AboutMp2 Expertise I prefer to answer questions relating to the Miata since this has been my area of specific
expertise since 1991. I can answer questions relating to the other Mazda models however
some limitation of expertise may reduce my accuracy.
Experience Mazda technician since 1987, shop owner and specialty are regarding the Miata since 1991 covering mechanical, electrical, trim and body. Specializing specifically in drivability concerns.GKHS 1985, BVC 1987, MNA 1989, ASE Master Technician Mechanical 1995, ASE Master Body/Paint/Collision 1996
Education/Credentials GKHS 1985, BVC 1987, MNA 1989, ASE Master Technician Mechanical 1995, ASE Master Body/Paint/Collision 1996
Question I hear a noise inside the care when I am driving. My odometer starts shaking and that is when i hear the noise. Does that mean I have to replace the odometer cord. Or what could it be
Answer As the speedometer cables helical shaft begins to fail it makes a "warbling" noise (best description) which appears to come from the center dash/cowl. In unison the needle tends to hop or flutter in response usually below 40 MPH. The most common fix is to replace the cable. It runs $86.30 from Mazda and takes some talent and flexibility to replace, usually 1.2 billed hours.
Here we make a service fitting for the cable which allows you to inject low viscosity grease into the helical shaft assembly thereby extending its service life. The tool sells for $29.95, NAO1-513-SC. Depending on how much wear has occurred to the helical shaft lubricating seems to resolve the issue also.
