Monthly Archives: November 2016

Know More About Fuel Injectors And The Periodic Cleaning

Cleaning fuel injectors is a service frequently recommended by dealers and repair shops, but unless there are noticeable signs of clogged injectors (such as a rough idle, stalling, poor acceleration or high emissions levels) it might not be necessary. One tipoff is that fuel injector cleaning is not typically listed on automakers’ routine maintenance schedules.
Many shops promote a quick/easy injector service that runs a cleaning solution through the injectors while they’re still mounted in the engine. A more thorough (and expensive) process for severely clogged injectors requires removing the injectors and cleaning them on a machine designed for that purpose.
Fuel injectors clog when deposits build up over time and thousands of miles; when that happens, they don’t deliver the fine mist of gas that provides maximum performance and efficiency. If that happens, you’ll notice a loss of engine performance or lower fuel economy.
The type of gasoline you use also can be a factor. All gasoline is required to contain detergents that prevent carbon deposits, varnish and other gunk from forming in the fuel system, but not all brands use the same amount. Lower-priced brands often use only the minimum, but the so-called Top Tier brands use more detergents, and some vehicle manufacturers recommend them because of that.
Detergents have been required by the EPA since 1995 because many vehicle owners complained of clogged injectors and fuel-system deposits. Not only has gasoline gotten better since then, but so have the injectors, so problems aren’t as widespread as they used to be.
However, gasoline direct injection, a more sophisticated injection system that operates under higher pressure, is becoming commonplace in engines, and some GDI systems have proved to be more prone to clogging than regular fuel injection.
That’s why some manufacturers, such as Hyundai and Kia, among others, recommend adding a fuel system cleaner to your gas tank periodically if you’re not using Top Tier gas on a regular basis.
Many other gasoline additives that are supposed to clean fuel system parts are also available over the counter, and they may help keep things clean enough so that fuel injector cleaning isn’t necessary. The additional detergents found in Top Tier gas should do the same thing, which might be all your fuel system needs.

Best Time Should Replace the PCV Valve

The positive crankcase ventilation system was one of the earliest emission-control devices. It draws leftover combustion gases from the crankcase (the oil pan and bottom of the engine) and routes them back into the engine, where they’re burned in the combustion chambers instead of escaping into the atmosphere.
The PCV system is seldom listed as a maintenance item, but it can cause performance and emissions problems. A valve that’s supposed to regulate the flow of these gases is the heart of most PCV systems (some newer vehicles don’t have a valve). If the valve doesn’t open and close on schedule, or if any part of the system clogs, the result can be a rough idle, sluggish acceleration or increased oil consumption.
The PCV valve is usually mounted in a grommet on a valve cover, at the end of a hose or tube. One way to check whether a PCV valve is functioning is to remove it and shake it. If you can hear a metallic rattling noise, it’s likely in good working order.
Whether an engine has a PCV valve or not, a hose or tube in the PCV system may become clogged from built-up sludge, or a vacuum hose may leak, so it pays to inspect the entire system, clean it if needed and test the valve for air flow.
A clogged PCV system or inoperative valve can increase oil consumption because pressure builds when the vapors in the crankcase aren’t allowed to flow into the combustion chambers. That additional pressure can force oil past seals and gaskets. If the valve is stuck in the open position, or there’s a leak in the system, that will allow too much air into the engine and throw off the air-fuel mixture, likely triggering the check engine light.
Though it’s not listed in the maintenance schedule in most vehicles, the PCV system should be inspected periodically to make sure it’s still in good condition, especially if engine performance has deteriorated.

Know How Often Should I Replace My Accessory Drive Belt

Most vehicles have a rubber belt on the front of the engine that drives accessories such as the air-conditioning compressor, power steering pump and alternator. If this accessory drive belt (also called a V or serpentine belt) breaks, the battery won’t get charged, the air conditioner won’t blow cold air and the power steering will go out. In addition, if the belt drives the water pump, the engine could overheat.
Most manufacturers call for periodic inspection of the belt as part of scheduled maintenance, but few list a specific replacement interval, and inspection intervals vary widely.
Mercedes-Benz, for example, says to inspect the belt every two years or 20,000 miles, while Volkswagen says to check it every 40,000 miles. On most Ford vehicles, the manufacturer says to start inspecting it after 100,000 miles and then every 10,000 miles. On many GM vehicles, the first recommended inspection is at 150,000 miles or 10 years.
Though these belts often last many years, they can become cracked or frayed and need to be replaced. That’s why they should be inspected at least annually on vehicles that are more than a few years old. In addition, if a belt needs to be replaced, the pulleys and tensioners that guide the belt should be inspected to determine if they caused damage other than normal wear.
A belt that isn’t cracked or frayed may look like it’s in good shape, but grooves on the hidden side may be worn enough that the belt slips on the pulleys that drive the accessories. That will cause problems in systems that rely on the belt to keep things humming. For example, a slipping drive belt may cause the alternator to work intermittently or at reduced power, and the battery won’t get fully recharged as a result, perhaps triggering a warning light.
Another sign of a worn belt is a squealing noise under acceleration. That could indicate that the belt is slipping because of wear, a belt tensioner is loose or a pulley is out of alignment.
Most modern vehicles use belts made from ethylene propylene diene monomer, a synthetic rubber that lasts longer than older types of engine belts. Most belt manufacturers estimate the typical lifespan of an EPDM belt to be 50,000 to 60,000 miles, and some say it’s more than 100,000 miles. However, it can be hard to tell how worn one is with just a visual check because EPDM belts are less likely to crack or lose chunks of rubber than other types. They should be inspected by a professional.