I noticed a low frequency boom noise (like a very deep bass boom) coming from the engine/exhaust yesterday and again today when I took my 1998 NSX for a drive. Details are:
Does any one have any ideas what could be causing this?
- Frequency is around 2-4 booms per second, no real pattern as far as I can tell.
- Only happens when engine has warmed up to operating temperature (no noise when engine is cold).
- Noise is loud enough to be heard from inside the car with the targa top off.
- I only drive my NSX about once a month, approx 10-20 miles each time.
- Last fuel fill was 3+ months ago.
- 46k miles on the clock.
- Last oil change was about 1 year ago.
- Car is unmodified other than an oil based air filter.
- No check engine lights etc and car drives and accelerates fine.
Does any one have any ideas what could be causing this?
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