strange pop noise when sitting
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Junior Member
Joined: Jul 2004
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strange pop noise when sitting
My car makes this strange noise when its just sitting there after driving it. Usually a few minutes after I stop a sound that resembles a dent in a piece of sheet metal getting popped out, happens(like in those dent king commericals). I have no clue as to what it could be. The car is always off when it happens so I don't think its the exhust. Any ideas?
Supreme Member
Joined: Apr 2002
Posts: 3,552
Likes: 5
From: New Jersey
Car: 86 Corvette, 89 IROC, 1999 TA
Engine: 350, 350, LS1
Transmission: 700r4, 700r4, T-56
Axle/Gears: 3.07, 373, 4.10
I would have to guess that its your gas tank popping back out after attempting to implode itself due to poor ventalation.
Senior Member
Joined: Dec 2003
Posts: 647
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From: Oklahoma
Car: 1991 Trans AM GTA
Engine: 5.7L TPI
Transmission: 700R4
I hear the same noise when I shut my car off. Have been wondering what it could be. I think it is possibly the exhaust though, because it didn't do it before i had all custom work done on the exhaust.
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Joined: Jul 1999
Posts: 18,457
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From: Loveland, OH, US
Car: 4
Engine: 6
Transmission: 5
It's usually the gas tank.
Go fill the car up with gas, then park it without driving it real far, I'll bet it doesn't do it. It's usually at its worst when you are near empty and park it after a long drive.
New exhaust might affect it, because the muffler is IMMEDIATELY UNDERNEATH the gas tank.
It's not "poor ventilation"; these cars, like all cars since the late 70s, are designed to hold considerable pressure in the tank. In fact in places that have relatively strict emissions inspection, they take the gas cap off and test it to make sure it holds several psi without leaking. They're not supposed to "vent" the tank like old cars did, because that just spews raw fuel into the atmosphere.
Bottom line: it's normal.
Go fill the car up with gas, then park it without driving it real far, I'll bet it doesn't do it. It's usually at its worst when you are near empty and park it after a long drive.
New exhaust might affect it, because the muffler is IMMEDIATELY UNDERNEATH the gas tank.
It's not "poor ventilation"; these cars, like all cars since the late 70s, are designed to hold considerable pressure in the tank. In fact in places that have relatively strict emissions inspection, they take the gas cap off and test it to make sure it holds several psi without leaking. They're not supposed to "vent" the tank like old cars did, because that just spews raw fuel into the atmosphere.
Bottom line: it's normal.
Senior Member
Joined: Dec 2003
Posts: 647
Likes: 0
From: Oklahoma
Car: 1991 Trans AM GTA
Engine: 5.7L TPI
Transmission: 700R4
Originally posted by RB83L69
It's usually the gas tank.
Go fill the car up with gas, then park it without driving it real far, I'll bet it doesn't do it. It's usually at its worst when you are near empty and park it after a long drive.
New exhaust might affect it, because the muffler is IMMEDIATELY UNDERNEATH the gas tank.
It's not "poor ventilation"; these cars, like all cars since the late 70s, are designed to hold considerable pressure in the tank. In fact in places that have relatively strict emissions inspection, they take the gas cap off and test it to make sure it holds several psi without leaking. They're not supposed to "vent" the tank like old cars did, because that just spews raw fuel into the atmosphere.
Bottom line: it's normal.
It's usually the gas tank.
Go fill the car up with gas, then park it without driving it real far, I'll bet it doesn't do it. It's usually at its worst when you are near empty and park it after a long drive.
New exhaust might affect it, because the muffler is IMMEDIATELY UNDERNEATH the gas tank.
It's not "poor ventilation"; these cars, like all cars since the late 70s, are designed to hold considerable pressure in the tank. In fact in places that have relatively strict emissions inspection, they take the gas cap off and test it to make sure it holds several psi without leaking. They're not supposed to "vent" the tank like old cars did, because that just spews raw fuel into the atmosphere.
Bottom line: it's normal.
Supreme Member
Joined: Oct 2001
Posts: 8,113
Likes: 6
From: NWOhioToledoArea
Car: 86-FireBird
Engine: -MPFI
Transmission: T5
Axle/Gears: 3:42
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