Does your LS3....
#1
Melting Slicks
Thread Starter
Does your LS3....
I know LS3 motors tend to be noisy, as most LS motors are, but does your stock LS3 have the “sewing machine” light tick around 1500-2500 rpm’s? I know the Z06’s are notorious for it....and I know a lot of cam and header cars have it but I was surprised to hear it on my bone stock 2011. I really can only hear it with the windows up and radio off and it’s pretty noticeable.
I thought at first I had a loose rocker but everything checks out under the valve cover.
Just curious.
I thought at first I had a loose rocker but everything checks out under the valve cover.
Just curious.
#3
Melting Slicks
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#4
Race Director
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My previous ‘12 GS had it & it became more pronounced after I added longtubes. It was so loud that driving into my neighborhood that’s the sound you heard bouncing back off fences over the longtubes and Corsa Xtreme. I thought I had an exhaust leak it was so loud, but nope.
#5
Melting Slicks
Thread Starter
My previous ‘12 GS had it & it became more pronounced after I added longtubes. It was so loud that driving into my neighborhood that’s the sound you heard bouncing back off fences over the longtubes and Corsa Xtreme. I thought I had an exhaust leak it was so loud, but nope.
i know LS motors are noisy and really it’s just the sound of power but damn if it ain’t annoying sometimes and can make ya paranoid.
#8
Melting Slicks
Thread Starter
Since buying the car back in July I do think it has become slightly louder. Under the hood I don’t hear anything going on at idle that I would consider abnormal but the passenger side is a little bit noisier than the driver side. I popped the hood and had someone do a few revs and it sounds okay to me outside of the car but when driving at lower rpm’s with the windows up I hear a very audible ticking. Might just be LS sewing machine noise but I thought it was kinda loud to be stock
#9
Race Director
Definitely hear it in your video. Mine doesn't do it.
#11
Race Director
No ticking at all. The whole valvetrain is noisy on cold start but quiets down as soon as the oil starts to warm up a little. My 07 did exactly the same thing (and to a lesser extent, my 03), so I just chalk that up to GM's chosen components for the Corvette engine. The 5.3 in my 02 Avalanche never had the cold start valve train noise, although it started getting a little piston slap at 95k miles (75k miles of which was cammed and pullied down Magnacharged).
#12
Melting Slicks
Thread Starter
No ticking at all. The whole valvetrain is noisy on cold start but quiets down as soon as the oil starts to warm up a little. My 07 did exactly the same thing (and to a lesser extent, my 03), so I just chalk that up to GM's chosen components for the Corvette engine. The 5.3 in my 02 Avalanche never had the cold start valve train noise, although it started getting a little piston slap at 95k miles (75k miles of which was cammed and pullied down Magnacharged).
I had an 03 Z06 that ticked like hell too and drove me crazy.
#13
Race Director
What is your current car? I’ve heard a lot of cammed cars and cars with long tubes sound like mine, but I don’t know any that sound like mine that are bone stock. I’ thinking it’s noisy lifters but there’s a slight chance it’s exhaust related. I wish I could say mine had no ticking :/
I had an 03 Z06 that ticked like hell too and drove me crazy.
I had an 03 Z06 that ticked like hell too and drove me crazy.
#14
Start with a mechanics stethoscope, pin point the source. What I discovered was the fuel injectors are very loud! Through the stethoscope the lifters and valves do have that LS sewing machine sound. However the LS3 injectors are on a different level.
I still find it irritating, but the car continues to deliver. I suspect GM knew this as they put insulation on the back sides of the fuel rail covers to temper the sound. Get a scope a probe around, see if you can zero in on the source.
I still find it irritating, but the car continues to deliver. I suspect GM knew this as they put insulation on the back sides of the fuel rail covers to temper the sound. Get a scope a probe around, see if you can zero in on the source.
#15
Melting Slicks
Thread Starter
Start with a mechanics stethoscope, pin point the source. What I discovered was the fuel injectors are very loud! Through the stethoscope the lifters and valves do have that LS sewing machine sound. However the LS3 injectors are on a different level.
I still find it irritating, but the car continues to deliver. I suspect GM knew this as they put insulation on the back sides of the fuel rail covers to temper the sound. Get a scope a probe around, see if you can zero in on the source.
I still find it irritating, but the car continues to deliver. I suspect GM knew this as they put insulation on the back sides of the fuel rail covers to temper the sound. Get a scope a probe around, see if you can zero in on the source.
#16
In your video, I hear your sewing machine noise, but I will say none of my LS engines ever sounded like that.
Both of my LT engines do do to the DI.
Both of my LT engines do do to the DI.
#18
Melting Slicks
Thread Starter
#20
Melting Slicks
Thread Starter
I have the worst freaking luck with getting LS cars with noisy motors!