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Old 03-16-2012, 08:55 AM   #1
queenz700xx
 
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Trunk Knocking

Has anyone else head the knocking sound coming from the trunk when you cold start the car and the coolant temp reaches about 140 degrees. It is 5 consecutive knocks followed by a single knock about a minute after. It happens every time
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Old 03-16-2012, 08:56 AM   #2
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I have heard a tapping sound a couple of times. Someone explained what it was a while back, but of course I forget now. Normal operation.
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Old 03-16-2012, 09:04 AM   #3
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haha good the first time it happened i thought someone was tapping on my trunk or a tree branch fell since no one was there. that walk to see if there was any damage on the car from a damm branch scared me.
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Old 03-16-2012, 09:06 AM   #4
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I don't have my car yet so I can't say, but my Saturn does this. After a drive somewhere I'll park hear like 4-5 knocks come from the trunk. Sounds like someone tapping a drumstick on a wooden table. It doesn't happen every time.... but definitely strange.
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Old 03-16-2012, 09:13 AM   #5
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I forget exactly what it is but I believe it has to do with the fuel pump
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Old 03-16-2012, 09:14 AM   #6
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Quote:
Originally Posted by Nameless View Post
I don't have my car yet so I can't say, but my Saturn does this. After a drive somewhere I'll park hear like 4-5 knocks come from the trunk. Sounds like someone tapping a drumstick on a wooden table. It doesn't happen every time.... but definitely strange.
I have heard this too. I know it's normal, but what is it that causes this?
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Old 03-16-2012, 09:14 AM   #7
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Fuel system check or something like that. It's normal.
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Old 03-16-2012, 09:16 AM   #8
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thats good to know. i had a feeling it had something to do with the fuel system
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Old 03-16-2012, 09:20 AM   #9
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Did you let the trunk monkey out? Sometimes they need a break. It gets stuffy in there!
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Old 03-16-2012, 09:26 AM   #10
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Normal. It is your fuel recovery system operating.
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Old 03-16-2012, 09:30 AM   #11
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Old 03-16-2012, 09:32 AM   #12
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Old 03-16-2012, 09:52 AM   #13
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I had the same question a few weeks ago, and someone on the board knew what I was talking about. Said it was the EVAP system. I hear it also. Nothing to worry about, it's normal.
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Old 03-16-2012, 09:56 AM   #14
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Not a single Shunt joke??? I'm appalled!


Everyone here knows damned well what that noise is
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