blocked or plugged, the gases will be prevented from escaping from the crankcase by the normal route. Since these gases are under pressure, they will find their own way out of the crankcase. This alternate route is usually a weak oil seal or gasket in the engine. As the gas escapes by the gasket, it also creates an oil leak. Besides causing oil leaks, a clogged PCV valve also allows these gases to remain in the crankcase for an extended period of time, promoting the formation of sludge in the engine. **see Section** 1 for PCV valve replacement intervals.
SERVICE
See Figures 1, 2, 3, 4, 5 and 6
Slow, unstable idling, frequent stalling, oil leaks, and oil in the air cleaner are all signs that the PCV valve may be clogged or faulty. Follow the PCV valve testing procedure in Routine Maintenance and replace the valve if necessary. Check the valve at every tune-up. Remove the valve by gently pulling it out of the valve cover or manifold, then open the clamp on the hose end with a pair of pliers. Hold the clamp open while sliding it an inch or two down the hose (away from the valve), and then remove the valve. If the end of the hose is hard or cracked where it holds the valve, it may be feasible to cut the end off if there is plenty of extra hose. Otherwise, replace the hose. Replace the grommet in the valve cover if it is cracked or hard, and replace the clamp if it is broken or weak. In replacing the valve, make sure it is fully inserted in the hose, that the clamp is moved over the ridge on the valve so that the valve will not slip out of the hose, and that the valve is fully inserted into the grommet in the valve cover.
------------
For more car related problem troubleshooting:---
This are the sections, you can go through and click the link to read its troubleshooting.
---------
The car will not start?
-----------------
Car will not crank?
-----------
Car has no spark?
-------------
How to troubleshoot car battery?
-----------------
How to test starter solenoid?
http://schematicsdiagram.blogspot.com/2011/06/how-to-test-starter-solenoid.html
--------------------
How to test cars starter?
http://schematicsdiagram.blogspot.com/2011/06/how-to-test-cars-starter.html
How to replace starter in car?
-----------
car will turn over but will not start?
-----------------
The Brake Indicator Light Stays On dash of car?
The ABS and Traction Control Lights stays ON dash of car?
Check Engine Light On car?
-------------------------
How to replace Interior Lights on car?
Car lights not working, even after replacing the bulb/lamp?
Click this link below:--
---------------
How to replace head lights on car?
--------------------
How to replace Parking, turn, and Brake Lights on car?
http://schematicsdiagram.blogspot.com/2011/06/how-to-replace-parking-turn-and-brake.html
How to remove the door panel on car?
How to remove the door panel on car?
How to replace power window motor in car?
How to test relays on car?
-----------------------------
How to troubleshoot Engine Misfires?
------------
The spark plug firing order for car?
------------------------
Where is the Thermostat located in car?
How to recharge AC on Auto/Truck/car?
-------------------
How to trouble shoot speedometer?
To Order car parts online:--To get heavy discount on car parts .Click this link below:----
How to Replace Coil Springs?
How to Replace an Oil Pan Gasket?
How to Replace a Fuel Injector
How to Replace a C.O.P. Type Ignition Coil?
How to Replace a Fuel Pressure Regulator?
How to Replace a Fuel Pump?
How to Replace a Rear Lift Gate Locking Mechanism?
How to Clean a Fuel System
How to Replace an Ignition Coil
How to Replace a Windshield
How to Replace a Mass Air Flow Sensor
How to Replace a Rear Distance Sensor
How to Replace a Muffler
How to Replace an Engine
How to Replace an Intake Manifold Gasket
How to Replace an Oil Pump
How to Lubricate a Brake Pedal Linkage ?
How to Replace a Windshield Wiper Motor
How to Replace a Distributor Cap
How to Replace a Door Weather Stripping
How to Replace a Freeze Plug
How to Replace a Head Gasket
How to Replace a Heater Core
How to Replace Spark Plugs?
How to Replace a Rear Axle Bearing?
How to Replace a Front Bumper Cover
How to Replace a Manual Transmission
How to Replace a Headlight Bulb
How to Replace a Headlight Switch
How to Replace Windshield Wiper Blades
How to Replace a Cooling Fan
How to Replace a Catalytic Converter
How to Replace an Engine Mount
How to Replace a Fog Light Assembly
How to Change Engine Oil and Filter
How to Replace a Power Seat Switch
How to Replace a Rear Main Seal
How to Repair a Defroster Grid
How to Replace an AWD Transfer Case
How to Replace a Plastic License Plate Bracket?
How to Replace a Power Seat Motor
How to Replace Power Steering Fluid
How to Replace a Power Window Switch
How to Replace a Quarter Glass Panel?
How to Pressure Test a Radiator and Cap
How to Replace a Radiator
How to Repair a Hood.
How to Replace an Energy Absorber
How to Replace Heater Core Hoses
How to Replace a Thermostat.
How to Rotate Tires.
How to Replace Wheel Lug Nuts
How to Replace a Tire Valve Stem
How to Change a Flat Tire
How to Replace Leaf Springs
How to Replace a Heater Control Valve
How to Replace Transmission Cooler Lines
How to Replace an Ignition Control Unit
How to Replace a Brake Hose
How to Replace a Transfer Case Rear Output Seal
How to Replace a Seat Belt and Seatbelt Retractor
How to Replace a Power Steering Rack
How to Bleed Brakes with a Tool
How to Replace a Tail Light Bulb
How to Check Automatic Transmission Fluid Level
How to Change Automatic Transmission Fluid and Filter
How to Replace Vacuum Hoses
How to Replace an Air Intake Boot
How to Replace a Valve Cover Gasket
How to Replace a Water Pump
How to Replace a Windshield Wiper Switch
How to Replace Window Run Channel Seals
How to Replace a Window Regulator
How to Balance a Tire and Wheel
How to Replace a Window Motor
How to Adjust a Hood Release Latch?
How to Replace a Radiator Support
How to Replace a Rear Pinion Seal.
How to Replace Battery Cables
How to Replace a Proportioning Valve
How to Replace an Upper Radiator Hose
How to Replace a Lower Radiator Hose
How to Replace a Timing Belt?
How to Check for Loose or Worn Suspension
How to Check for Loose Steering System
How to Replace an Oil Pressure Switch (Sensor)
How to Replace a Fender Liner or Splash Shield
How to Replace a Hood Insulator
How to Replace a Rear Differential.
How to Repair a Hood Hinge
How to Replace a Brake Pedal Return Spring
How to Replace a Door Shell.
How to Replace a Transfer Case Front Output Seal
How to Replace a Hood Latch/Lock Assembly
How to Replace a Lift Gate Strut
How to Replace Mud Flaps (Mud Guards)
How to Check Differential Oil Leaks and Replace Oil.
How to Replace a Mirror
How to Replace a Transfer Case Shift Linkage
How to Replace a Transmission Mount
How to Replace a U-Joint
How to Replace a Washer Tank
How to Replace an A/C Line or Hose
How to Replace a Heater and A/C Blower Motor
How to Replace an ABS Control Unit
How to Perform a Brake Adjustment
How to Replace an Alternator Belt
How to Replace an Emblem
How to Replace an Exhaust Manifold Gasket
How to Replace a Tail Pipe
How to Replace Shock Absorbers
How to Replace a Strut Assembly
How to Replace a Driveshaft
How to Replace a Wheel Cylinder
How to Replace a Hood
How to Replace a Brake Disc (Rotor)
How to Replace a Metal License Plate Bracket
How to Replace a Power Steering Pump
How to Perform a Basic Engine Tune-Up
How to Perform a Basic Engine Tune Up-Oil Change
How to Perform a Basic Engine Tune Up-Spark Plug and Wire Change
How to Replace a Distributor Cap and Rotor ?
How to Repair a Valance
How to Replace a Turn Signal Switch
How to Replace a Plastic Bumper Cover
How to Replace a Parking Brake Cable
How to Replace Windshield Wiper Blade Refills
How to Replace a Corner Light
How to Replace a Bumper Bracket or Side Support
How to Replace a Washer Pump.
How to Replace a Grille
How to Replace a Locking Hub
How to Replace a Fender
How to Replace a Power Steering Hose
How to Replace a Tailgate
How to Replace a Soft Top
How to Replace a Carburetor
How to Replace a Bumper Trim
How to Replace Trunk Strut
How to Replace a Front End Cover
How to Replace a Front Pipe
How to Replace an Antenna Mast
How to Replace a Side Marker Light Assembly
How to Install a Carpet on car?
How to Replace a Spoiler
How to Replace a Mirror Glass on car?
How to Replace a Step Bumper?
How to Replace a Door Lock
How to Replace a Throttle Body
How to Replace a Throttle Position Sensor
How to Replace a Grille Insert
How to Replace a Fan Shroud Assembly
How to Replace an Engine Splash Shield
How to Replace a Turn Signal Light Assembly
How to Replace a Headlight Assembly
How to Replace a Park Light Assembly
How to Replace an Expansion Tank
How to Replace an Exhaust System
How to Replace a Fender Trim
How to Replace a Headlight Door
How to Replace a Fan Shroud
How to Replace a Harmonic Balancer
How to Replace a Header Panel
How to Replace a Fuel Tank
How to Replace a Fuel Tank Cap
How to Replace a Distributor
How to Replace an EGR Valve
How to Replace an Oxygen Sensor
How to Replace an Ignition Wire Set
How to Replace a Tail Light
How to Replace a Door Handle
How to Replace a Hood Strut
How to Replace Tail Light Assembly
How to Replace a Front Bumper
How to Replace a Fuel Pump Assembly
How to Replace an Axle Assembly
How to Replace a Tailgate Handle
How to Replace a Wheel Hub Assembly
How to Replace a Control Arm
How to Replace a Window Regulator with Motor
How to Replace a Headlight
How to Check the Brake Fluid Level
How to Replace a Parking Brake Switch
How to Replace a Blower Motor Resistor
How to replace frost plug on car?
Horn stopped working?
How to clean egr valve on Isuzu Amigo?
Cruise control stopped working?
Car is stuck in park and the shift will not move?
No comments:
Post a Comment