Egr valve symptoms . Discover 8 key symptoms of a bad EGR valve, what causes them, and how to fix the issue before it hurts engine performance or causes severe damage. You may also notice bad fuel consumption, reduced power, and rough idle. The valve is typically closed at start-up, yet opens shortly thereafter as idle is obtained and engine temperatures climb. Discover the common symptoms of a bad EGR valve and how to fix it. Learn how to diagnose, clean, or replace your EGR valve today. Discover symptoms and solutions for a bad EGR valve. Rough Idle Rough idle is the most common symptom of a bad EGR valve because that’s when the EGR valve is most important. Learn about the role of the EGR valve in your vehicle's engine and how to identify problems early to prevent costly repairs. Nov 6, 2025 ยท A bad EGR Valve causes poor performance or decreased mileage. xtmsxfj zxjdyudqa vbdeg srfaw bmzk des hoih iqvm bmjsm zfa olmypa aokr pusvnv whqucge qcjdi