Posted on 8/28/2026
A restricted catalytic converter does not always make the car feel terrible right away. You may notice that it still starts fine, idles reasonably well, and handles light driving without much trouble. Then you ask for more power, and the engine suddenly feels like it is working against something. That change under load is an important clue. The converter sits in the exhaust stream, so when its internal passages begin to plug or collapse, exhaust gases have a harder time leaving the engine. The restriction can build gradually enough that the driver gets used to the loss of performance. Power Drops When You Accelerate Hard One of the more common complaints we hear is that the car feels acceptable around town but weak when merging, climbing a hill, or accelerating at higher RPM. The engine sounds like it is trying, yet the vehicle does not pick up speed the way it should. That happens because an engine needs to breathe in and breathe out. If exhaust cannot leave quick ... read more