Join Date: Jan 2017
Location: Minnesota. But don't tell the cops.
I too have the seat vibration. Definitely an rpm related issue. It shows up at lower gears if I go beyond normal shift rpm. In 5th gear it starts to vibrate at about 60+mph through maybe through 70+ and smoothing out past the 70+. Speedo is slow of course. Vibe felt only in the seat. I'm uncertain why a vibe would be just within a certain rpm range. But that's my 04 C. I hope we see more input on the topic. How do you test a vacuum line apart from visual? I'll check mount bolts although it didn't help you. Interesting, I was just going to post about this.
My 2004 1300C
Last edited by Cuthbert J Twillie; 07-28-2019 at 02:40 PM.