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knocking noise?

This is a discussion on knocking noise? within the General Help forums, part of the LSx Technical Help Section category; Ive got a 01 firehawk and have a knocking noise under my car. Something is moving or bumping under my ...

  1. #1
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    2001 pontiac firehawk

    knocking noise?

    Ive got a 01 firehawk and have a knocking noise under my car. Something is moving or bumping under my car. Ive taken it to numerous places but no seems to know what it is. the noise is behind me and i thought it might be my driveshaft but it looks fine. Ive got a 12 bolt rearend and all the sub frame connectors. Any ideas?

  2. #2
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    2002 TRANS AM WS6

    mine does that as well. i started a thread about it and got no real answers. i was told to check the exaust, but i know thats not it. does it sound like the spring is not set on it's perch right, so when you hit a bump there's a loud pop?

  3. #3
    sell out Mustang Killa's Avatar
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    2010 Black Camaro 2SS

    how consistent is the knocking?

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    2001 pontiac firehawk

    yea people told me it might be my exhaust as well since i have an electric cutout. but i dont think its it . The knocking is real consistent. i dont evan have to hit a bump for it to do it. if the road isnt paved right it will do. it seems like it does more when i put it in nuetral.

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    2001 pontiac firehawk

    The knocking is driving me crazy its downgrading my car

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    sell out Mustang Killa's Avatar
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    ok but how consistent is it?..all the time, does it come and go, get faster or louder w/acceleration?..

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    2001 pontiac firehawk

    no it stays the same. Sometimes when i shift at higher rpms i dont hear it but that could be cause my car is getting louder. It does it all the time when i driving around it doesnt evan have to be a bump, if the pavement is unevan you hear dump, dump, dump,. It seems like its worse when i put it in nuetral, just rolling to a stop. The noise is like right behind my elbow but i cant pin point it .

  8. #8
    sell out Mustang Killa's Avatar
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    i have a knocking noise but its just worn lifters with the combo of an aluminum block, drove me crazy and had me worried but i talked to a shop that specializes in F bodies and they said it was normal, the volume changes on my noise tho sometimes louder than others...does it make the noise in park?

  9. #9
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    2001 pontiac firehawk

    No this has nothing to do with my engine. its under the car and when i say knocking i mean it sounds like someone is knocking on your door exect under the car. like below my elbow into the back seat. You can actually feel the bump in the car.

  10. #10
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    pewter
    2000 WS6

    might be some slack in the drive shaft or maybe your torque arm is loose. my torque arm loosened on me and it made a knocking/banging sound. but that was only when i let off the gas or went into a turn with no gas

  11. #11
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    2000 WS6

    My '00 WS6 does the same thing. Only my knocking sounds like it's coming from somewhere near the rear passenger side axel area. I've read a few threads about the noise, but no one's ever pin pointed it. It's not my hatch, spare tire, springs, or shock. I've been up under the car numerous time tightening down anything I can tighten. Nada...

    Marc

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    2001 pontiac firehawk

    yea that sounds exactly like mine I might be the torque arm . Is it hard to tighten?

  13. #13
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    Try checking the transmission mount, its a rubber part thats right at the end of the transmission, right where your elbow is, perhaps that part is worn out and needs to be replaced. Easy to find part too. It might have cracked or something and so that bump is ur tranny moving around there. Hope this helps.
    "Well, he’s kind of had it in for me ever since I accidentally ran over his dog. Actually, replace “accidentally” with “repeatedly” and replace “dog” with “son.”

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    Senior Member 35thAnniZ28's Avatar
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    did you remember to bolt up the lca's with full weight on the ground?

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    2000 WS6

    Quote Originally Posted by 35thAnniZ28 View Post
    did you remember to bolt up the lca's with full weight on the ground?
    Yup... Suspension was fully loaded when tightening down LCAs. I'm gonna check the transmission mount as was mentioned, but I don't hold out much hope.

    I did read in a post once that the Torsen diffs have a tendency to make this light tapping kind of sound. The post also said that there wasn't anything you could do about it and it wasn't known to cause any problems.

    Marc

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    Quote Originally Posted by 6-Speeder View Post
    Try checking the transmission mount, its a rubber part thats right at the end of the transmission, right where your elbow is, perhaps that part is worn out and needs to be replaced. Easy to find part too. It might have cracked or something and so that bump is ur tranny moving around there. Hope this helps.
    I am with 6Speeder on this one.

  17. #17
    Veteran 0rion's Avatar
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    I'm with those guys....sounds like a tranny mount.

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