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On engines that come with it you definitely want it to be functioning. I know that on the Nissan KA that if you do not clean out the EGR jet ports on the intake manifold every so often the engine will miss and run rough at idle. Fortunately though there are clean out plugs for them on the intake manifold and all you have to do is unscrew them and run a long, sharp awl through them to clean them out.
On the Suzuki G10 in the Metro/Swift/Firefly/Barina/Cultus, a poorly functioning EGR system (when used) will cause the engine to burn the exhaust valves because they will run too hot. Not only that, but it will negatively impact fuel economy as well. The computer is programmed with the EGR in mind and removing it can cause engine damage.
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No green technology will ever make a substantive environmental impact until it is economically viable for most people to use it. This must be from a reduction in net cost of the new technology, not an increase in the cost of the old technology through taxation
(Note: the car sees 100% city driving and is EPA rated at 37 mpg city)
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