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Discussion Starter · #1 ·
I notice a humming noise when driving my 2001 frontier throughout the day. I parked and listened and seems to be coming from the back of the truck under the bed. I have video but can't upload it onto the site. Has anyone came across same humming sound?
 

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Fuel pump?

Exhaust vibration?
 

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my guess would be catalytic converter, like a pin hole

any water drip from your exshaust? Ive got some coming from just behind the cab and some from the tail pipe
 

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I'm not sure this would work (it did on my 03 Mustang) when the fuel pump was going bad, i could hear it making noise, when I turned the key on but did not start. It would hum, and it's not supposed to.
 
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