1993 Mazda RX-7 — buzzing noise only at one engine RPM

I'd keep this practical. Verify the cheap/easy branch on the 1993 Mazda RX-7 before a big repair or a big spend. That's where I'd start. A shop burned me once by skipping that step. I'll update if anything new shows up.

Write down what you already tried. A second data point from another 1993 Mazda RX-7 owner helps more than a generic diagnosis. That's where I'd start. This is from a 1993 Mazda RX-7 in Portland with 249,000 miles. Learned this the expensive way on a previous car. I'd rather be boring and correct. This is the version I'd tell a friend.

Don't overfit one forum story to your car. If it still isn't clear on the 1993 Mazda RX-7, a specialist hour can be cheaper than another round of parts. Then you'll know the next fork. No need to make it theatrical. A day of patience here is cheaper than a wrong part. I'm keeping receipts and dates in one folder.

Owner notes beat generic advice here. On the 1993 Mazda RX-7 in Portland, I'd fix the thing you'll notice every day before chasing spec-sheet extras. Then you'll know the next fork. On “7 — buzzing noise only at one,” that was the fork that mattered for me. Happy to compare notes if your setup is different. I'd rather look cautious in this thread than stuck later.