Rattle / High Pitch Noise Between 5.5k and 6.5k rpms?
04-13-14, 07:19 AM
#46
Driver
Thread Starter
I took my car (IS350) in for its 5000 mile service, and asked them to take a look at it. My service advisor mentioned that they were able to duplicate the noise, but the tech checked everything he could and found no loose heat shields or anything else. They tested an IS250 and claim to have heard "a noise like that" at a different engine speed, but chalk it up to a normal "characteristic" of the vehicle "because of the intake and exhaust system that they have." My service order says they put the car on a lift, ran the RPMs to 4000, and took a look - everything is normal.
04-13-14, 01:09 PM
#49
Driver
Thread Starter
Others need to bring their cars into the dealership so they can be looked at. Not all techs are created equal and if someone figures it out, it can be reported back here so we can have that solution applied to our cars. It's possible that bone stock, all cars have this sound but it's faint, and not everyone would hear it unless they are at light throttle with the radio off, A/C fan on low, etc.
dbs600 -- its possible this noise was present in my car when I took delivery, but it's hard for me to know for sure.
dbs600 -- its possible this noise was present in my car when I took delivery, but it's hard for me to know for sure.
04-13-14, 01:22 PM
#50
06-24-14, 04:51 PM
#52
06-26-14, 01:45 PM
#53
Driver
Thread Starter
dbs600 -- TheShaddix has a lot of experience with intakes on these cars - he's tried several of them. He's noticed the sound in his car intermittently with the Takeda and the JoeZ intake, so between his experience and my trial removal of the noisemaker I think we can safely conclude that the intake is not the root cause of the sound.
I *think* that I agree with the location of the noise (passenger side, behind/below glovebox), and if that's the case, two candidates could be either the fuel pump (noisy as hell, on passenger side of engine) or the catalytic converter / heat shields / etc.
I actually bought and installed the fuel pump sound isolator from Sewell - it's an insulated clamshell used on the LS460, which uses the same fuel pump - and it didn't make a difference. The strange thing is that I can't hear a damn thing from outside the car when you rev it up. Only in the cab.
I *think* that I agree with the location of the noise (passenger side, behind/below glovebox), and if that's the case, two candidates could be either the fuel pump (noisy as hell, on passenger side of engine) or the catalytic converter / heat shields / etc.
I actually bought and installed the fuel pump sound isolator from Sewell - it's an insulated clamshell used on the LS460, which uses the same fuel pump - and it didn't make a difference. The strange thing is that I can't hear a damn thing from outside the car when you rev it up. Only in the cab.
06-26-14, 01:51 PM
#54
One thing I wanted to note is that I only heard this noise when the RPM's were around 6k and up, never below that. With this being said, that means it's most likely some thin metal shielding (cats...) that start to resonate/vibrate above certain rpm. Another thing is, it's only on the right (pass) side. In my case the noise is rarely there, but I hope you guys figure out the issue. I'm trying to figure out my driver door rattle, now that's annoying!
10-13-14, 10:47 PM
#57
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I had brought my vehicle in for oil change and check up approximately 1 month ago and they said "diagnosing vibration noises can take anywhere from 20 mins to 4 hours, or longer, depending on what the technician needs to look for". I had all day so of course I told them to look into it for me. After multiple steady rpm tests and test drives, still nothing can be found.
Outside of the dealership during my day to day drives, I sometimes hear it when idling @ red light, anyone else experienced that?
Outside of the dealership during my day to day drives, I sometimes hear it when idling @ red light, anyone else experienced that?
10-14-14, 05:42 AM
#59
Driver
Thread Starter
I still can't pin down the source of the noise.
I have wondered about the heater core; either air being trapped in it or some other problem. As the engine speed increases, coolant flow through the core increases also. It is deep in the dashboard and might explain why it can be heard inside but not outside. Also, Sewell's website shows that the heater core has been revised for 2015 IS cars. Just a thought, who knows.
I have wondered about the heater core; either air being trapped in it or some other problem. As the engine speed increases, coolant flow through the core increases also. It is deep in the dashboard and might explain why it can be heard inside but not outside. Also, Sewell's website shows that the heater core has been revised for 2015 IS cars. Just a thought, who knows.
10-14-14, 08:20 AM
#60
