A defective EGR valve can cause a popping or knocking noise from the engine compartment. It is usually heard when the engine is warm (between 1600 and 1800 RPM).
RepairPal Car Genius™ is a free resource for vehicle owners seeking advice on maintenance, auto repair, shop inquiries, estimates, and finding a trustworthy repair shop in your area.
Call us at 877-913-1554
Available 9am – 6pm ET Monday through Friday