AUTONET TV

Idle Talk about Engines (Causes of Rough Engine Idling)

When you slow down at stoplight, your vehicle's idle should be smooth as silk.  But what happens when the engine is missing or idling roughly? That's your engine's way of telling you, "Hey, I've got something wrong with me and if you don't get someone to find out what it is, I may not start the next time you turn the key."

You can help your service facility if you can describe the problem in detail.  Here's a list of things to make a note of:

• When is the problem happening, when the engine is cold or when it's been running for a while?
• Does the rough idling occur when I'm accelerating or when I'm going at a steady speed?
• Does it happen at high speeds?  Does it happen low speeds? Does it happen at both?

Make sure you describe the problem in as much detail because it will help a technician diagnose the problem.

One of the first things they'll check is how the spark plugs are firing.  Modern iridium plugs are supposed to last a long, long time.  But they CAN eventually wear out.  Inspecting the firing end can help the technician figure out the root of the problem.  Corroded or worn out spark plug wires, too, can contribute to an idling irregularity. 

There are other potential problem spots, too.  The technician may check the ignition coil, timing piston rings, valves and cylinder walls. 

If the mixture of air and fuel isn't correct, that may affect how smooth your vehicle is running.  Your service facility is equipped with diagnostic equipment that helps them pinpoint the problem.  Once that idle is smoothed out to the way it used to be, you'll be the smoothest operator on the road.

McLearen Shell
3043 Centreville Road
Herndon, VA 20171
(703) 318-7744
http://www.mclearenshell.com

Rear Window?Not the Movie! (Why Some Rear Windows Don't Go All the Way Down)

Alfred Hitchcock once made a mystery thriller film called "Rear Window." It had nothing to do with the rear window of today's cars, SUVs, CUVs and light trucks.  But there is one thing that some drivers DO find mysterious.  Why don't the rear windows in the second row of many of these vehicles go down all the way?

You've probably seen or owned one or two. That rear side window only goes down about a third, a half or three-quarters of the way. Yet there are some similar vehicles where the window goes down all the way.  What gives?

There was the rumor going around that the restriction on how far those windows could go down was a child safety feature.  The thought was that if those windows couldn't open up fully, a child (or pet) would be less likely to fall out.  But it turns out the real reason is that the way the rear doors were designed, there was just no room for the window to go down all the way into.

Many vehicles are configured so that the rear wheel arch continues into the rear door.  That arch restricts the space that would accommodate the window, so they had to stop the window somewhere higher than bottom of the door.

Seems buyers would prefer those back windows to go all the way down, so many manufacturers are changing designs to make that happen.  Longer vehicles can have their wheels pushed further back so the wheel arch isn't an issue.  Some have altered the position of the rear window track. 

If you have any questions about your rear side windows, you may want to consult your service advisor to check yours.  If they ARE supposed to go all the way down and they're not, it could be due to a few problems: corrosion, broken or bent window regulator components, electrical issues, etc. But if they're not supposed to go down all the way?  At least now you know for sure.

McLearen Shell
3043 Centreville Road
Herndon, VA 20171
(703) 318-7744
http://www.mclearenshell.com

The Right Fluids for Your Vehicle

The current vehicles in the market have over a century of engineering behind them. They have evolved into complex and powerful machines. Developments in their engines, however, have coincided with advances in many other vehicle components, including the fluids.

It's up to people in Herndon to always use the right type of fluid for their vehicle. Your service advisor and your owner's manual are resources for auto advice on exactly what types of fluid your vehicle needs. Improper fluids can damage your vehicle and void your warranty.

Some of the fluids that have changed significantly in recent years are cooling system fluid, brake fluid, transmission fluid and motor oil. Each of these comes in many varieties now, and it's hard to know exactly which one your vehicle needs.

Cooling systems were once made of iron, steel and rubber. One coolant could be used to protect all of these materials. But new cooling systems have components made from a variety of metal alloys and several kinds of plastic, and coolants now contain additives that protect these various materials from corrosion. Since the materials vary among manufacturers, they require different additives, which means there are now several coolants on the market. The type of coolant your vehicle needs depends on the materials used in its cooling system.

Most vehicles used to require DOT 3 brake fluid. But now many vehicles need DOT 4 or DOT 5. Some Herndon drivers mistakenly think the higher numbers reflect an increase in grade—that DOT 4 is somehow better than DOT 3. But the truth is, the numbers represent variations in formulation. The different formulas have evolved to meet the demands of newer and better brake systems. For a long time, transmission fluid came in two varieties: regular and friction-modified. But transmissions have come a long way recently and so have the fluids that protect and lubricate them. There are several new types of fluid on the market, but your vehicle is designed for just one of them.

Of all the automotive fluids, motor oils have experienced perhaps the greatest advances in engineering and technology. A number of new weights and formulations have recently been developed to meet the needs of modern engines, which have more parts and tighter tolerances than ever before. Engines have become more sophisticated and complicated, but they have also increased in power and fuel efficiency. Despite these changes, Herndon vehicles still need them to be highly durable.

That's the job of motor oil. Motor oil still has to perform its original function—lubricating and protecting the engine. It is formulated to help clean the engine as well. Modern motor oil also has to be thin enough to penetrate small engine passages yet still be resistant to vaporization.

Specialized motor oils have also been developed for high-mileage vehicles. If your vehicle has 75,000 miles/120,000 km or more on it, you might consider switching to one of these motor oils. They contain extra detergents that help clean older engines, additives that condition seals and gaskets that can become brittle with age. High-mileage motor oils come in weights and types just like regular motor oils, and Herndon drivers should match the proper weight and type of high-mileage oil to their vehicle in the same way you would regular motor oil.

Over time, vehicles have developed in complexity and variety, and their fluids have developed as well. Each vehicle is matched to a set of fluids that meet its specific requirements. VA vehicle owners should take care to learn their vehicle's fluid requirements before topping off at home. A large part of preventive maintenance for Herndon drivers is making sure your vehicle's fluids are clean and adequate, but they must be the proper type as well. As our vehicles become more sophisticated, car care becomes more sophisticated as well.

Learning about proper fluids for your vehicle will help you maintain its performance and prolong its life. Talk to us at McLearen Shell in Herndon.

 McLearen Shell
3043 Centreville Road
Herndon, VA 20171
(703) 318-7744
http://www.mclearenshell.com

The Importance of Herndon Drivers Following Service Intervals

Today in our McLearen Shell blog, we're going to talk about following recommended service intervals. Your vehicle isn't the only aspect of your life in Herndon with recommended intervals: Let's start with twice yearly dental check-ups and regular physical exams. How about laundry, watering the lawn and paying the bills?

Now, what would happen if you didn't follow these intervals? Well, you'd get more cavities. You may not discover health conditions that could be more effectively treated with early detection. And you'd have to wear dirty clothes, be embarrassed by your brown lawn and have your utilities shut off.

Clearly, there are some things in life that we have to take care of regularly. If we don't, there are negative consequences. Our quality of life in Herndon takes a hit and it inevitably costs more money.

So why is it so hard to remember to follow regular preventive maintenance on our vehicles? Probably a couple of reasons. One is that automotive maintenance items just don't seem that urgent. All our Herndon neighbors can see our dead lawn, but no one knows how dirty our transmission fluid is. It's easy to put off. The other reason is that we're just not as familiar with automotive maintenance, so it's a bit intimidating.

From a practical standpoint, people in Herndon don't need to memorize their vehicle owner's manuals. You can let your McLearen Shell advisor remind you of the guidelines established by the vehicle manufacturer; he has checklists of what the manufacturer recommends and can find potential problems when he inspects your vehicle. You really can rely on McLearen Shell professionals to help you make good automotive decisions.

For Herndon drivers who want to be more proactive with their vehicle care, here are some simple ways for you to remember what has a maintenance interval.

First: Fluids. If it's liquid, it's got a replacement schedule. Oil, transmission fluid, coolant, power steering fluid, brake fluid, differential fluid, etc.

Then think tires. They need air, rotation, balancing and alignment. And while you're thinking tires, don't forget brakes and shock absorbers.

And what makes your vehicle go? Air and fuel. Air filter replacement, fuel filters and fuel system cleaning. Of course there are more items, but if Herndon car owners remember to take their vehicle in to McLearen Shell for these things, their service advisor will help them with the rest.

And if you don't follow recommended service intervals? You get lousy fuel economy, your vehicle doesn't run as well, your safety is compromised and you'll spend more money in the long run. So it's the same as everything else: The quality of your motoring life takes a hit and it ends up costing you more.

Reason enough for me to follow recommended service intervals.

McLearen Shell
3043 Centreville Road
Herndon, VA 20171
(703) 318-7744
http://www.mclearenshell.com