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Q:Is it hard to replace the egr line
A:It depends upon the skill level of the person performing the operation, some might take more time.
Q:what does the egr tube do, and what will happen if it leaks at the exhaust manifold?
A:EGR valve: route a small amount of exhaust back into the combustion chamber. When the temperature in the combustion chamber is too high, nitrogen oxides are produced-combine with elements in the atmosphere- form smog. Introducing a small amount of exhaust into the system reduces the temperature in the combustion chamber, reducing the amount of nitrogen oxides produced.Malfunctioning EGR can cause irregularities in engine performance such as rough idling or valve knock.