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Old August 28th, 2014, 05:23 PM   #1
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Need some help with a weird noise

Ok guys i have a 06 av6 auto and I am experiencing a strange knocking sound from my engine. I checked the oil level and it is perfect just changed it less than 2k miles ago with Mobil 1 synthetic every time. I unplugged the coil pack at idle one by one and noise did not disappear. I am baffled as to what this noise is, noise is coming from the rear bank and the car still runs exactly the same no power loss or anything like that. So any help is appreciated, I really dont want to put a new motor in this or get any major work done, it only has 129k on the odo.

This video is at idle: &mpt=[CACHEBUSTER]">


This one is revving at 1.5k rpm, 2k, 2.5k, 3k, 3.5k, and then just feathering it.

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Old August 28th, 2014, 05:31 PM   #2
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wtf? sounds like a diesel. Try doing a valve adjustment. Also check the rear cat to see if it loose or broken inside. Besides that i Ono maybe your motor gone
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Old August 28th, 2014, 05:41 PM   #3
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Did u ever over rev your engine?
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Old August 28th, 2014, 05:42 PM   #4
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I did and I broke 5 rocker arm bearings and it sounded like that. Mine wasn't quite as loud though. And it sounds like yours is coming more from the bottom of the engine? ?? But idk beyond that
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Old August 28th, 2014, 05:52 PM   #5
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I normally dont rev my engine and if I did it wouldnt be past 4k rpm. It seems like the noise is coming from underneath the car, but it may just seem like that because the way noise travels.
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Old August 28th, 2014, 05:56 PM   #6
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Check for loose heat shield
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Old August 28th, 2014, 06:01 PM   #7
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nothing is loose everything is nice n tight. Also no check engine light or anything like that still drives the same far as i can tell.
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Old August 28th, 2014, 06:18 PM   #8
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just take it to a mechanic. There nothing more we can really suggest.
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Old August 28th, 2014, 06:27 PM   #9
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I took it to a honda specialist in my area and he was not able to correctly identify the problem. And if its going to cost more than a grand to get it fixed im pretty sure im just gonna sell it.
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Old August 28th, 2014, 06:46 PM   #10
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Sound like rod knock to me. Could be valve related but doubt it. Next time you change you oil (or do it now !! ) put a coffee filter under the oil when it draining and look for anything shiny in the coffee filter. Pretty sure you'll see something with that much noise. You can also pull the valve covers and check the heads.

It will cost well over $1k, most likely you need a new engine. Sorry for the bad news. Could be wrong but doubt it
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Old August 28th, 2014, 06:50 PM   #11
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Just my luck that this happened to me. The whole reason I kept this car in the first place was because im moving for school and its been so reliable to me, that I was going to keep it for the time being. Was gonna sell it couple months back.
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Old August 28th, 2014, 06:51 PM   #12
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Pull those valve covers and check those heads (valves, rockers, etc). I could hear what sounded like normal operating heads and the knocking definitely got louder when you went down to the block. You should be able to tell pretty quick if its the heads once the valve covers are off
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Old August 28th, 2014, 06:51 PM   #13
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Also mechanic said it could possibly be slack in the timing belt for the rear bank, but idk how correct that is.
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Old August 28th, 2014, 06:54 PM   #14
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Once I pull the valve covers what exactly should I be looking for?
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Old August 28th, 2014, 06:56 PM   #15
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^ you left that out. If there is slack and the timing is off, it could be a bent valve and not rod knock. Ill say it again, best course of action is to pull the valve covers first
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Old August 28th, 2014, 07:01 PM   #16
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He said maybe he is not 100% sure
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Old August 28th, 2014, 07:02 PM   #17
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Anything broken, bent or out of alighnment. Rotate the engine from the crank pulley (bein sure to check the cylinder the compression stroke is on) and try to determine if all the valves are moving up and down equally. If one doesn't go up or down as far, then that valve is bent.

I have a hunch its a bent rod. How many miles on the car and you sure you didn't drive hard or misshift recently ?
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Old August 28th, 2014, 07:07 PM   #18
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Sorry for blasting your thread but here's and easier route. Get a mechanic stethoscope and listen for where the sound is coming from. This by far the easiest and quicker route, no engine disassembly. Sorry I forgot about this and sure am damn surprised your mechanic didn't do this simple trick.

Harbor freight sell the mechanic stethoscope for like $10 !
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Old August 28th, 2014, 07:31 PM   #19
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Car has 129K on it ive owned it since 46k. I dont rev the hell out of my car, and I dont race my car or anything but I do give it some lead foot every now and then just for a few minutes, nothing too crazy.
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Old September 25th, 2014, 05:36 PM   #20
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Update: So I decided to just suck it up and go to a honda dealer and have them check it out. Turned out to be my flex plate attached to the torque converter was cracked and needed to be replaced.So was not a rod knock or anything of that sort and drivers perfectly fine now.
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