This is a fluttering sound on my truck. It kicks off when the governor kicks on. Does anyone know what this is or have experience with this sound? Watch the video I have attached for reference. https://youtube.com/shorts/jdQUqqwRKU4?si=M6T4PZNyWjPPDXq8
Dd series engs are noisey when compressor is unloaded. Open hood on drivers side at rear of motor u will see a 1 in tube going from air cleaner ducting down to top of compressor. If it is attached and no damage. What you hear is probably normal. You will only hear this noise after air drier purges
