![]() low engine speeds with a warmed-up engine) can be caused when the EGR is constantly open and a continuous flow of exhaust gases goes into the intake manifold. Whereas urban driving conditions can allow these deposits to build up.ĮGR valve symptoms can vary, however, the most common symptoms of a faulty EGR valve are explored below: Your engine has a rough idleĪ rough idle when starting your vehicle or during brief stops (i.e. Motorway driving conditions are the most favourable to your EGR valve as longer, faster journeys allow the engine to get hot enough to get rid of carbon deposits. It can also cause vehicle emissions to increase.ĮGR valves can become stuck ‘open’ or ‘closed’ due to a build-up of soot particles, carbon deposits and dirt from fuel. What are the symptoms of a failing EGR valve?Ī faulty EGR valve can cause problems with the flow and operation of the EGR system leading to performance issues including a reduction in power, reduced acceleration and decreased fuel efficiency. The ECM receives inputs from various sensors throughout the vehicle to determine the prime position of the EGR valve throughout your journey. Most modern cars utilise an electronically controlled EGR which is controlled by the vehicle’s engine control module (ECM). The vacuum is often regulated by a computer-controlled solenoid. It is a straightforward system that utilises a vacuum to switching the EGR valve from closed to open. A vacuum-operated EGR valve is usually only found in older vehicles. There are two types of EGR valves a vacuum-operated and an electronically controlled EGR valve. This helps to ensure the car maintains fuel efficiency and emits fewer emissions. This happens continually throughout your journey to ensure recirculation only occurs when the car is at a working temperature. As you speed up and the engine reaches its operating temperature the valve gradually opens, however, should you slow down or stop the valve will gradually close. Operationally this means that when the engine is first started the valve stays in a closed position. I’d like to know how many people have had this issue and what you did to get rid of that tapping noise or at least make it quieter.The EGR valve is fairly simple when it is open exhaust gases are allowed through the EGR system to help control vehicle emissions, whereas when the valve is closed exhaust gases can’t pass through the EGR system. Right now I’m running Castro Synthetic Oil. He said his Tundra runs quieter on Valvoline synthetic oil. I talked to a customer service guy for Toyota about it and said using different oil might help too. Someone also said I could run Miracle Oil in the oil and engine and that it would help remove the varnish. I did add Lucas Oil for synthetic oil and it was noticeably quieter. ![]() I’m wondering if there are ways to reduce the noise. He said these engines tend to get a varnish build up on the fuel injection and valves but it nothing to be too concerned about. A Toyota Dealer mechanic told me that it’s fairly common for these engines with 30k+ miles. The one I’ve had the most concern about is a light tapping/ticking noise coming from the engine. But there are new sounds that I’m not accustomed too. So I replace her with a 2016 4Runner TRD Pro. But my last faithful steed has gone to pasture. I owned a nothing but Isuzu Troopers the last 25 years. ![]()
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