I have a 2013 Juke Nismo that I drive quite a lot. It’s currently at 73k miles and I’ve had it for just over 3 years. That said, it’s always driven very well with no major issues, but there are some minor issues that I am worried about.
when the car heats up, after about 20-30 minutes of driving, the engine produces a loud, high pitched whine, simily to a supercharger sound that gets higher and lower as the engine revs higher or lower. This is a cvt transmission so the rpms can actually go down as the car accelerates, but the whine follows the rpm, not the speed. I thought this might be an indication that I needed to replace the cvt fluid, and I did that, but it was no help.
occasionally, when sitting at idle, the cars rpms will drop from the usual idle of about 750 rpms. The needle doesn’t “hunt”, the rpms just dip for a second and then they come back to normal. But the dip is enough to where the car will shudder a little bit as if it’s about to stall. The weirdest thing is that I have noticed that I can actually cause the shudder to happen if I pull back on the power window lever if the window is already up, which makes me think the problem might be electrical or in some way related to the alternator.
Any ideas? Should I be worried about either of these two problems?