trunk knocking(sp?) - Cobalt SS Network



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Old 10-06-2007, 02:22 AM   #1
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trunk knocking(sp?)

i cant figure out what it is.. sometimes it makes it others it doesn't.. its 3 taps every time.. is it something adjusting by itself or what any one know?
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Old 10-06-2007, 02:26 AM   #2
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i cant figure out what it is.. sometimes it makes it others it doesn't.. its 3 taps every time.. is it something adjusting by itself or what any one know?
im not understanding the question. but maybe cuz its 2:30
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Old 10-06-2007, 02:31 AM   #3
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lol thats funny you say that. i couldnt figure it out either. but i know now it's just the fuel pump so dont be worried. unless you left someone in your trunk LOL.
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Old 10-06-2007, 02:33 AM   #4
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I could be wrong, but I always thought it was the trunk lock checking to make sure it's not ajar--mine does it a lot, especially after I turn off the car or park.
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Old 10-06-2007, 02:58 AM   #5
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There's a ghost in your trunk, say 4 million hail mary's, cover yourself with garlic and always keep a wooden stake and a silver bullet on hand in case the ghost has friends over of course
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Old 10-06-2007, 03:32 AM   #6
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my car also does this, i am glad someone posted a thread about this. i didnt want to make one and have no one know what i am talking about, and probably make fun of me and call me a retard(not like that has happened before or anything) are you sure it is the fuel pump?
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Old 10-06-2007, 03:34 AM   #7
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Yeah i heard it was just the fuel pump
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Old 10-06-2007, 03:37 AM   #8
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my car also does this, i am glad someone posted a thread about this. i didnt want to make one and have no one know what i am talking about, and probably make fun of me and call me a retard(not like that has happened before or anything) are you sure it is the fuel pump?
im almost positive. i remember even asking a gm tech what that sound was.. but anyways, it was also posted on hear a while ago that that noise was indeed the fuel pump.
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Old 10-06-2007, 03:44 AM   #9
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cool, thanks guys! i never thought anything was broken, it just boggled my mind, i was dying to figure out what was making that noise....lol now i know
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Old 10-06-2007, 06:13 PM   #10
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yeah i get it too. after the last 2 cars i've had, when i heard this i always got a littler nervous. every little noise i hear i think its my car falling apart. lol. not used to driving something nice!
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Old 10-06-2007, 06:17 PM   #11
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are you talking about the knocking noise it makes a little bit after you turn the car off? I think thats something to do with the battery/charging system...thats what i was told anyways
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Old 10-06-2007, 06:23 PM   #12
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I have a knocking in my trunk, it's a subwoofer
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Old 10-06-2007, 06:43 PM   #13
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It's the evap system purge canister. There is a TSB out telling the dealers not to replace it as it's not malfunctioing.

Sounds like someone knocking 3 times on the trunk.
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Old 10-06-2007, 08:43 PM   #14
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It's the evap system purge canister. There is a TSB out telling the dealers not to replace it as it's not malfunctioing.

Sounds like someone knocking 3 times on the trunk.
+1 good call. yes it is the evap purge system. not the fuel pump. yes it is normal for it to make that noise after shut down, and shortly after start up.
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Old 10-07-2007, 03:44 PM   #15
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When my tank is FULL, I get fuel sloshing back and forth that makes a knocking sound in the trunk.
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Old 10-07-2007, 03:47 PM   #16
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it is actually your evap canister cleaning itself
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Old 10-07-2007, 07:10 PM   #17
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no no no, you guys got it all wrong. what the knocking really is is the fuel leaving the supercharger and going back into the fuel cell. once you shut the car off some fuel is still left in the supercharger.








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Old 10-07-2007, 07:46 PM   #18
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good thread! i have this same problem!
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Old 10-07-2007, 08:16 PM   #19
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thought i was just crazy lol
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Old 10-07-2007, 09:17 PM   #20
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thought i was just crazy lol
don't worry about it.... you are
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Old 10-08-2007, 10:12 AM   #21
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Here's the TSB on the knocking noise. Some say it's the evil monkey in the trunk trying to get out HAHA.

Document ID# 1890375
2006 Chevrolet Cobalt


--------------------------------------------------------------------------------

Subject: Noise from Rear Of Vehicle - keywords canister cold CVS click evap knock L61 LE5 noise rear solenoid tick vent #PIC4317B - (01/23/2007)



Models: 2006-2007 Saturn ION

2006-2007 Chevrolet Cobalt

2007 Pontiac G5

2005-2007 Pontiac Pursuit

with Engine RPO L61 or LE5




--------------------------------------------------------------------------------

This PI is being superseded to update technical information. Please discard PIC4317A.


-
-------------------------------------------------------------------------------

The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this PI.

Condition/Concern:
A noise may be heard from the rear of vehicle; typically 3-5 knocks during initial cold start. The noise may sound like someone outside of the vehicle is tapping on the back window or on the rear exterior body panels.

Recommendation/Instructions:
This noise is from the vehicle's EVAP canister vent solenoid going through the diagnostic cleaning cycle, which is part of the software calibration set-up. Replacing the EVAP canister may not resolve the issue when the vehicle is re-exposed to a cold start. No parts should be replaced. This should be considered a normal condition for 2007 and previous model years.

Please follow this diagnostic or repair process thoroughly and complete each step. If the condition exhibited is resolved without completing every step, the remaining steps do not need to be performed.
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Old 10-12-2017, 07:29 AM   #22
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Trunk knocking

DEFINITELY a ghost .....I let my mechanic (yes I own a Hyundai and have a mechanic 4 er...lol) have my car all weekend and he never heard a sound ....ive taken it to him several times because of this reason but never hears it and says its A ...ok ??? Im nutz so ill be driving ...when the knocking starts im like STOP ...I SAID YOU AINT GETTING OUT ...juat lay back down and stop annoying the hell out of me ...I get looks ....Do I care ??? At least my windows have always been up 1 of these days sum1s actually going to hear my ******* and im gonna get stopped .....Lol .....mabey theyll know wht it is ...oh wait they wont hear it 😬🔫😬🔫😬🔫
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Old 10-12-2017, 09:44 AM   #23
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holy thread bump Tina
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Old 10-12-2017, 11:18 AM   #24
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What in the world??? I feel like I need to meet Tina in real life. I bet she's a riot.
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Old 10-12-2017, 11:49 AM   #25
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