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Camaro V8 LS3 / L99 Engine, Exhaust, and Bolt-Ons Bolt-Ons | Intakes | Exhaust

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Old 04-24-2013, 07:52 AM   #1
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[UPDATE]: Rattling/Tapping sound coming from engine (2SS)

I posted a few days ago, with a video from under the car, of a tapping/rattling sound coming from under the car. I got back ideas of exhaust leak, bad lifter, loose metal, etc. I sent the video link to my dealer and their service tech said if it isn't louder under the hood then it may not be a lifter and could just be an exhaust leak. I'll be taking it in there in a day or 2 to have it looked at, but I decided to pop the hood and see if it was louder or not. Here is the sound:

Should I be worried?

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Old 04-24-2013, 09:00 AM   #2
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I honestly don't hear anything strange.
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Last edited by nyrfan; 04-24-2013 at 09:23 AM.
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Old 04-24-2013, 09:12 AM   #3
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You have eased my concerns.
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Old 04-24-2013, 12:04 PM   #4
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Video is pretty clear but still hard to hear since its still a video, sounds like normal valve train noise though if you ask me.
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Old 04-24-2013, 12:08 PM   #5
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these cars have a sewing machine sound to them. some ppl recommend running about 7 quarts of oil instead of 8 or 9. cause the crank mixes the oil and causes air bubbles. which is where the noise is coming from. not enuff oil being pumped to the top . thats something u will have to decide. but thats a pretty common noise i hear it tho.
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Old 04-24-2013, 12:19 PM   #6
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these cars have a sewing machine sound to them. some ppl recommend running about 7 quarts of oil instead of 8 or 9. cause the crank mixes the oil and causes air bubbles. which is where the noise is coming from. not enuff oil being pumped to the top . thats something u will have to decide. but thats a pretty common noise i hear it tho.
I've read this about the oil and find it somewhat true. I used 7.5 qt's last oil change and the engine is much quieter.
I've also heard that Pennzoil Platinum also helps to quiet the lifters; I will be switching to this on my next oil change.

But who uses 9, the car calls for 8qt's?
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Old 04-24-2013, 12:28 PM   #7
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When I had it taken in for my oil change (at the dealer) about 2-3 weeks ago at 5k miles, they commented on the fact that it took 8.5 qrts. This might explain some things...

I went with Mobile 1 synthetic, but maybe I'll take it in again at 8k and tell them to oil do 7.5
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Old 04-24-2013, 12:30 PM   #8
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When I had it taken in for my oil change (at the dealer) about 2-3 weeks ago at 5k miles, they commented on the fact that it took 8.5 qrts. This might explain some things...

I went with Mobile 1 synthetic, but maybe I'll take it in again at 8k and tell them to oil do 7.5
8.5? The manual clearly says 8qt, I can assure you this is part of your problem.

I'd highly recommend draining a bit out, more oil can be worse on an engine then less oil.

I also wound never go 8K between changes, but that's another debate.

This is from the manual:

6.2L V8 Engine 7.6 L 8.0 qt
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Old 04-24-2013, 12:48 PM   #9
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Nooo, I'm not going 8k between changes. I did my first one at 5k. Said my next one will be @ 8k (so 3k between the first and upcoming change)
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Old 04-24-2013, 12:55 PM   #10
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Nooo, I'm not going 8k between changes. I did my first one at 5k. Said my next one will be @ 8k (so 3k between the first and upcoming change)
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Old 04-24-2013, 12:57 PM   #11
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I have no insight or help whatsoever... all i can say is good luck. It's the worst when you think something might be wrong.
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Old 04-24-2013, 01:10 PM   #12
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I have no insight or help whatsoever... all i can say is good luck. It's the worst when you think something might be wrong.

Agreed. The second I heard the sound for the first time my heart sank and I just said to myself "What the s**t is that sound!?".

But I sent the video to the original dealer I bought the car from and they said it doesn't sound like a lifter and that it's *possibly* an exhaust leak. Between that, and everyone hear saying it sounds normal, I feel comfortable thinking that there is nothing major mechanically wrong with it. It's likely too much oil put in it, and in the worst case it's an exhaust leak.

I had just started toying with the idea of doing headers and a tune but this small scare has me doubting wanting to lose my warranty now though.
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Old 04-24-2013, 01:19 PM   #13
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Quote:
Originally Posted by nyrfan View Post
I've read this about the oil and find it somewhat true. I used 7.5 qt's last oil change and the engine is much quieter.
I've also heard that Pennzoil Platinum also helps to quiet the lifters; I will be switching to this on my next oil change.

But who uses 9, the car calls for 8qt's?
i couldnt remember off the top of my head. what it was thats why i said 8 or 9

but on a completely drained engine 8.5 to 9 is what it will hold.
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Old 04-24-2013, 01:20 PM   #14
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i couldnt remember off the top of my head. what it was thats why i said 8 or 9
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Old 04-24-2013, 01:27 PM   #15
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ha, my same thoughts.. I have been looking at LT headers and this just scared the sh#$ out of me.

I had just started toying with the idea of doing headers and a tune but this small scare has me doubting wanting to lose my warranty now though.[/QUOTE]
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Old 05-06-2013, 09:36 PM   #16
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ha, my same thoughts.. I have been looking at LT headers and this just scared the sh#$ out of me.

I had just started toying with the idea of doing headers and a tune but this small scare has me doubting wanting to lose my warranty now though.
[/QUOTE]
Warranty Smarranty!!! You know if you have a keeper after 5K. Just sayn Do It!
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Old 05-06-2013, 09:44 PM   #17
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Warranty Smarranty!!! You know if you have a keeper after 5K. Just sayn Do It!
That's just silly.

OP... your car sounds 100% normal. You want real weird? Sit in your car once it's warm and watch the tach. There is easily a 300 RPM bounce just sitting there. Love your car and treat her right. Good job so far.
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Old 05-09-2013, 09:56 PM   #18
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to me it sounds like your injectors firing normal. Sometimes they are a little loud and sound like tapping.

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Old 05-10-2013, 02:37 PM   #19
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Tapping sound

On sale now 5-10-13 Pennzoil platinum 5W/30 8 quarts with K&M filter $60 at Advance Auto Parts!!
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Old 05-10-2013, 02:45 PM   #20
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Tapp noise

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That's just silly.

OP... your car sounds 100% normal. You want real weird? Sit in your car once it's warm and watch the tach. There is easily a 300 RPM bounce just sitting there. Love your car and treat her right. Good job so far.
I think that if you install a real tach like I did you will see the rpms jumping more, but I have a cam and it is what it is----
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Old 05-10-2013, 03:03 PM   #21
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I think that if you install a real tach like I did you will see the rpms jumping more, but I have a cam and it is what it is----
I have datalogged it since then and it bounces between 490 - 600+
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Old 05-10-2013, 03:06 PM   #22
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sounds normal to me
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Old 05-10-2013, 04:03 PM   #23
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The injectors make noise...sure its not that your hearing? If you were close enough I would say drive in and we would listen for you.
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