04-18-2008, 03:00 PM
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Somebody in my trunk!
Does anybody know what might cause a knocking coming from the back of the vehicle. It really does sound as if somebody was knocking on the trunk lid from the inside. The first time it happened when I just started the engine, just three knocks in quick succession. I shut it down and restarted, same thing. Then nothing for about two weeks and one morning it happened again when I started her up. This time I was able to determine it’s definitely originating at the rear of the vehicle. I immediately thought, "fuel pump" although there has so far not been any effect on the engine's preformance. This afternoon when I got home and shut down, I remained in the car for about five minutes reading something from work when I heard it again, without the electrical on. Although it didn’t sound as loud as before, it was four distinctive raps coming from the back end. It’s only happened about half a dozen times since late February, once while driving and rounding a turn (if that could mean anything). I plan on telling my dealer when I take it in for an oil change but I’d like to have some kind of idea what it is when I do. Other then this the car runs like a dream. Any ideas out there?
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You don't like your job, you don't strike. You go in every day and do it really half-assed. That's the American way. -Homer Simpson 
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04-18-2008, 03:08 PM
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OMG I thought I was the only one hearing that! I don't know what it could be, but it really does sound like somebody knocking. Only thing I can think of is something or other heating up/cooling down, but I honestly don't know.
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 White '07 LT coupe. Purple racing stripes, seatcovers, steering wheel cover, pedals and front bowtie. Rear debadged. Front grilles covered. Tuner style spoiler. Drag DR21 rims.
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04-18-2008, 04:00 PM
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I am pretty sure the fuel pump is in the back near the trunk.
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 Mod's So Far: AEM CAI, Tinted, Totally Debadged, Custom front SS bumper, Lower Billett Grille, DC Carbon Strut Bar, 2.5 Magnaflow Catback Exhaust and dropped on Progress Springs. Future Mods: In Order - Rimmies, Intake Mainfold Swap, Drilled and Slotted Rotors, Trans Mounts, Short Throw Shifter, Internals, Ingalls Stiffy Torque Dampner
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04-18-2008, 04:22 PM
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holy SHYT i hear it too!!!
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04-18-2008, 05:36 PM
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dude i hear it too!!!! i always freaked out but now i try to jump out of my car after i shut it off to hear where its coming from. it always happens about 20 seconds after my car turns off.
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O7 BLACK LS 5-SPD - debadged (badged inside) - black bowties - black painted interior - black halo projectors - under-dash blue neons - front lip LEDs - 2 12" Insignia's w600w - 20%, 5% tint - air-box mod
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04-18-2008, 06:03 PM
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At quick glance the first thing that came to my attention is our's are all '07s, anyway it's just an observation. I'm leaning towards the fuel pump, but the fact that I still heard it when I had the ignition off and no electrical power going to the pump makes me rethink.
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You don't like your job, you don't strike. You go in every day and do it really half-assed. That's the American way. -Homer Simpson
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04-18-2008, 06:19 PM
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i have heard mine driving down the road... never when it is shut off tho
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04-18-2008, 06:51 PM
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Any of you guys have the premium sound package?????
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Cobaltkrazy: Turning aftermarket parts to dust, since 2006!!!
http://www.facebook.com/group.php?gi...3784350&ref=nf How to post pics: http://www.yourcobalt.com/forums/ins...tml#post169806
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04-18-2008, 08:36 PM
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Mine does it too. Some days it happens and some days it doesn't...I too have an '07.
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04-18-2008, 09:02 PM
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06 Cobalt
Mine does it too. I have an 06 Cobalt LT. I dont think it is the sound system because it used to do it when I had regular speakers in the doors and now it still does it when I upgraded everything on the inside of my car. It is always three knocks about 20 to 30 seconds after I turn the car off.
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