Scary LT4 sound...
#1
Scary LT4 sound...
Hi guys
my engine sounds normal but when recorded with my phone mic, the LT4 sounds terrible when getting close to the SC, like if ball bearings were about to explode!
Car only has 7500 miles...
my engine sounds normal but when recorded with my phone mic, the LT4 sounds terrible when getting close to the SC, like if ball bearings were about to explode!
Car only has 7500 miles...
Last edited by Fastmikefree; 04-23-2018 at 12:57 PM.
#2
Hi guys
my engine sounds normal but when recorded with my phone mic, the LT4 sounds terrible when getting close to the SC, like if ball bearings were about to explode!
Car only has 7500 miles...
https://youtu.be/eibFLiaZNOM
my engine sounds normal but when recorded with my phone mic, the LT4 sounds terrible when getting close to the SC, like if ball bearings were about to explode!
Car only has 7500 miles...
https://youtu.be/eibFLiaZNOM
Take it to the dealer and have them fix it. The car is still under warranty unless you've cracked the ecu and put a tune in it.
Last edited by Hershey71; 05-21-2018 at 08:20 PM.
#3
Le Mans Master
Hi guys
my engine sounds normal but when recorded with my phone mic, the LT4 sounds terrible when getting close to the SC, like if ball bearings were about to explode!
Car only has 7500 miles...
https://youtu.be/eibFLiaZNOM
my engine sounds normal but when recorded with my phone mic, the LT4 sounds terrible when getting close to the SC, like if ball bearings were about to explode!
Car only has 7500 miles...
https://youtu.be/eibFLiaZNOM
#4
Former Vendor
I haven't heard of a ton of issues with the LT4 (not like the LSA anyway) but there have been some cases were the supercharger needed to be swapped out. Bring it in to the dealer. If the blower has an issue they should change it even if you are tuned. The only mod they could claim hurt the blower would be a pulley. A tune wouldn't spin it harder or affect the blower in anyway.
#5
Sounds like the sc bearing is going bad. Its usually the pulley bearings. I’ve heard of this issue from a few, not many. Let us know what you find.
Last edited by Cercone; 05-22-2018 at 01:52 PM.
#6
Tech Contributor
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Mine is doing the same thing.
Bill
Bill
#7
Thanks guys! Appreciated!
I contacted the dealer and got an appointment for after vacation period in September. He confirmed that SC will be replaced under warranty if problem is confirmed. But after comparing against three other Z06, this one definitely has an issue... probably bearing going bad, I agree.
I contacted the dealer and got an appointment for after vacation period in September. He confirmed that SC will be replaced under warranty if problem is confirmed. But after comparing against three other Z06, this one definitely has an issue... probably bearing going bad, I agree.
#8
Advanced
Thanks guys! Appreciated!
I contacted the dealer and got an appointment for after vacation period in September. He confirmed that SC will be replaced under warranty if problem is confirmed. But after comparing against three other Z06, this one definitely has an issue... probably bearing going bad, I agree.
I contacted the dealer and got an appointment for after vacation period in September. He confirmed that SC will be replaced under warranty if problem is confirmed. But after comparing against three other Z06, this one definitely has an issue... probably bearing going bad, I agree.
#9
Burning Brakes
Thanks guys! Appreciated!
I contacted the dealer and got an appointment for after vacation period in September. He confirmed that SC will be replaced under warranty if problem is confirmed. But after comparing against three other Z06, this one definitely has an issue... probably bearing going bad, I agree.
I contacted the dealer and got an appointment for after vacation period in September. He confirmed that SC will be replaced under warranty if problem is confirmed. But after comparing against three other Z06, this one definitely has an issue... probably bearing going bad, I agree.
#10
Also he did confirm that there is no emergency and worse will happen inside SC without any risk for the engine and that I could easily wait till after vacation period.
Clear as mud? Not too sure with my poor english level...
Last edited by Fastmikefree; 05-24-2018 at 05:45 AM.
#11
Burning Brakes
Alright, I had no idea that the nearest dealer to you was 150 miles away but unusual engine sounds isn’t something you want to ignore for a few months. I don’t think I would take that chance not knowing what the problem actually is. I hope you’re able to enjoy your car until then.
#12
Le Mans Master
Member Since: Oct 2005
Location: Metro Detroit Michigan
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Mikec7z (08-24-2018)
#13
Le Mans Master
I would get it checked but I honestly wouldn't worry too much. Here's a little video of my big old 427 with iron manifolds. In person it's deep and rumbly and powerful sounding.
On the phone almost ALL you can hear are the fuel injectors! So the phones tend to really emphasize sounds in a particular frequency range.
On the phone almost ALL you can hear are the fuel injectors! So the phones tend to really emphasize sounds in a particular frequency range.
#14
#15
I would get it checked but I honestly wouldn't worry too much. Here's a little video of my big old 427 with iron manifolds. In person it's deep and rumbly and powerful sounding.
On the phone almost ALL you can hear are the fuel injectors! So the phones tend to really emphasize sounds in a particular frequency range.
On the phone almost ALL you can hear are the fuel injectors! So the phones tend to really emphasize sounds in a particular frequency range.
#16
Tech Contributor
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I have the same bad bearing sound in my SC. It seems worse when the engine is hot. I talked to the dealership Service Writer about it yesterday. He said they have replaced the SC on several CTS Vs due to a similar rattle.
Bill
Bill
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#17
Phil
#18
Melting Slicks
I would be concerned about metal getting in the cylinders.
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Mikec7z (08-24-2018)
#19
#20
Melting Slicks
My other car has the LSA and the bearings are pressed in from the rotor side. So when they go it could get metal in the engine. I drove it for a while with them screeching at cold start. They also made noise when it got hot from a hard mountain run. I started to get nervous about it so parked the car and bought a vette. LOL. Eventually took it to the dealer and they wouldn't fix it. Couldn't duplicate noise. Eventually took it to second dealer and they had no problem getting a new SC installed. I assume the bearings could get loose and let the rotors make contact for another source of metal bits.
Last edited by djnice; 05-27-2018 at 03:00 PM.
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Mikec7z (08-24-2018)