do torques make sounds?
Thread Starter
TECH Apprentice
Joined: Oct 2006
Posts: 371
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From: midwest
do torques make sounds? do they? like i think mine does. i dont know but when i slowly accelerate fro 0-15 and release the pedal(and sometimes no release) i hear this thug or pop sound underneath my car. any idea to what this is guys? thanks
Thread Starter
TECH Apprentice
Joined: Oct 2006
Posts: 371
Likes: 0
From: midwest
oh thanks... but is backfire bad? is that normal? does everyone experience this? how come my previous cars didnt do this? (previous cars - nissan bluebird, hyundai elantra, hyundai scoupe, pontiac grand am)
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TECH Senior Member
Joined: Jan 2004
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From: St.Charles MO
Originally Posted by Nickstock98t/a
do they? like i think mine does. i dont know but when i slowly accelerate fro 0-15 and release the pedal(and sometimes no release) i hear this thug or pop sound underneath my car. any idea to what this is guys? thanks
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Originally Posted by KrazyDan
its not bad. when you let off the pedal, a little cold air get sucked back into your exhaust and makes a little backfire. Its normal. You have nothing to worry about
TECH Fanatic
Joined: Jan 2003
Posts: 1,415
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From: San Diego/Schertz,Texas
Originally Posted by BrandonDrecksage
its not the cold air. Its the exhaust fuel popping in the exhaust. Its also known as afterfire, not backfire. Backfire is when the explosion goes foward through your intake mani. happens in nitrous cars when fuel puddles in the intake manifold. Car probably only does it when its cold because the cats haven't gone up to temp yet. other cars probably didn't do it because they didn't run as rich as the ls1 does.
TECH Addict
Joined: Jun 2005
Posts: 2,660
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From: England
Originally Posted by Nickstock98t/a
do they? like i think mine does. i dont know but when i slowly accelerate fro 0-15 and release the pedal(and sometimes no release) i hear this thug or pop sound underneath my car. any idea to what this is guys? thanks
TECH Addict
Joined: Jun 2005
Posts: 2,660
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From: England
Originally Posted by KrazyDan
its not bad. when you let off the pedal, a little cold air get sucked back into your exhaust and makes a little backfire. Its normal. You have nothing to worry about
An engine is just a large piston air pump. If you could spin the motor over at say 2000rpm without it running it would still make a noise.
Air being sucked in, compressed in the combustion chambed and vented out via the exhaust. When down revving that is basically what is happening.
Joined: Apr 2006
Posts: 3,909
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From: Grand Rapids, Michigan
Originally Posted by Nickstock98t/a
do they? like i think mine does. i dont know but when i slowly accelerate fro 0-15 and release the pedal(and sometimes no release) i hear this thug or pop sound underneath my car. any idea to what this is guys? thanks
Yeah, sometimes I hear a "thug" sound underneath my car too. Usually happens after I run over a gangsta rapper. Obviously nothing to worry about!
