Knocking Noise while stopped at the lights

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Knocking Noise while stopped at the lights

Postby Phong1704 » Mon Jul 20, 2015 9:59 am

Hey Guys,

My car has recently started making a knocking noise while in drive stopped at the traffic lights. It doesn't always happen, only when the car has warmed up, in drive and stopped - even still it the knocking noise doesn't always come on maybe 8 out of 10 stops. The knocking sound goes away when I start moving from the lights or when I put the car into neutral.

I drive an 07 Liberty GT Auto with dump & mid pipes, 3 port, and tune.

Any ideas what this could be? I'm rather concerned.

I also have a weird whining noise which i'm sure isn't induction or spool. it comes on when I step on the throttle half way.

Any advice would be greatly appreciated!
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Re: Knocking Noise while stopped at the lights

Postby bigBADbenny » Mon Jul 20, 2015 8:10 pm

Link a video with audio, from the cabin should be fine.
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Re: Knocking Noise while stopped at the lights

Postby Phong1704 » Mon Jul 20, 2015 9:21 pm

bigBADbenny wrote:Link a video with audio, from the cabin should be fine.


Hey Ben, I just posted it on the the fb page.
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Re: Knocking Noise while stopped at the lights

Postby bigBADbenny » Mon Jul 20, 2015 10:16 pm

Hard to say, maybe check for an exhaust leak?
Spray soapy water on suspect areas on cold start...
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Re: Knocking Noise while stopped at the lights

Postby Phong1704 » Tue Jul 21, 2015 9:27 am

Wouldn't an exhaust leak make that sound all the time though? once it's in neutral or I start moving the noise goes away.
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Re: Knocking Noise while stopped at the lights

Postby THE SpecB » Sun Aug 23, 2015 7:33 pm

Phong1704 wrote:Wouldn't an exhaust leak make that sound all the time though? once it's in neutral or I start moving the noise goes away.

Bump
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