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Crankcases and PCV Valves

Basically, a crankcase is the casing for the crankshaft of an internal combustion engine. Combustion produces pressure within the crankcase. Positive crankcase ventilation (PCV) valves regulate the vapor pressure within the engine and recycle it back into the engine.

1,344 Questions

Where is PCV valve on 1990 Mustang 4 cylinder?

LOOK BEHIND THE ALTERNATOR THERE IS A SMALL HOSE RUNING FROM THE INTAKE TO IT IT IS SILVER WITH A BLACK HOSE ATTACHED TO IT

Does a Chevrolet S10 pickup have a pcv valve for a 4 cylinder?

I I have 98 s-10 with the 2.2 4 banger. I went to auto zone to do the first tune up on it a few years ago, and like aways that was on my list of things to get. They have the part number for it in the book, but they did not have one on the shelf or even a place for it on the shelf. So then me and my friend looked at my truck, and we could not find one for anything, so im kinda going with that it does not have one, unless its not located in the ussual place, on top of the valve cover.

I have a 1992 chevy S10 with a 4 banger and I've spent the six years I've owned it trying to find a PCV valve. I have always been too embarrest to ask anyone. I even bought one six years ago and it is still in the glove box! Finally one day I asked my father who has owned a chain of auto parts stores for 40+ years to try and find it. After laughing at me for a while, I finally asked him to show me where it is. What do you know... he couldn't find it either. This sparked a long research through all his parts books, and finally he found a foot note that mentions "most S10's of this vintage use a very common part #blah blah. but very few were built without PCV's" I guess you and I have one of those "very few."

I had an '88 jeep commanche pickup that had a massive oil leak on the top end when I bought it. At 65mph on the highway I blew out 6 quarts of oil in 20 miles of driving. I pressure washed the engine, started my tune up and found it had no PCV valve. I checked the books and the jeep uses a sealed crankcase system, even the oil fill cap has a gasket and it tightly screwed in place. I drilled a hole in the valve cover, installed a grommet and PCV valve, and spliced into a vacuum line to the intake manifold and never had another problem with oil leaking after that. I now have a '96 S-10 that has a valve cover leaking, looked for a PCV valve and cant find it. Looks like i'm drilling another hole.

Is there a trick to turn off the service engine soon light on a 99 Saturn Sc-1?

For most Saturns there is a button inside the under-hood fuse panel. With the key on and the engine off, press the button for 15 seconds and it should clear the code... I think. I have to refer to the manual whenever I do that so you may have to do the same.

What would cause both PCV hoses to split?

Hey Donna==The only thing I know of is old age. GoodluckJoe Old age and heat. Either or.

Why does your 305 idle ruff?

the answer is quite easy actually it falls into 3 catergories.timing is usually the first and best place to start,get a timing light and see where your timing is set,if it is outta time then correct it.secondly start by making sure your carbeurator is clean and operating the way it should be.is it delivering to much fuel or not enough make sure your fuel and air adjustments are correct especially on aftermarket carbs.and last but not least your camshaft,if it is an aftermarket cam and was installed professionally some cams are supposed to have a rough idle for instance.a crane cams energizer camshaft 272h thru 302h has a rough idle im using the 274h and atwith 274 degrees adv.duration and a gross lift of .450 degrees with an r.p.m range of about 1800-to 5800 i have a rough idle this is to be expected even if your an at home mechanic you should read about the cam you are using does it have smooth,good or rough idle they all work very efficently depending on your performance needs...

Where is the PVC valve on a 1998 Chrysler Town and Country v6 3.8 l engine?

I have a 97 Town and country LXI FWD with a 6 cylinder engine. If you are standing at the front of the vehicle looking at the engine, the PCV valve is on the left side of the engine under the intake runners. There is a long hose that runs all the way under the intake runners and then connects into the intake on the right side (there is an elbow right where it connects in).

V/R epo

What is engine carburetor?

The device that mixes the proper amount of fuel and air depending on the position of the accelerator. The mixture is then sent down the intake manifold to all cylinders. It allso sets the idle speed of the engine and increases the fuel/air mixture during a cold startup.

Where is the PCV valve on a 2001 Ford Focus 2.0L SP?

It is on the valve cover. on the firewall side to the right. (with you facing windshield) it is plastic, threaded in to the hole.

How do you change the PCV on a 2002 Jeep Liberty 3.7 engine?

it is located on the left of the oil filler cap.Pull the vacumm hose of and turn counter clockwise,then pull out.

Where is the PCV valve located on the 1995 Suzuki Sidekick?

I have a '94. Assuming it's in the same place, you will find it just to the left of the center of the engine as you are looking down on it from the front of the car. You'll see a rubber hose about 1/2" in diameter that connects into it. It should be very easily accessible, about as easy to remove as the dipstick.

Where does the pcv valve go on a 95 Nissan Pathfinder?

It is located on the air intake manifold. If you are standing at the front of the engine compartment, it is on the manifold at the top right hand side.

Where is the PCV valve on a 2005 Colorado?

I have a 2004, colorado, and it dont have a pcv valve, just a hose from the crank to the resonator.

Where should pcv hook up on carbed Chevy?

The pcv valve should be in a rocker cover with a hose going to a constant-vacuum source such as the base of the carb of a port in the intake manifold.

Do you need to replace a shower valve if you only want to change the exterior fixture?

no, you can buy a new shower head and install it. but if you want to change the controls you will probly have to buy a new unit. Unless you can cross reference the parts to see if they will fit. and you might be able to change the handle or know without changing the controls

What is the exup valve?

it is a valve that allows more back pressure at low rpm and less back pressure at high rpm. basically a computer controlled restriction in the exhaust right before the muffler. used in Yamaha r6's since 06? and r1 since 02? not sure on exact dates.

What happens If you have the PCV valve plugged off?

Positive Crankcase Ventilation (PCV). The PCV valve acts as a vent to the upper engine removing excess combustion gases via vacuum lines that plug into the valve. A dirty or restricted pcv valve and cause excess pressure on internal oil seals and gaskets.