Strange sound from under the hood

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2003 Geee T said:
I noticed last night that when my car idles there is a faint random popping sound coming from under the hood. Its almost like a really quiet backfire. Anyone know what that could be?

i had what could be what youre referring to.

it sounds like a low deep bass hit, or like a bubble rising and popping on the surface of a pool. mine was coming from the stock airbox. a CAI cured that.
 
I also had that same sound coming from the passenger side of my motor and I had the head replaced due to a worn valve guide which caused the valve to bend and stick. The sound that it made was a type of hollow knock or echo through the valve cover and the intake. Truely a weird sound, Ford fixed it free, hope that is not what is coming from yours.

Ram
 
You might want to check and see if your MAF sensor needs cleaned. I was
having a problem with my car missing a little at idle. It turned out some oil from
my K&N had collected on my sensor. I just cleaned it off with a q-tip and some
alchohol and it was fine after that. Might work for you too.
 
2003 Geee T said:
You can hear it out the back at the exhaust tips too.

Ill have to check my MAF. I wonder why changing the CAI fixed it for thomas91169?

when I had a plug loose, you could hear that cylinder misfiring just by the sound of the exhaust, and it was a steady pop pop pop in the exhaust