2005 EX-L w RES
We started hearing a loud rattling or knocking noise coming from the bottom of the engine bay area immediately after starting up the car. The noise slowly fades away as the car warms up. It is the loudest immediately after starting up the car and then the noise goes away after 3~4 minutes of leaving the car running. I can't tell if the noise is coming from the engine or exhaust.
This problem started during on our road trip. We were driving back and forth to Las Vegas from L.A. and Grand Canyon. We started hearing the noise one morning and has never stopped. Once the noise goes away we don't hear anything until the next morning we start the car again. When driving the car we don't feel or hear anything strange. It only happens for just a few minutes after starting the car cold. Any idea? Do you think the noise is coming from the engine or exhaust system?