AUTONET TV

Tacky or Techie? The Tachometer.

There's a gauge that many vehicles have that says RPM on it.  And there are a lot of people who either don't pay any attention to it or don't even know what it is. Here's why it's a good gauge to know about.

It's called a tachometer, and that "RPM" label means it is measuring how many revolutions per minute (RPM) the engine is turning.  Automotive experts know that a vehicle's engine can be damaged if it turns too fast (revving too high) or too slowly ("lugging" the engine).

A tachometer (sometimes called a tach) is almost a "must-have" gauge for vehicles with a manual transmission; the driver has to manually change gears; the tach helps the driver know when revolutions are in the optimal range.

Some say you don't need a tachometer if you drive a vehicle with an automatic transmission. It's true that most drivers of automatics don't even look at it.  But there are times when paying attention to the tach can help you prevent an expensive repair.

Here's a good example.  Manufacturers now build many of their automatic transmission vehicles with shift paddles.  They let you shift gears without a clutch. That's manual shifting, and drivers need to know they're not revving the engine too high. That's where the tachometer comes in, since it shows you visually when you are in the red zone (RPM too high).

Here's another way the tach can help you: fuel economy. Generally speaking, the lower the RPM, the better the fuel economy. It's not good to go too low, of course, and the tachometer will help you find that spot of maximum efficiency.

You can also spot problems by paying attention to the tach.  When your vehicle stays in first gear longer than usual (higher reading on the tach), then the RPM dip lower than usual after shifting, it may be that your vehicle's transmission is skipping a gear.  Plus, if your vehicle's RPM go up but your speed doesn't, it could mean your transmission is slipping.  Either situation should be checked by a trained technician.

If your commute takes you down some long grades, you might like to put your vehicle in a lower gear to help slow down the car (and not burn up the brakes). Having a tachometer keeps tabs on when your engine is revving too high.

So, consider the tachometer a "bonus" gauge.  It's one more helpful assistant that can help you spot and prevent problems in your vehicle.

When "Oh, no!" Turns Into, "All right!"

Things we don't expect happen to our vehicles. And let's face, no one really wants to spend money on an unexpected repair. But if you are putting off going to your vehicle repair facility because you're dreading bad news, you might just be putting off some good news.

There was one minivan driver who'd had the same van for years and never had a problem with the power sliding doors.  Then one day, the electrical switches in the door pillars stopped working.  The key fob would still open them, but the door switches wouldn't do a thing.

Of course, the van driver feared the worst: an electrical problem, a major computer failure, mice chewing up the wires.  So, he put off going into the repair facility for a couple of months.  One day, it was time for his regular oil change and the service advisor asked him if there was anything else going on with the van.  The owner mentioned the door problem but said he didn't want to spend a fortune on it.

He waited for his van, and it wasn't long before the service advisor came out with good news. The doors weren't working because a switch on the overhead console had been turned off.  (It was a safety feature to allow parents to disable them.) The owner had accidentally switched it when he was unloading the van.  It was the first thing the technician had checked. Flip the switch back and all was working as usual.

Another example? A mother was driving a minivan with her two kids inside on a hot day when she felt the front end shaking violently as she drove down the road. Fearing something major had broken in the van (and fearing for the safety of her kids), she pulled into a fast-food restaurant parking lot and started to look underneath to see if it was anything obvious she could see.

She couldn't see any broken parts, but she also didn't feel safe getting back in the van with her kids.  So, she called her local service facility and asked if they could send someone to look at it.  When the technician arrived, he took it for a test drive on the same road on which she'd described having the trouble.  Then he put her van up on the lift.  His conclusion?  Nothing was wrong with her van.  It was the street she was driving on.  Crews repairing it had left the surface full of potholes, and that was causing her rough ride.

Ultimately, what these two drivers feared would be an expensive trip to the shop resulted in each driver getting different news than they had expected.  One learned something new about his vehicle.  The other?  Well, the technician saw that her tires were badly worn and convinced her to get them replaced, perhaps preventing an accident and giving peace of mind for a mom with two kids.

For Brakes' Sake (Brake Rotor Service in Millington)

Think of how much abuse your brakes take. Day in and day out, they stop your vehicle when it's going fast and when it's going slow. Maybe your vehicle has been vibrating when you brake, or maybe it seems like your stopping distance is a little bit longer than it used to be.

Then it's time to get your brakes checked out. After all, you have to be able to stop if you want to be safe. Nearly all newer vehicles have disc brakes on the front, and many have that type of brake on all four wheels. That makes it likely you'll be getting disc brakes fixed at some time in your vehicle's lifetime.

Knowing how disc brakes work is as easy as riding a bicycle. If your bike had hand brakes, you'll probably remember a mechanism that squeezed a couple of pads on each side of your bicycle wheel when you applied the brakes. Disc brakes are similar; but instead of the bike wheel, there's a metal disc instead. If that disc is warped or has irregularities in it, it's going to vibrate.

It used to be that rotors were thick, and when they warped, a technician could "turn" them to scrape off a layer of metal so their sides were straight again. The latest vehicles are using thinner, lighter rotors with a slightly different construction. Now, it's likely that rotors that are resurfaced this way will not have enough metal left to work safely. In fact, some manufacturers advise only replacing rotors that are worn out.

Newer designs have reduced rotor prices, and in many cases, the labor cost of turning the rotors is higher than buying new. There are times, though, where your rotors can be resurfaced and still meet manufacturer specifications.

If you have a rotor replaced on one side of your vehicle, it might be a good idea to replace rotors on the other side, too.

Maybe you're looking for the new rotors to last longer than the ones that were on there. New technologies can offer a longer lifespan in a premium rotor. Armed with knowing the type of driving you do, you and your Long Hill Auto Service service advisor can make the best decision on which direction you want to go with your new brakes.

Long Hill Auto Service
1905 Long Hill Rd
Millington, NJ 07946
(908) 647-7984
http://www.longhillautonj.com