Toyota EGR (Exhaust Gas Recirculation)
The EGR system is an emission control subsystem. It reintroduces a small amount of the exhaust gasses back into the intake manifold under certain circumstances in order to reduce the intensity of the combustion and lower peak combustion temperatures. This serves a couple of purposes: It decreases the creation of nitrogen oxides, which are a main ingredient of smog. It also slows the rate of combustion so that it is more likely to result in a controlled burn rather than a violent explosion that results in pinging.
When the EGR system isn’t coming on properly (insufficient flow) it results in higher nitrogen oxide emissions and can also cause your engine to ping–that rattle you may have noticed at times on acceleration. Chronic pinging can lead to severe engine damage. When it’s coming on too much or at the wrong times it can result in running rough or dying at idle, or sometimes surging at light throttle cruise.
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