Tuesday, October 18, 2011

Positive Crankcase Ventilation on cadillac?


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.


Click image to see an enlarged view
Fig. Fig. 1: Schematic of a common PCV system


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Fig. Fig. 2: Cross-section of a common PCV valve


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Fig. Fig. 3: PCV valve and hose between the rocker cover and throttle body - 1986-89 Eldorado and Seville


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Fig. Fig. 4: V6 PCV valve


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Fig. Fig. 5: View of a related emission hose - note the PCV valve is installed in the valve cover


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Fig. Fig. 6: Removing the PCV valve from the valve cover





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For more car related problem troubleshooting:---

This are the sections, you can go through and click the link to read its troubleshooting.

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The car will not start?

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Car will not crank?


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Car has no spark?


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How to troubleshoot car battery?

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How to test starter solenoid?

http://schematicsdiagram.blogspot.com/2011/06/how-to-test-starter-solenoid.html

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How to test cars starter?

http://schematicsdiagram.blogspot.com/2011/06/how-to-test-cars-starter.html

How to replace starter in car?



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car will turn over but will not start?



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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?

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How to replace Interior Lights on car?

Car lights not working, even after replacing the bulb/lamp?

Click this link below:--
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How to replace head lights on car?

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How to replace Parking, turn, and Brake Lights on car?

How to replace power window motor in car?

How to test relays on car?

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How to troubleshoot Engine Misfires?

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The spark plug firing order for car?

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Where is the Thermostat located in car?

How to recharge AC on Auto/Truck/car?

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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)



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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


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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?

How to change the outer door weather strip?


Car slows down when it gets hotter?


Warning lights on and speedometer died?



Car won't rev past 1900 rpms?



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