AUTONET TV

Talk to KPS Princeton Garage About New Shoes for Your Vehicle

Custom wheels are one way that Princeton folks express themselves and personalize their vehicle. But they aren't as cheap and easy as sticking decals on your back window. There are several factors that need to be considered, including cost, the fit of the wheel, modifications that will have to be made to the vehicle, how the new wheels and tires will affect the operation of the vehicle, your driving habits and, of course, the style of the wheels. Most Princeton drivers start with the last factor: the style of the wheels. But that should be the last thing we choose.

When considering custom wheels, you should first carefully consider your budget. Some wheels may require adjustments to your vehicle suspension system, brakes, or traction systems. You need to know what you can afford before you start shopping or get your heart set on a particular type of wheel.

There are three basic ways you can change your wheels. First, you choose a wheel that is already the same size as the ones on your vehicle. Second, you can choose larger wheels and third, you can choose smaller wheels. Mounting wheels that are the same size as the ones already on your car sounds easy enough. But even though the wheel may be the same diameter as your current wheels, that doesn't mean it will fit your vehicle. Besides diameter, wheels also have an offset. This is the measurement from the inside edge of the wheel to the point at which it bolts on. If your new wheel does not have the same offset as your current wheels, your vehicle tires can rub on the inside or outside of the wheel well. This can lead to blowouts, uneven tread wear and other mechanical problems.

The tire and wheel professionals in Princeton at KPS Princeton Garage on 3860 NJ-27 can help you select a wheel that has both the correct diameter and offset for your vehicle. Or, if you really want a specific wheel in spite of the offset difference, your technician may be able to install adapters that will make the wheels fit.

Mounting larger wheels is a more involved process. There are several ways of doing this. You can mount larger wheels but keep the overall tire diameter the same. Or you can “supersize” your tire/wheel combo. Mounting larger wheels while maintaining the same overall tire diameter is the easiest way to increase wheel size. You still need to adjust for offset. Generally, this alteration means that your new tires will be wider than the originals, so you will have to install adapters to keep them from rubbing on the wheel wells. Consult your service advisor at KPS Princeton Garage by calling 732-297-9515.

If you want to install larger wheels and increase the overall tire diameter, it is important that the package fits in the wheel well; you may have to do some minor modifications to your suspension. More importantly, you will have to reprogram your vehicle engine's computer to calibrate for the larger tire size. The computer calculates your speed based on the rotation of your tires, so increasing the size of the tires will render it inaccurate. Inaccurate speed calculations can mess up your anti-lock brakes and your stability control systems, as well as your speedometer and odometer.

As you can see, the more modifications you make, the more it becomes important to have your friendly and knowledgeable KPS Princeton Garage tire and wheel professional help you with your car care.

If you really want those “super-sized” tires, great: just factor in the issues listed above, plus you may have to have modifications done to your suspension system.

The larger wheels and tires will add weight to your vehicle. This weight is not held up by the suspension system, so is referred to as “unsprung” weight. Adding unsprung weight affects your car differently than just adding loads inside of your car. Unsprung weight can affect acceleration and braking. Putting large wheels on your vehicle may require an upgraded brake system.

Also, you may not get the performance from your vehicle that you've been used to. It may be sluggish when accelerating or harder to handle when turning. You may also find that the ride is bumpier than it was before. Of course, done right at KPS Princeton Garage, a good wheel job can sometimes improve a vehicle's ride or performance. It just depends on your vehicle, the type of wheels you choose and what you are hoping to accomplish.

Now let's suppose you want smaller wheels on your vehicle. That should be easier, right? Not really. You still have to worry about offset, and it is important that your computer be reprogrammed to account for calibration issues. And you may need adjustments to your suspension system.

Remember your budget? All of these scenarios require that you shell out some money. Perhaps now you can see why it is good auto advice for Princeton drivers to make that consideration first, before setting their heart on a specific type of wheel.

Another consideration should always be your driving habits. Do you do a lot of off-roading on the outskirts of Princeton? Do you carry heavy loads? Do you tow a trailer on NJ roads? All of these factors must be considered when replacing your tires and wheels. Some wheels just may not be up to the work you need them to do.

For example, if you mount large rims on your vehicle, then add low-profile tires to avoid major adjustments to other systems, they won't be able to handle off-roading as well as larger tires. There won't be enough sidewall on the tires to absorb the impact from off-roading. You could end up with dented or broken rims.

At the end of the day, Princeton drivers should always put safety ahead of appearance. That's why you shouldn't add custom wheels to your vehicle without consulting with your KPS Princeton Garage tire and wheel professional. Cutting corners when installing custom wheels by not making necessary adjustments to all of the systems impacted by the change can result in dangerous operating conditions as well as repairs down the road.

The friendly and knowledgeable auto professionals at KPS Princeton Garage want to remind Princeton drivers of the basics of vehicle safety: preventive maintenance, emergency preparedness and professional repairs. Stay safe, and stay on the road.

KPS Princeton Garage
3860 NJ-27
Princeton, NJ 08540
732-297-9515

Why Is My Check Engine Light On?

The Check Engine Light strikes fear into the hearts of some Princeton drivers, and is totally ignored by just as many. Just what it means is a mystery to most people.

Let's get the urgency issues out of the way first. If your Check Engine light is flashing, that means that something is wrong that could cause engine damage. Naturally, you need to get that taken care of right away. If your check engine light is flashing, you shouldn't drive at high speeds, tow or haul heavy loads. Take it easy all the way to your Princeton service center.

If the light is glowing steadily, you should keep an eye on it for a day or two. If the light doesn't go off, schedule an appointment with your friendly and knowledgeable pros at KPS Princeton Garage to get it checked out.

Some more information on how the Check Engine light works may be helpful for Princeton drivers. Most of your engine functions are controlled by a computer, not surprisingly, called an engine control computer. The computer is able to adjust many engine parameters for environmental conditions, engine condition and even the way you drive.

In order to make these adjustments, the computer relies on a network of sensors to provide data. The computer knows the proper operating range for each sensor. When a sensor reading is out of range, the computer runs some tests and may turn on the vehicle's Check Engine light.

A simple example is a loose or missing gas cap. This may cause one of the sensors to read out of range. The computer doesn't know if it's a serious condition that caused the reading or just a loose gas cap, so it stores a trouble code and turns on the Check Engine light.

Now when you tighten up the gas cap, the sensor readings will be in the correct range. The computer will keep checking on the report for a day or two. Since a bad reading didn't come up again, it turns off the Check Engine light. The computer will also try to make adjustments to compensate for some readings. If it can do so, it'll then turn off the Check Engine light.

If the problem can't be resolved then the light will remain on, and you should get your vehicle looked at. Your friendly and knowledgeable pros at KPS Princeton Garage will plug a scanner into the on-board diagnostic port and read the trouble code stored in the computer. The trouble code will give the technician a starting place as he diagnoses the cause of the problem.

KPS Princeton Garage
3860 NJ-27
Princeton, NJ 08540
732-297-9515

Don't be Fuelish (Signs Fuel Pump is Failing)

A driver of a large SUV loaded with equipment was heading on a 7-hour work trip when he stopped at a gas station to refuel.  When he went to restart his SUV, it turned over but wouldn't catch.  Try as he might, he was never able to get it started again. 

Of course there are many things that can cause those symptoms, but the next day he had his SUV towed to a service repair facility.  Using their test equipment, they were able to pinpoint the problem.  His fuel pump had failed.  The pump, which was located in the fuel tank, had to be replaced, and after awhile he was back on the road, delayed, but happy to be up and running again. 

What had happened is that the pump was not strong enough to deliver adequate  fuel to his engine, vital to being able to start it.  It had delivered just enough pressure in the morning to get it started the first time, but it was on its last legs.  He had been having trouble starting his SUV in the days leading up to this trip, a clue that something was wrong. 

The engine relies on a certain pressure of fuel from the pump to run properly, and there are some other signs to be aware of that your fuel pump may need to be replaced.  If you are putting strain on your engine, such as going uphill or hauling a big load, and the engine sputters, it may be a sign that the pump isn't delivering that consistent pressure.  Another warning sign is if your engine is running hot and then stalls.  That could mean your fuel pump is getting weak.

Sometimes you might notice your vehicle suddenly speeds up on its own or your fuel economy goes from good to poor in a short time.  If your fuel gauge shows you have plenty of fuel in the tank and your engine stalls, that's another possible sign of a failing fuel pump. 

Technicians have special equipment to see where the fuel problems are, and there are many possibilities.  Have your vehicle checked before you're left stranded.  Oh, and one more tip to prolong the life of your fuel pump.  Since it is cooled and lubricated by the fuel in your tank, make sure you keep at least a quarter of a tank of fuel at all times.  Avoid your "low fuel" light going on and you may be helping yourself avoid having to replace your fuel pump. 

KPS Princeton Garage
3860 NJ-27
Princeton, NJ 08540
732-297-9515

Regular Schedule or Severe Service Schedule at KPS Princeton Garage?

Today's KPS Princeton Garage article focuses on severe service maintenance. Many Princeton drivers are not aware of them and yet there are also very vocal advocates in NJ who think that severe service schedules apply to everyone. Somewhere between a complete lack of awareness and the dire blanket statements lies a reasonable approach to severe service maintenance at KPS Princeton Garage.

To back up a little, vehicle owner's manuals have schedules for preventive maintenance: things like oil changes, transmission service and so on. They say you should change your oil after a certain distanced traveled or after so many months. Princeton drivers understand this very well. What they may not know is that there are actually two service schedules: the regular schedule and the severe service schedule. The mileage and time intervals are lower on the severe service schedule.

Now when you hear 'severe service,' you may think it doesn't apply to you because you don't feel your driving conditions are severe or extreme – it's just normal everyday driving in the Princeton area. So let's list some of the conditions that classify as severe so that you can make the judgment on your own driving.

Before we start the list, here's a point of contrast that definitely is not severe driving. Driving down your nearest NJ interstate at the highway speed limit on a 75 degree F/24 degree C day loaded only with your passengers. This is an easy trip for your vehicle: your engine is loafing along at low RPMs, no heavy loads to pull and moderate Princeton temperatures. Now let's look at some severe service driving conditions.

Most trips around Princeton are less than four miles/six and a half kilometers. When your vehicle engine cools down, moisture condenses in the engine. This water in the oil doesn't get a chance to evaporate on short trips because the oil doesn't get hot enough. A lot of short trips in your vehicle means a lot of water build up. And water in the oil leads to the creation of sludge which can damage the engine. Changing the oil more frequently keeps sludge from building up. By contrast, highway driving warms the engine up and gets the water burned off.

Here's another example. Most trips around Princeton are less than 10 miles/16 km and outside temperatures are below freezing. This is the same reasoning, but in very cold NJ weather it takes even longer for the oil to get hot enough to evaporate the water, hence 10  miles/16 km as opposed to 4 miles/6.4 km.

Next, you drive in very hot NJ weather. The hotter it is outside, the more cooling the engine, transmission, brake fluid and so on becomes. The environment in which the fluids reside is more hostile, and the fluids simply break down faster. Therefore, the lower change interval.

Another: driving at low speed most of the time. Every vehicle engine has what's called its power band. This is a range of RPMs in which it's most efficient. Low speed driving doesn't keep the engine in its power band so it's working harder. This is one of the reasons that ratings are worse in downtown than on the highway.

Stop and go driving in Princeton is another severe service condition. You're always accelerating, which works the vehicle engine and transmission harder. Then you're stopping, which works the brake fluid harder, causing it to get very hot. Highway driving, on the other hand, requires far less horsepower to maintain its speed than getting a stationary vehicle from a stop light up to 25 mph/40 kph. A lot of this and you'll need to follow the severe service schedule.

Also on the list is operating your vehicle in dusty, polluted or muddy conditions. Obviously, your engine air filter and cabin air will get dirty faster and need to be changed more frequently as will your breather element. Some of this dust and dirt will make its way into your fluids. They will simple get dirty faster and won't protect the components as well as fresh fluids.

Finally, you're driving under severe conditions in Princeton when you tow a trailer, regularly carry heavy loads or carry a car-top carrier. This is pretty obvious. You'll spend more time in lower gears so the engine and transmission work much harder and create more heat. Brakes will be more stressed stopping the heavier loads.

Sounds like most of us in Princeton operate under severe driving conditions at least some of the time. How can Princeton drivers know which schedule to follow?

Think of it as a spectrum with "always driving under severe conditions" on one end and "never driving under severe conditions" on the other end. Some will be at one extreme or the other, but most of us will fall somewhere in between.

Carefully think about your driving conditions and decide if you should do your preventive maintenance closer to the severe service recommendation or the regular recommendation. Of course, your KPS Princeton Garage service advisor can help you with your decision.

KPS Princeton Garage
3860 NJ-27
Princeton, NJ 08540
732-297-9515

KPS Princeton Garage Advice on What to Pour into Your Vehicle

Changes in vehicle design and manufacture have resulted in changed fluid requirements for our vehicles. With the sophistication of engines, transmissions, differentials, etc., it's best for Princeton residents to always use the proper type of fluid for their vehicle. Using incorrect fluids can actually damage your engine.

As engines have become more sophisticated, new weights (or grades) of engine oil have been introduced. Today, there is a much wider range of weights for engine oil as well as a variety of formulations for different types of engines.

Transmission fluid, brake fluid and coolant/anti-freeze have changed because the materials that go into making the systems they protect have changed. The fluids in our vehicles generally have two jobs: to lubricate and to prevent corrosion. The fluids formulated for your vehicle are specifically designed to protect the materials that make up its engine parts. Using the wrong fluid may leave some parts vulnerable to corrosion. Further, using the wrong fluids can also void your vehicle's warranty. So KPS Princeton Garage recommends Princeton drivers follow the fluid recommendations in their owner's manuals.

Vehicle fluids, including engine oil, are also designed in special formulas for higher mileage vehicles. These formulas contain additives that help clean older engines and transmissions as well as recondition older seals and gaskets. These fluids are perfectly okay for your vehicle as long as you match the original fluid recommendations in your owner's manual. In other words, a high-mileage oil is fine as long as it is the same weight as the oil recommended by your vehicle's manufacturer.

Good vehicle care always includes proper attention to your vehicle's fluids. Understanding and using correct fluids will keep your vehicle running well and will help prevent early corrosion and wear of vital engine parts.

Talk to your KPS Princeton Garage service advisor for more information.

KPS Princeton Garage
3860 NJ-27
Princeton, NJ 08540
732-297-9515