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Old 06-23-2013, 10:28 PM   #1
sakipat
 
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Question PLEASE advise ( unnusual sounds )

I'll try and make this short...

I had some parts put in my LS3 about a month ago...
- Intake
- LT Headers
- Exhaust System

I never had a "modded" car before so I didn't know what to expect (other than reading threads here).

So, here are the 2 unusual sounds I've been noticing:

1. When the engine is cold, car sounds like a "fart can" when accelerating ( around 3-4 rpms )

2. When slowing down from a 30-40mph cruise, I hear popping sounds around the exhaust area.. 2 pops.... pause.. then another 2. and so on....

However, when the engine warms up, all is well.

Please Advise. Thank you.
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Old 06-23-2013, 10:32 PM   #2
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Quote:
Originally Posted by sakipat View Post
I'll try and make this short...

I had some parts put in my LS3 about a month ago...
- Intake
- LT Headers
- Exhaust System

I never had a "modded" car before so I didn't know what to expect (other than reading threads here).

So, here are the 2 unusual sounds I've been noticing:

1. When the engine is cold, car sounds like a "fart can" when accelerating ( around 3-4 rpms )

2. When slowing down from a 30-40mph cruise, I hear popping sounds around the exhaust area.. 2 pops.... pause.. then another 2. and so on....

However, when the engine warms up, all is well.

Please Advise. Thank you.


The slowing down noise is decel popping. You can search about it. Many cars have it. I believe it can be tuned out.

The fart can explanation I have no idea what you're trying to explain. Sorry.
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Old 06-24-2013, 01:14 AM   #3
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Thank you. I'll record audio tomorrow and post.
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Old 02-22-2014, 11:02 AM   #4
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This appears to be an old thread, but I too have an unusual sound coming from the back of my car. Seems to be "timed". About 5 minutes after I start my car, I get 5 taps in succession that seem to come from the trunk. No indications that anything is wrong, just "tap,tap,tap,tap,tap". They're faint enough that if I have any throttle going on, I can't hear them, but at a light they're quite noticeable.
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Old 02-22-2014, 11:07 AM   #5
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Originally Posted by txgoose View Post
This appears to be an old thread, but I too have an unusual sound coming from the back of my car. Seems to be "timed". About 5 minutes after I start my car, I get 5 taps in succession that seem to come from the trunk. No indications that anything is wrong, just "tap,tap,tap,tap,tap". They're faint enough that if I have any throttle going on, I can't hear them, but at a light they're quite noticeable.
My '07 Cobalt did the same thing and I never figured out wtf it was. People would always joke and ask if someone was locked in my trunk. Haven't heard it from my Camaro though.
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Old 02-22-2014, 11:17 AM   #6
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Its your exhaust. As it warms up the medal expands and make those noises. Since the pipes are all welded I would think its the mufflers. Should be nothing to worry about.
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Old 02-22-2014, 04:28 PM   #7
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Do you have an automatic? Could be AFM.
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Old 02-22-2014, 04:44 PM   #8
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Quote:
Originally Posted by txgoose View Post
This appears to be an old thread, but I too have an unusual sound coming from the back of my car. Seems to be "timed". About 5 minutes after I start my car, I get 5 taps in succession that seem to come from the trunk. No indications that anything is wrong, just "tap,tap,tap,tap,tap". They're faint enough that if I have any throttle going on, I can't hear them, but at a light they're quite noticeable.
What you are hearing is the evap solenoid going through it's test cycle to make sure it still works. It's normal. Louder on some cars then others.
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Old 02-22-2014, 04:50 PM   #9
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Originally Posted by stevey_frac View Post
What you are hearing is the evap solenoid going through it's test cycle to make sure it still works. It's normal. Louder on some cars then others.
On my 2009 Cobalt SS, when I installed the CAI, on cold start up it was loud.
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Old 02-22-2014, 10:38 PM   #10
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Quote:
Originally Posted by txgoose View Post
This appears to be an old thread, but I too have an unusual sound coming from the back of my car. Seems to be "timed". About 5 minutes after I start my car, I get 5 taps in succession that seem to come from the trunk. No indications that anything is wrong, just "tap,tap,tap,tap,tap". They're faint enough that if I have any throttle going on, I can't hear them, but at a light they're quite noticeable.
Sounds like the fuel system

http://www.camaro5.com/forums/showth...ferrerid=24831
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Old 02-22-2014, 11:04 PM   #11
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Quote:
Originally Posted by Supercharged SS View Post
The slowing down noise is decel popping. You can search about it. Many cars have it. I believe it can be tuned out.

The fart can explanation I have no idea what you're trying to explain. Sorry.

even get it with the NPP, like it
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