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Constent knock while car is cooling down...?

This is a discussion on Constent knock while car is cooling down...? within the General Help forums, part of the LSx Technical Help Section category; When I park my 2000 SS camaro at night after it being warm, i hear a constent knock its sounds ...

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    Constent knock while car is cooling down...?

    When I park my 2000 SS camaro at night after it being warm, i hear a constent knock its sounds like something is cooling down but im not sure exacly what it could be....does anybody have any idea on what it could be??

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    Your friendly policeman FinZ28's Avatar
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    I'm thinking it's your exhaust. How long does it knock after you shut it off?
    2001 Chevy Camaro Z28 A4
    SLP cold air intake/lid, SLP smooth bellow, Pacesetter LT's, ORY, Magnaflow exhaust, BMR STB, adjustable Panhard rod, SFC's, LCA's, 1LE sway bars, cross-drilled rotors

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    Member godless-phoenix's Avatar
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    Blackened fire chicken
    2000 Pontiac Trans Am WS6

    ive heard its because of the aluminum block expanding or contracting when its cooling down after you shut it off...i think i know what sound you're talking about. its almost like it will pop or "knock" a few times when the cars cooling down after its shut off...

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    None Shall Pass Knight's Avatar
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    Quote Originally Posted by FinZ28 View Post
    I'm thinking it's your exhaust. How long does it knock after you shut it off?
    This.

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    Quote Originally Posted by godless-phoenix View Post
    ive heard its because of the aluminum block expanding or contracting when its cooling down after you shut it off...i think i know what sound you're talking about. its almost like it will pop or "knock" a few times when the cars cooling down after its shut off...
    U know im not to sure how long it knocks for i park in the garage and i just go up into my room once i pull it in....but thats exaclly what it sounds like i could decribe it as the same sound u can make with your tounge u know that popping noise...but ya i'v heard that alum block thing too, i just didnt knock if they were talking about the noise while the car is on or off...

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    but its like clock work it dosent skip a beat

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    Your friendly policeman FinZ28's Avatar
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    Probably the easiest way to figure it out is to stay by the car for a few minutes after you shut it off and listen for the noise to try and pinpoint where it's coming from. Either way, it's nothing to be concerned about, at least I wouldn't think so, anyways.

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    its short but its skinny. jiveass's Avatar
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    my iron 5.3 does this ....didnt notice it when i had the ls1....i figured it could be thermostat doin it or somethin

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    Quote Originally Posted by jiveass View Post
    my iron 5.3 does this ....didnt notice it when i had the ls1....i figured it could be thermostat doin it or somethin
    Ya i hear it ur probably right nothing to be concerned about, just making sure my baby ain't about to blow up or anything lol....thanks for the help

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    One more thing guys since i got all u here......i just changed out my front roters and pads because i had heat spots on them really bad, my car is a little shy of 60k and if the back are anything like the front there factory roters, I dont really see any hotspots on them though but whenever i do some soft braking i get really bad brake feed on my pedal and my steering wheel and sometimes when i go down a hill really slow ill hear a knocking and a un balanced feeling as if my tires on crooked (which i know its not lol)....u guys think its just my roters being hot and warn out or do you think it could be something else???

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    Your friendly policeman FinZ28's Avatar
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    Might want to make sure your wheels & tires are balanced right. Front brakes tend to wear quicker than rears but you might need to look at your rear brakes, too.

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    Smiles for 9.5 Years cammed goat's Avatar
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    I agree about the knock being the pipes. They are cooling down. As for the brakes, sounds like your rotors are warped.

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    Former Mopar Man 2002ssslp's Avatar
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    Quote Originally Posted by Knight View Post
    This.

    Exhaust

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    i have longtubes and they f-in pop loud in cool down like someone else mentioned like clicking your tongue off the roof of your mouth lol

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    Your friendly policeman FinZ28's Avatar
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    Quote Originally Posted by robs98mysticZ:2774201
    i have longtubes and they f-in pop loud in cool down like someone else mentioned like clicking your tongue off the roof of your mouth lol
    Exactly what my car sounds like after I shut it off.

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