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 have a 90 miata with 123 k miles. every time i start it it gets a annoying whining or squealing sound. my mechanic said it should be the belts but need to know if it could be something else so i can go to a shop and specifically ask what i want.
Answer If it is the belts the they are either loose or worn. Engine off you should be able to tug on them to see if they feel loose. Most common is the alternator belt since it was a v groove design in the early years, more prone to stretching. Grab a flashlight take a look, if they show signs of cracking or fraying it's time for new belts.
The noise is most likely is belt related however, squealing could also be fan motor related or even clutch pilot or release bearing related. Each has a distinctly different noise associated with it but, customers commonly think squealing is belt related.
123k is still a baby around this place. Our oldest is 436k.
Your biggest area of concern should revolve around timing belt services, front oil seal and most importantly crankshaft keyway fitment, done improperly can lead to crankshaft failure. Be cautious if your not aware this has led to the demise of many 1990 model Miatas.
