EGR

Exhaust Gas Recirculation is a system designed primarily to reduce nitrogen oxide emissions from internal combustion engines, but a quality EGR system properly fitted can also increase engine efficiency. EGR is a required feature on most modern internal combustion engines. EGR works by recirculating a portion of an engine’s exhaust stream back in to the engine, optimising the incoming flow of oxygen and providing inert gasses that absorb some of the heat generated by the combustion process. Because EGR is now a legal requirement, faulty EGR systems will need to be replaced as soon as possible. In most modern vehicles, a damaged EGR will trigger a warning light on the dashboard and can cause the vehicle to fail an emissions test if checked.

This clogged EGR valve causes the engine to run badly due to an imbalance in the fuel/air mixture. If the jammed EGR valve is not repaired or replaced quickly, all sorts of problems may occur. Four of the most common are rough running, high fuel consumption, turbocharger failure and, sometimes, total engine failure.

When the EGR valve is clogged or dirty, as they are prone to, it may not function properly causing the engine idle rough, stall at idle speeds, cause the car to get poor fuel mileage, or emit a strong smell of fuel due to excess hydrocarbons which also results in failing emissions tests.

The EGR valve is an important component in the exhaust gas recirculation process as it helps to prevent exhaust valves from overheating, which can accelerate their wear and tear. The EGR valve therefore helps maintain the exhaust system at full capacity and increases the longevity of the internal combustion process.

One of the first symptoms of a problem with the EGR valve is engine performance issues. A clogged or malfunctioning EGR valve can disrupt the vehicle's air-fuel ratio, which can cause engine performance issues such as a reduction in power, acceleration, and even fuel efficiency.

  • What are the symptoms of a faulty EGR valve on a diesel?
  • Your engine has a rough idle.
  • Your car has poor performance.
  • You have increased fuel consumption.
  • Your car frequently stalls when idling.
  • You can smell fuel.
  • Your engine management light stays on.
  • Reduced Horsepower.
  • Black Smoke or Flames Exiting the Exhaust.
  • Service Engine Light.

ERG stands for Exhaust Gas Recirculation and it is a function performed within the combustion engine of a car. The measure is sophisticated in the way it is carried out as exhaust gasses are recirculated back into the inlet manifold to be used for combustion again. The reason that ERG takes place is to reduce the production of oxides of nitrogen which is harmful to breathe in and is damaging to the environment. The impact of exhaust gas being recirculated is a drop-in engine performance and fuel economy. Diesel cars are also subject to an increase in the production of soot and harmful particulates. However, new engines are able to utilise a variety of clever electronic control strategies to reduce the impact of using an EGR system. At the heart of the ERG system is the ERG valve, a part which has evolved over time to be more efficient and effective. For example, the part used to be pneumatically operated which limited it to only an 'open' or 'close' setting, however, the ECU is used to allow continuous levels of adjustability in new models. An ERG valve has to be highly robust as exhaust fumes travel through at extremely high temperatures and velocity. There is also a high volume of soot and particulate matter carried by the fumes and as it has not passed through the DPF, it can build-up in the ERG system, causing problems.

When there is a build-up of soot and particulate matter, the EGR valve can become stuck open or closed as the substance can become tar like. A blocked EGR valve could be the cause of the engine light in your car switching on as the engine emissions system will not be performing properly. Wiring and pneumatics could be the root cause of ERG problems as the communication between the ERG valve and ECU may be compromised. This can be a difficult problem to diagnose as the ERG valve is not the most common cause of the engine warning light coming on and mechanics may not decide to look at the part until after checking more obvious potential causes. However, using an intelligent diagnostic tool which connects directly to the ECU in your car, a mechanic may be able to see the problem immediately. However, the ECU will only be able to tell if there is an ERG problem if there is a total failure. It will not be able to detect degradation. If the ERG valve is stuck open, your car will suffer from a rough idle and a drop-in engine performance as well as a decrease in fuel economy. If the ERG valve is jammed shut, there may be an increase in the temperature within the cylinder which may lead to engine knocking. Fortunately, modern cars are fitted with knock sensors which will enable the car to adapt accordingly.

The EGR valve works by recirculating a measured amount of the exhaust gases back into the engine through the air intake system, reducing the amount of emissions the engine produces.

The fuel air mixture can also spontaneously combust, causing valve clatter and damaging the engine. Allowing a small amount of exhaust gas back into the intake reduces combustion chamber temperature. Regulating the flow of exhaust gas is the job of the EGR system. What will a stuck EGR valve do? An EGR valve that is stuck open: if your truck has a mechanical EGR valve and it happens to be stuck open, it will act as a conduit which causes a vacuum leak in the engine. Some of the manifestations of this include rough idling and even a feeling of hesitation when you try to accelerate Why does an EGR valve fail? This is when the EGR valve mechanism remains shut when the engine is at a high RPM. This causes a high temperature in the combustion chamber due to the absent exhaust gas cooling effects, the production of the nitrogen compounds will further lead into more detonation which is burning the fuel without any ignition. Can a faulty EGR valve cause bad starting? An increase in hydrocarbon emissions isn't necessarily caused by a stuck-open EGR valve. Problems in other systems may cause this same symptom as well: a leaking fuel injector, bad ignition timing, bad cylinder compression, bad oxygen sensor, or other problems

But the cause might be anything from a hard-to-find vacuum leak to dirty fuel injectors, low fuel pressure, a weak ignition coil, bad plug wires, or compression problems. An EGR valve that is leaking can also act like a vacuum leak and cause a random misfire Replacing an EGR Valve If your car needs to have its EGR valve removed, you will have to pay for a new part and the labour time of the mechanic. Fortunately, this is not the most complex of repairs as the part is not usually buried too deeply within a car engine. However, the only way to know how much an ERG valve replacement will cost on your specific car is by getting a range of quotes from the Many Autos. Finding a mechanic, you can trust to do a good job and charge a fair price for EGR Valve, is not always easy which is why we have simplified the process off Many Autos car repair Service.

Sometimes, the worst part of getting your car fixed is having to bring it to the garage. We are therefore happy to offer our customers a free collection and delivery service If you prearrange a collection, we will pick your car up from your home or place of work and drive it to our premises, carry out all the necessary work (having consulted you) and deliver it back to you at the end of the day.

We are able to tow, jump start or repair your vehicle if you are experiencing problems or broken down for a small fee. If we can't sadly start your vehicle, we can contact a local recovery firm to collect your vehicle for a very competitive price.

  • Don't want to waste your day off?
  • You don't have the time to take your car in for a service or repairs?
  • Have you got problems with getting to and from the garage?

Here at Many Autos, we believe that we offer a valuable product with our Free Collection and Delivery Service, we can collect either from your place of work or from your home address. If you are unsure about whether the address you are considering having your vehicle collected from is not within our range, then please do contact us.

Many Autos operate a fleet of pool cars with a dedicated driver, so wherever we are collecting from, we need to be able to leave one of our pool vehicles either in your work car park / parking space, or if in a residential area, we would need to be able to leave our car either at your house or on the road with a permit if required. We would be grateful if you could bear this in mind when booking to use our free Collection and delivery service