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Tag Archives: engine running rough

Check Engine Light

Check Engine Light

  A "check engine" or "service engine soon" light can mean many various things, from a misfiring engine to a loose gas cap. Below are the five most common reasons a check engine light will be displayed: 1. Replace the Oxygen Sensor An oxygen sensor monitors the unburned oxygen from the exhaust. The oxygen sensor monitors combusted fuel. A faulty sensor means it is not providing the right data to your car's computer and causes a decrease in gas mileage. What causes a faulty sensor?  The sensor gets covered in oil ash over time and reduces the sensors ability to alter the oxygen and fuel mixture. A faulty sensor not only reduces gas mileage, but it also increases emissions. What you should do Not replacing a broken oxygen sensor can eventually lead to a broken catalytic converter. 2. Loose or Faulty Gas Cap A cracked or loose gas cap will cause the fuel vapors leak out, and can throw the entire fuel system off.  A loose gas cap causes a reduc ... read more

Winter Car Starting

Winter Car Starting

Winter car starting can be challenging on cold winter mornings. There are four reasons we believe why the cold weather makes it harder to start cars: 1. Batteries hate the cold Cold weather and car batteries do not mix, making winter car starting more difficult. Chemical batteries produce less current when it is cold — sometimes a lot less. At DJ Foreign Auto Care, we recommend changing it every three years, though you could get away with five years, depending on how much you drive and how you drive. Make sure the battery cables aren't disconnected. With your engine off, check if the cables can slip free from the nodes.  Tightening the nut is an easy job and can save you from a mid-drive battery loss that would require you to get out of your car and take off your gloves. Check for corrosion. If there is a white powder around the nodes and/or clamps, it could be a sign of corrosion. If you can't get a new battery, we recommend cleaning the nodes and clamps with baki ... read more

Categories:

car care

Failing EGR Valve

Failing EGR Valve

What is an EGR valve? The EGR valve is a small component, invented to allow the flow of exhaust gases into the intake manifold in controlled amounts. It is a simple valve that closes and opens as needed. The EGR valve has one job to do. Its role is to either open and direct exhaust gases into the combustion chamber or to close and keep the gases from entering. When your car engine starts, the valve becomes active and remains in a closed position, barring the flow of exhaust gases. Once the engine reaches working temperature and speed is increased, the valve — either through a vacuum or electronic control — increasingly opens, allowing burned exhaust gases to enter and combine with the air-fuel mixture inside the combustion chamber. If you slow down or come to a stop, the valve progressively closes and blocks the flow of exhaust gas. The process continues for as long as the engine is running. When the engine is off, the EGR valve closes and remains so. The EGR valve has ... read more

Categories:

Mercedes-Benz

Fuel Pump Replacement

Fuel Pump Replacement

  Fuel pump replacement is a necessary part of your car's maintenance.  A fuel pump transfers fuel from your tank to your engine. It supplies the fuel at a constant pressure to ensure that the engine is running smoothly. Mechanical or electronic fuel pumps are standard in your vehicle.   A mechanical pump has a diaphragm mounted on the outside of the fuel tank that expands and contracts, creating a vacuum system that expels fuel out of the gas tank and into the engine. Electronic pumps use an electromagnetic motor inside the fuel tank that forces fuel into the engine at a high pressure. Cars with carburetors contain mechanical pumps while vehicles with fuel injection systems have electric pumps.   The motion of the engine directly drives a mechanical pump. Since mechanical pumps contain few moving parts, they tend to be reliable and easy to diagnose and fix. The most common problems with mechanical pumps occur when the diaphragm is damaged in some way, whic ... read more

Categories:

car maintenance

Walnut Blasting

Walnut Blasting

                                    Walnut blasting is now being offered at DJ Foreign Auto Care! What is walnut blasting you may ask? Walnut blasting is a process that is used to treat heavy carbon build-up. Cars require oxygen to run. With modern direct injection engines, when your foot is placed on the accelerator, the car releases gasoline into the combustion chamber of the vehicle. The spark plugs then ignite the gasoline in the combustion chamber, causing the car to run. Carbon is released into the engine as a byproduct of this process.  The carbon interferes with the vehicle’s normal combustion, which in turn alters the compression ratio, operating temperature, and sensor readings.  The carbon builds up and coats the inside of your engine including the air intake valves, combustion chamber, and exhaust, restricting your car’s ability to breathe and al ... read more

Categories:

car maintenance

BMW Crankcase Vent Valve Season

BMW Crankcase Vent Valve Season

  BMW crankcase vent valves fail more often this time of year and we see more of these types of problems as the weather gets colder. The BMW crankcase ventilation valve is also known as the oil separator, CCV, or PCV valve.  According to Wikipedia, "A crankcase ventilation system is a one way passage for gases to escape in a controlled manner from the crankcase of an internal combustion engine.  This is necessary because internal combustion inevitably involves a small but continual amount of blow-by, which occurs when some of the gases from the combustion leak past the piston rings (that is, blow by them) to end up inside the crankcase, causin ... read more