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Knocking noise, HELP!!!!!!!!!!!!!!!!

 
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SuperImpala00
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PostPosted: Thu Sep 20, 2012 9:55 pm    Post subject:  Knocking noise, HELP!!!!!!!!!!!!!!!! Reply with quote

alright guys need some opinions. 2000 base, 3.4 V6. Have been hearing a hollow knocking sound lately that I can only hear while inside the car. Lifting the hood I cannot hear it. Seems to occur in every gear except when putting it in Reverse, it goes away. While idling I can hear it enough to count each "knock" so I was thinking a valve, not sure. No oil consumption, no loss of MPG or anything out of the usual.
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Lingenfelter
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PostPosted: Fri Sep 21, 2012 12:20 am    Post subject:   Reply with quote

Video?

If it happens at a rate that you can count individual occurrences, I doubt it's a valve. Everything internal to the engine moves too fast for you to identify individual movements, even at idle.

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PushrodPower
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PostPosted: Fri Sep 21, 2012 12:45 am    Post subject:   Reply with quote

Check loose exhaust components/heat sheilds.

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Bill58
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PostPosted: Fri Sep 21, 2012 7:48 am    Post subject:   Reply with quote

Lingenfelter wrote:
Video?

If it happens at a rate that you can count individual occurrences, I doubt it's a valve. Everything internal to the engine moves too fast for you to identify individual movements, even at idle.

Rod knock and lifter tap absolutely can be heard. It's a really sickening sound if you appreciate motors.
http://www.youtube.com/watch?f.....CL7uNYPUMg (This is about as bad as it gets)
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Lingenfelter
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PostPosted: Fri Sep 21, 2012 12:13 pm    Post subject:   Reply with quote

Bill58 wrote:
Lingenfelter wrote:
Video?

If it happens at a rate that you can count individual occurrences, I doubt it's a valve. Everything internal to the engine moves too fast for you to identify individual movements, even at idle.

Rod knock and lifter tap absolutely can be heard. It's a really sickening sound if you appreciate motors.
http://www.youtube.com/watch?f.....CL7uNYPUMg (This is about as bad as it gets)


I can't watch youtube vids at work. Is rod and lifter noise actually slow enough to count individual 'knocks' or 'taps'? I'm under the impression he can sount them seperately as they happen.

Presumably idling at 600 rpm, you'd hear the sound 10 times per second, which I'd figure sounds more like banging or humming than something you'd count individual occurences of.

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SuperImpala00
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PostPosted: Fri Sep 21, 2012 2:01 pm    Post subject:   Reply with quote

Lingenfelter wrote:
Bill58 wrote:
Lingenfelter wrote:
Video?

If it happens at a rate that you can count individual occurrences, I doubt it's a valve. Everything internal to the engine moves too fast for you to identify individual movements, even at idle.

Rod knock and lifter tap absolutely can be heard. It's a really sickening sound if you appreciate motors.
http://www.youtube.com/watch?f.....CL7uNYPUMg (This is about as bad as it gets)


I can't watch youtube vids at work. Is rod and lifter noise actually slow enough to count individual 'knocks' or 'taps'? I'm under the impression he can sount them seperately as they happen.

Presumably idling at 600 rpm, you'd hear the sound 10 times per second, which I'd figure sounds more like banging or humming than something you'd count individual occurences of.


I'll try to post a video if I can, its not a fast knock more like a steady low sounding one. lol hard to explain, I've used a autoscope to try to pin point the noise but it doesn't seem to be coming from the engine. I can hear it at idle but when my rpm's go up it dissipates, than returns when the rpm's come back to idle speed. I was thinking carbon knock after discovering a few months ago it might have been running on 5 cylinders for a long while due to two of the spark plug wires being routed right on top of the EGR pipe and being burnt up.
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Pitch Black SS
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PostPosted: Fri Sep 21, 2012 2:55 pm    Post subject:   Reply with quote

Lingenfelter wrote:
Bill58 wrote:
Lingenfelter wrote:
Video?

If it happens at a rate that you can count individual occurrences, I doubt it's a valve. Everything internal to the engine moves too fast for you to identify individual movements, even at idle.

Rod knock and lifter tap absolutely can be heard. It's a really sickening sound if you appreciate motors.
http://www.youtube.com/watch?f.....CL7uNYPUMg (This is about as bad as it gets)


I can't watch youtube vids at work. Is rod and lifter noise actually slow enough to count individual 'knocks' or 'taps'? I'm under the impression he can sount them seperately as they happen.

Presumably idling at 600 rpm, you'd hear the sound 10 times per second, which I'd figure sounds more like banging or humming than something you'd count individual occurences of.


it takes 6 rotations of the crank to move all the pistons (1 piston per revolution), each valve only opens once for every 4 times the piston travels. (I think I got that right...lol)

8 rotations on a V8

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Bill58
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PostPosted: Fri Sep 21, 2012 4:38 pm    Post subject:   Reply with quote

Pitch Black SS wrote:
Lingenfelter wrote:
Bill58 wrote:
Lingenfelter wrote:
Video?

If it happens at a rate that you can count individual occurrences, I doubt it's a valve. Everything internal to the engine moves too fast for you to identify individual movements, even at idle.

Rod knock and lifter tap absolutely can be heard. It's a really sickening sound if you appreciate motors.
http://www.youtube.com/watch?f.....CL7uNYPUMg (This is about as bad as it gets)


I can't watch youtube vids at work. Is rod and lifter noise actually slow enough to count individual 'knocks' or 'taps'? I'm under the impression he can sount them seperately as they happen.

Presumably idling at 600 rpm, you'd hear the sound 10 times per second, which I'd figure sounds more like banging or humming than something you'd count individual occurences of.


it takes 6 rotations of the crank to move all the pistons (1 piston per revolution), each valve only opens once for every 4 times the piston travels. (I think I got that right...lol)

8 rotations on a V8

This is as basic as it gets people.....
1 rotation of crank moves all pistons up and down, 2 rotations 720* fires all pistons regardless of number of cylinders(in a 4-stroke motor).
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Pitch Black SS
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2004 Chevrolet Impala
1982 Chevrolet Malibu
2007 Chrysler 300C
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PostPosted: Fri Sep 21, 2012 5:38 pm    Post subject:   Reply with quote

Bill58 wrote:
This is as basic as it gets people.....
1 rotation of crank moves all pistons up and down, 2 rotations 720* fires all pistons regardless of number of cylinders(in a 4-stroke motor).


yeah, thats what I meant, knew it didnt sound right. Im sitting here trying to picture the inner workings of the motor as it spins while dealing with customers and running the machines...lol

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