Low frequency boom noise from engine/exhaust

Joined
22 July 2010
Messages
87
Location
Seattle, WA
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:


  • 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?
 
Last edited:
Exhaust leaks are typically very easy to fix. Just replace the associated gasket which has worn out typically due to age.
 
Exhaust leaks is a good area to check.
I've also had booming noises which turned out to be tire noise and was more noisier on some road surfaces.

yep tires especially when worn
 
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