X15 noise and lack of power on a hard pull.

[Camstyn]

Yup, probably not what you wanted to hear but you are getting good advice here. Either get your transmission reprogrammed to keep above 1400rpm or use the manual mode on the shifter to do it yourself to avoid ruining the engine. Hopefully whatever you’re noticing with it now isn’t anything major, but running that engine hard at low RPM’s is going to cause you big problems.

My X15 starts to feel and sound unhappy at anything under 1400rpm, vibration and noises that are avoidable by keeping the RPM’s up out of that range.