Both technicians are correct. A stuck open EGR valve can cause idle problems, and a stuck closed EGR valve can increase HC emissions.
What is EGR valve?
A stuck open EGR valve is a common problem in automobile engines. It occurs when the EGR valve, which is responsible for controlling the amount of exhaust gases that are re-circulated back into the engine, stays open. This can cause a variety of issues, including increased emissions, decreased fuel economy, and decreased engine performance. The increased exhaust gases can also cause the engine to run too hot, which can lead to premature wear on internal components. In some cases, the engine may even stall or misfire. To fix this problem, the EGR valve must be replaced or repaired.
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