help identifying noise coming from engine
help identifying noise coming from engine I have a 2001 SS that has a noise I can't identify coming from the engine bay. I've uploaded a couple videos but the sound is kind of a chirp/knock, though it's harder to hear the chirp part of the sound in the videos. it doesn't really sound like a pulley to me, and when I Rev the engine slightly the noise doesn't really increase with it.
it's louder than the typical injector chatter.
thoughts?
it's louder than the typical injector chatter.
thoughts?
you think? most lifter issues I've heard (granted not that many) are more of a tapping sound, where this is almost a squeak.
didn't really plan to open the valve covers until I did a turbo build in a year or two.
didn't really plan to open the valve covers until I did a turbo build in a year or two.
Gotcha. Guess I won't be driving it for a while if that's the case. :/
I'll take the serpentine belt off tomorrow and see if that makes a difference. doubt it will, doesn't really sound like it's coming from the front but it's hard to really pinpoint an area at all.
I did search ls1tech for "chirping" and as you said, some of the threads were lifters. we shall see.
I also have some exhaust leaks I need to deal with so I suppose that could be a source as well.
I'll take the serpentine belt off tomorrow and see if that makes a difference. doubt it will, doesn't really sound like it's coming from the front but it's hard to really pinpoint an area at all.
I did search ls1tech for "chirping" and as you said, some of the threads were lifters. we shall see.
I also have some exhaust leaks I need to deal with so I suppose that could be a source as well.
Last edited by evo462; Oct 4, 2016 at 10:15 PM.
Well I removed both accessory belts and it still makes the same noise. Haven't had a chance to check header bolts etc to see if there's an exhaust leak.
Here's another video with a slight engine rev. It appears the noise increases tempo with rise in RPM's.
Here's another video with a slight engine rev. It appears the noise increases tempo with rise in RPM's.
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That doesn't sound good, I would not run it anymore . Start tearing it down, check lifters-cam area 1st then if it checks out ok pull the block and check bottom end. Sounds like a bearing in the bottom end to me. You could try the old tried and true method of shorting each spark plug out and see if the noise changes. If it does its a piston-bearing problem in that cylinder. Good Luck
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I'm personally leaning towards what Russ K referred to. My 00 z28 piston slapped like a ............ Ate a ton of oil and just kept going. Sold it to a good buddy of mine. He's still driving it. Just drove it from Illinois to DC, still his daily even lol.
Not saying it's for sure piston slap, not saying yours will last for years like mine has. But on cold start it was horrendous. Pretty much completely went away after it was driven for a couple minutes and brought to temp. I ran VR1 20w-50 in that car, and it drank it haha.
The car had a big nitrous cam, longtubes true duals no cats turned down under the seat. Yea, it was damn loud. You could still hear it slap real hard in the morning. I hit 6800prms in that car at least every time I drove it lol. It still runs, but I honestly don't know how lol.
-Russ
yeah, I think so. I wasn't sure if that was due to the RPM's just buying higher for the first few minutes. I need to let it run for a while or go drive it around or something. all these videos are taken within 5 minutes of the car starting cold. pretty sure the noise is still always there to a degree though.
Last edited by evo462; Oct 7, 2016 at 02:02 PM.
That last video almost sounded like it was a loose torque converter/flywheel bolt. Have you checked to see if any are loose? I had one that sounded a lot like that and I thought it was inside the motor.
If it isn't that, then I would drain the oil and cut the filter to see what it looks like.
If it isn't that, then I would drain the oil and cut the filter to see what it looks like.
I just changed the oil recently and have maybe driven it a hundred miles since (cars new to me) so unfortunately that probably won't show much right now.
I listened to some videos on YouTube of loose torque converter and to me this doesn't sound like those. it does kind of sound like the piston slap videos I listened to earlier today after it was suggested as a possibility.
I listened to some videos on YouTube of loose torque converter and to me this doesn't sound like those. it does kind of sound like the piston slap videos I listened to earlier today after it was suggested as a possibility.
It may have been the speakers I was using to watch it.
Was it making the noise before the oil change? If not, then you can drain it now and check. If it was, then I'd start with pulling the valve covers like others mentioned.
Was it making the noise before the oil change? If not, then you can drain it now and check. If it was, then I'd start with pulling the valve covers like others mentioned.
My 99 SS makes the exact same noise. Although its worse when cold and barely noticeable hot. I am assuming piston slap and heres why. I swore it was a lifter. So I pulled the heads and everyone of them looked fine. Installed new lifters since it was apart. When I got it back together it made the exact same noise. Not any better or worse. FWIW my car has 61xxx and oil pressure is always great. I also drained the oil and cut the filter. Found nothing. The camshaft looked fine from what I could tell in the motor but didn't pull it. I drive it everyday during the summer if its not raining and it hasn't had a hiccup yet.
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I would also think that noise is from the bottom end. One thing I noticed was the speed of the noise. I believe it to be of about half the idle rpm speed. The frequency of say one cylinder on a power stroke maybe.
About 6 per second. Times 60=360 per minute. 360 times 2=720rpm. Just a thought.
About 6 per second. Times 60=360 per minute. 360 times 2=720rpm. Just a thought.