Hey all, I’m on my second day solo and I’ve already asked my DM more questions than they’re paid to answer so I thought I might pick your collective brains.
My first night and all the nights I’ve had with my trainer this wasn’t an issue but all of a sudden tonight it is. When opti idle kicks on the truck has started making a rhythmic revving noise (That’s the best way I’ve thought of describing it). It’s like a steady 160bpm on and off revving noise, and it’s usually accompanied with a single hiss right as it cycles the first time. It sounds like revving but I don’t see the rpm’s go up on the gauge. Once it’s on for a bit it stops and runs like it has before. Any idea what this could be? Thanks in advance!

