Identify this Sound...

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bdj5773

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A mechanic told me that a rod is knocking. However, I'm having second thoughts. Someone else said that it might be a timing chain slapping because tensioners have broke loose or something like that. The engine is still running and it will idle. However, after driving it around, when I take my foot off the gas, it will sometimes die. It will crank back up, however. There is no smoke either. I have driven the car for around 200 miles and no rod has thrown. So, I'm just wondering if this is really what it is?

I have tried to post a video with the sound but the file is too large (11MB). I can send to you if you think you can help me out. Thanks!
 
I just tried listening from a crappy phone. From the terrible audio (phone speakers) it almost sounded like you blew a plug. It's times like these I wish I owned a computer.
 
Not long before the knocking started, I had changed all 8 plugs and all 8 coils. So, it couldn't be that, could it?
 
I bet on reapers guess. He's probably listening through something worlds better than me. Though its not difficult to over-torque a plug and strip the aluminum head, there are WAY more timing chain tensioner issues than stripped head issues.

Easy to rule out the blown plug. Take a look at the coils, and see if any are blown out of the spark plug hole lol.
 
It's just hard to believe that a plug has blown out. How does that happen anyway and would it make that kind of knocking?
 
It is either timing chain slap or a rod knocking. But would a rod knocking cause the engine to want to die? And wouldn't there be smoke -- or not? The knock originally started off slight and then progressed more loudly.
 
All I'm going to say is if you want it to blow up.....keep driving it. If you want to save it start with the tensioner ....
 
bdj5773 said:
Maybe some others can listen to it and offer their expert opinion :D
Click to expand...

If it was to skip time it would surely die intermintenly till it just breaks and smokes a head and possibly a piston. I have heard this noise first hand but not quite as loud. If my pc speakers aren't decieving me I'd say a broken or near broken timing chain tensioner. I had a plug blow out of our 2000 ford expedition with the 5.4 triton which was an issue with that motor it sounds completely different in person. To pektels point the sound in the video is a bit hard to tell for sure.just my two cents
 
bdj5773 said:
... knock originally started off slight and then progressed more loudly.
Click to expand...

*only* after you put an additional further 200mi on it, go figure!

stop driving it and get it fixed, if not start looking for a new motor.

~ common sense prevails here ~


I'm not even listening to the audio clip,
my answer would be timing chain slap and the tensioners are already chewed off and laying around in spots it they shouldn't be.

You chain now has so much play in it, it's ready to start skipping on the teeth on the next hard WOT.

It's slapping against the inside of the motor where it rotates on the sprocket.


(searching for the thread with tons of pictures of opened motor showing the damage)
 
purevilpleasure said:
I've had plugs blow out of heads....that doesn't sound like that too me.
Click to expand...

Let me reiterate: I was listening through a straight talk phone's speaker, and only commented what it sounded like from this speaker. I put the disclaimer up for that purpose. I've had a plug blow in my LS, so I do know what it sounds like. I've also had a timing chain tensioner start to fail. Though not to the extreme as the sound in that video. When the mechanic changed mine, he did say it pretty much fell apart in his hands. Glad I knew the sound when I heard it while listening in person.

OP: is the sound coming from the front, underneath the valve cover? If so, secondary timing chain tensioner is your culprit. Iirc, the shop charged me $200 or so. I supplied the part, and new valve cover gasket set for that side for them.
 
BigRigLS said:
*only* after you put an additional further 200mi on it, go figure!

stop driving it and get it fixed, if not start looking for a new motor.

~ common sense prevails here ~


I'm not even listening to the audio clip,
my answer would be timing chain slap and the tensioners are already chewed off and laying around in spots it they shouldn't be.

You chain now has so much play in it, it's ready to start skipping on the teeth on the next hard WOT.

It's slapping against the inside of the motor where it rotates on the sprocket.


(searching for the thread with tons of pictures of opened motor showing the damage)
Click to expand...

^^^^^what he said^^^^^^
 
well i can tell you one thing for sure, it will only get much more worse unless you fix it now.

i would start at the timing chains look there, if your lucky, it will be there and you might have caught it before it has done some serious damage. if its not under the timing cover, either take it apart until you find the problem, or take it in and have someone figure it out for you and do the repair.
 
reaper76 said:
Also this video comes to mind!!!!
Click to expand...

i definitely could have done with out a 20 second musical introduction for each video! lol

also i like how he slipped in the Long John Silvers commercial at the end there.
 
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