Posted on 12/5/2016
Hello Los Altos it's Duke again! Did you know that the first federally mandated emissions control device was introduced in the 1960's? The Positive Crankcase Ventilation valve, or PCV valve, has been installed in CA vehicles since 1964 and represents the first legislation by the United States government to regulate harmful emissions as well as to improve in the country's vehicles. Well I guess you barked it, we are going to bark about PCV Valve Service today!
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The PCV valve, as you can probably guess, is located on the crankcase. The crankcase is the lowest part of a vehicle's engine. It houses the crankshaft and the engine oil. The crankshaft connects to the pistons that power the engine.
Pistons are pushed down when fuel is burned in an engine. This causes the crankshaft to rotate, which sends power to the transmission, which ultimately turns the axles and causes the vehicle to move. Some of the gases released by the burning fuel squeeze around the pistons and down into the crankcase.
If the escaped gases mix with the engine oil in the crankcase, oil sludge develops. This sludge has the consistency of petroleum jelly and can cause damage by clogging up passageways in the engine. Further, escaped gases can build up pressure inside the crankcase that can blow out seals and gaskets.
Before 1964, a hose was attached to the crankcase that vented escaped gases out into the air. These gases contained about 70% unburned fuel, as well as harmful emissions. The PCV valve was designed to curb these harmful emissions as well as recapture unburned fuel.
The PCV valve is a small, one-way valve that allows escaped gases to exit the crankcase. The gases are then routed into the intake system so they can be re-burned in the engine. Fresh air enters the crankcase through a breather tube to facilitate this circulation and keep the air in the crankcase clean.
The PCV valve, like most working parts on a vehicle, will wear out over time. Usually it simply gets gummed up. Preventive maintenance, including routine oil changes at Allied Auto Works in Los Altos, will extend the life of the valve, but eventually it will have to be replaced. A sticking PCV valve won't allow gases to circulate properly, which can increase pressure in the crankcase. Over time, that pressure will lead to oil leaks.
Your vehicle manufacturer recommends that a PCV valve be replaced every twenty to fifty thousand miles, depending on the vehicle and Los Altos driving conditions. It's an inexpensive repair, but may not be included in the maintenance schedule in your owner's manual, so if you're looking for auto advice about the PCV valve, you may have to ask our pros, Matt and Travis at Allied Auto Works.
Taking care of our PCV valve protects the environment in CA, and improves vehicle performance. It's just part of good car care for Los Altos drivers, and a way that all of us can do our part to improve the world we live in.
Duke 
Allied Auto Works
2073 Grant Road
Los Altos, CA 94024
650.968.7227
http://www.alliedautoworks.com
Posted on 2/22/2016
Whenever we talk about exhaust service, most people normally think about exhaust pipes and mufflers. Well, actually, exhaust service is a lot more comprehensive these days. For example, catalytic converters were mandated in 1976 and on-board emission control computers in 1990. Governmental emissions requirements have forced manufacturers to come up with much more sophisticated ways to comply with environmental regulations.
Exhaust service has really become exhaust and emissions service. High-tech computer controlled emissions devices are now a big part of exhaust service. Because it is so sophisticated, your vehicle manufacturer recommends you have your emission system checked out by a qualified Los Altos exhaust technician regularly to make sure everything is working right - usually every 6 months or 10,000 miles/16,000 kilometers.
If your Check Engine light comes on, especially if it's flashing, get your car looked at right away. Technicians at Allied Auto Works handle emission problems everyday. You might have exhaust or emissions trouble if your car is difficult to start, runs rough, is noisy or smoking. Call Allied Auto Works at 650.968.7227 to schedule an appointment if you experience these problems.
Let's review the exhaust system. We will start from the top and start with the exhaust manifold. That is the part that attaches to the engine and collects the exhaust from the cylinders and directs it into the exhaust pipe. Exhaust gaskets help seal the connection with the manifold and various other joints along the way. If the manifold is cracked or loose, or a gasket is leaking, dangerous gases could escape into the passenger compartment, where you ride. Carbon monoxide can be deadly, so it is important that your exhaust system doesn't leak. The exhaust pipes connect the various components. They can rust or be damaged by a rock, so they need to be inspected periodically.
Next is the catalytic converter. This part looks like a muffler. It changes chemicals that are dangerous to your health and the environment into harmless carbon dioxide and water. It doesn't require any maintenance itself. But eventually they wear out. You will find this out when your car fails an emissions inspection.
Now the muffler. Its main job is to quiet engine noises. Mufflers work by either absorbing or baffling sound. And you can actually customize your car's sound with different mufflers - anything from whisper quiet to bad-boy rumbley. Rusted or road-damaged mufflers can leak and need to be replaced right away.
The exhaust system is attached to the car by a series of hangers and clamps. These fasteners hold the system in place. When hangers come loose or break, hot exhaust components can touch and melt wires, hoses and lines.
Finally, we end at the tailpipe. This is the final outlet for the exhaust. These can be plain-Jane or pretty flashy. Also, the oxygen sensors monitor the oxygen content of the exhaust so the engine control computer can adjust the fuel-to-air mix to keep the car running right.
Exhaust and emissions service covers plain old pipes and high-tech computers. It impacts everything from life and death safety due to exhaust leaks, to fine-tuning the sound of your ride.
Posted on 6/3/2015


Hi Cayenne here and I am just exhausted thinking about the exhaust system but it is important. So here goes!
Your sedan’s exhaust system is more than just a tailpipe and a muffler. In fact, it is one of the most complex systems on your sedan. Maintaining it is good Allied Auto Works auto advice for Los Altos drivers, but it’s also good health advice and good environmental advice.
The exhaust system includes your emissions system. Because this system may affect your health and the health of our Los Altos area environment, it is subject to strict government regulations. Satisfying these regulations demands some high-tech, computer-controlled equipment, which means that the emissions system is a lot more sophisticated than it was thirty years ago. Most vehicle manufacturers recommend that you have your sedan exhaust and emissions systems checked by a qualified technician at regular intervals.
The exhaust system starts with the exhaust manifold.
The manifold is attached to the sedan engine. It collects exhaust from the cylinders and directs it into the exhaust pipe. Gaskets seal the connection of the manifold to the engine and to other joints. A cracked or loose manifold or a leaking or damaged gasket can allow dangerous gases to enter the passenger compartment of a vehicle. One of these gases is carbon monoxide, which is colorless, odorless and deadly. For this reason, it is critical that Los Altos drivers keep their exhaust system in good repair.
The pipes that connect the various parts of the exhaust system can rust or be damaged by rocks or other road debris. Such damage can cause dangerous gases to leak into the air. So it is essential that exhaust pipes get a diagnostic examination regularly.
The catalytic converter is the next vital component of your sedan exhaust system. It sort of looks like a muffler. Its job is to change dangerous gases into harmless carbon dioxide and water. The catalytic converter doesn’t require any regular maintenance, but it can wear out. If it fails, you will need a new catalytic converter to pass an emissions test in CA. Call Allied Auto Works at 650.968.7227 if you suspect a problem with your catalytic converter.
Oxygen sensors in the exhaust pipe monitor the oxygen content of the exhaust. This helps the sedan engine’s computer keep the fuel-to-air mixture at optimal levels.
The muffler is also part of your sedan exhaust system, but it deals with a different kind of emission. It keeps your sedan from emitting bad sounds. Mufflers act like finely tuned musical instruments. They create a feedback of sound waves to absorb or decrease the noises made by your engine. Different mufflers can create different sound waves, so you can actually “tune” your car to produce a particular sound, anything from whisper to rumble.
It is critical for damaged mufflers be replaced immediately at your Los Altos automotive service center, especially if they are leaking. Not only will the extra noise annoy your Los Altos neighbors, a leaky muffler could be serious.
The entire exhaust system is attached to your sedan by hangers and clamps. These fasteners can rust, come loose or break. The critical components of the exhaust system can get very hot, so when the hangers or clamps fail, these hot components can come into contact with other parts such as wires and hoses. These can melt, causing serious and expensive damage to your vehicle. Good car care requires that you have your exhaust system inspected regularly.
Let’s not forget the tailpipe. It’s the last vital piece in the exhaust system — and of your sedan, for that matter. Exhaust fumes exit your sedan through the tailpipe.
If your sedan has any of the following symptoms, it may have a problem with the exhaust system: it’s hard to start, it runs rough, it’s noisy, it’s smoking. Also, if your “check engine” light comes on, especially if it’s flashing, it is important to get your sedan to Allied Auto Works in Los Altos right away. Often, the “check engine” light indicates a problem with the emissions system.
Caring for your sedan exhaust system yields cosmetic benefits like quieting your engine sounds, but also may impact your health and safety. Your life, or the life of a loved one, may actually be on the line.
Well go out and get the exhaust system checked today!
Cayenne
Posted on 6/14/2013
Whenever they hear the term "exhaust service," most Los Altos people think about exhaust pipes and mufflers. Well, actually, exhaust service at Allied Auto Works is a lot more comprehensive these days. For example, catalytic converters were mandated in 1976 and on-board emission control computers in 1990. Governmental emissions requirements have forced car makers to come up with much more sophisticated ways to comply with environmental regulations.
Exhaust service has really become exhaust and emissions service. High-tech computer controlled emissions devices are now a big part of exhaust service. Because it is so sophisticated, your vehicle manufacturer recommends you have your emission system checked out by a qualified Los Altos exhaust technician regularly to make sure everything is working right - usually every 6 months or 10,000 miles/16,000 kilometers.
If your Check Engine light comes on, especially if it's flashing, get your car looked at right away. Technicians at Allied Auto Works handle emission problems everyday. You might have exhaust or emissions trouble if your car is difficult to start, runs rough, is noisy or smoking. Call Allied Auto Works at 650.968.7227 to schedule an appointment if you experience these problems.
Let's review the exhaust system. We will start from the top and start with the exhaust manifold. That is the part that attaches to the engine and collects the exhaust from the cylinders and directs it into the exhaust pipe. Exhaust gaskets help seal the connection with the manifold and various other joints along the way. If the manifold is cracked or loose, or a gasket is leaking, dangerous gases could escape into the passenger compartment, where you ride. Carbon monoxide can be deadly, so it is important that your exhaust system doesn't leak. The exhaust pipes connect the various components. They can rust or be damaged by a rock, so they need to be inspected periodically.
Next is the catalytic converter. This part looks like a muffler. It changes chemicals that are dangerous to your health and the environment into harmless carbon dioxide and water. It doesn't require any maintenance itself. But eventually they wear out. You will find this out when your car fails an emissions inspection.
Now the muffler. Its main job is to quiet engine noises. Mufflers work by either absorbing or baffling sound. And you can actually customize your car's sound with different mufflers - anything from whisper quiet to bad-boy rumbley. Rusted or road-damaged mufflers can leak and need to be replaced right away.
The exhaust system is attached to the car by a series of hangers and clamps. These fasteners hold the system in place. When hangers come loose or break, hot exhaust components can touch and melt wires, hoses and lines.
Finally, we end at the tailpipe. This is the final outlet for the exhaust. These can be plain-Jane or pretty flashy. Also, the oxygen sensors monitor the oxygen content of the exhaust so the engine control computer can adjust the fuel-to-air mix to keep the car running right.
Exhaust and emissions service covers plain old pipes and high-tech computers. It impacts everything from life and death safety due to exhaust leaks, to fine-tuning the sound of your ride.