Blue Flash
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Blue Flash Tuning

What is EGR and how does it work?

EGR is an abbreviation of Exhaust Gas Recirculation. It is a system that has been fitted to petrol and diesel engines for quite some time now. The purpose of the system is to reduce Nitrogen Oxide (NOx) gases created by the high combustion temperatures. The EGR Valve allows a proportion of the exhaust gases to be re-introduced to the engine which reduces combustion temperatures thus reducing the Nitrogen Oxide (NOx) emissions. This will only take place under certain conditions and is normally controlled by the ECU. The downside of the system is that it does slightly increase fuel consumption and reduce the performance of the vehicle. There are several different types of valve, some operated by a motor or solenoid and some by vacuum acting on a diaphragm.

EGR Faults

Due to the nature of the EGR valve, faults are very common. The carbon and soot from the exhaust mixed with oil mist and vapour from the crankcase breathers and turbochargers can cause the valves to stick and in some cases seize or block completely. If the valve is stuck open the engine will severely lack power and may not even run. If it is sticking intermittently it can cause all sorts of running issues like flat-spots, excessive fuel consumption, poor exhaust emissions and excessive smoke.

What are the options?

At Blue Flash Tuning we have the equipment and expertise to diagnose EGR faults on most vehicles. We will always advise the customer of all of the options available allowing the customer to choose the most cost-effective solution.

In some cases simply removing, cleaning and refitting the valve is the easiest and most cost-effective solution. If access to the EGR valve is difficult, specialist cleaning products can be sprayed into the engine air intake. In some cases these can be successful.

If the valve is unserviceable then replacement is the next option. Some EGR valves are relatively cheap and easy to replace. Others can be expensive; sometimes two valves may be fitted and can be in quite inaccessible areas of the engine bay meaning an expensive, labour-intensive job is required.

Until a recent change in the law, another popular option was to carry out EGR deletion or removal. We DO NOT offer this as an option and urge customers NOT to do it as EGR removal is now an offence under ‘The road vehicles construction and use regulations’.

Please Contact Us with any questions you may have. We are happy to advise and assist where possible.