Resonance Sound

[jGiacobbe]

I've had my first CTD for about a month now. It's making a sound that I am not familiar with. It's a resonating sound, kind of like when you run a wet finger around the edge of a glass. It's not the turbo whirling sound. It does not appear to be RPM specific and will happen in all gears. It only lasts about 2 seconds in each gear. It almost seems like it happens when the truck is working a certain amount. For example, it won't make the noise w/ almost no throttle, or full throttle, but somewhere in between.



If anyone knows what it is, is there any way to get rid of it & do I need to be concerned. I'm headed on a long trip Wednesday & don't need to have any problems.

 

[Batman]

Does this sound happen right at 2000 rpm?

If so, a friend of mine (HEYBOSS) used my K&N in the stock box to see if this would correct the problem, and it seemed too.

HTH

 

[jGiacobbe]

I think it seems to happen most often around 2100 rpm's. Air filter... I wouldn't think that's it, but I can give it a try.

 

[dodger22]

Do a search on "resonance". There was a thread a while back Aug/Sept I think where this was addressed. If I recall the cause of it is normal engine pulsation through the drive train.

 

[Steve M]

It's called a wine glass chirp. It's the turbo resonating through the exhaust. Ain't it beautiful! Almost like the song of the whales...

 

[jGiacobbe]

Steve M,



That's exactly what it sounds like. So basically, everything is fine & don't worry about it... right?



Thanks.

 

[JES]

Look Here

If you will just pull the muffler and resonator off then you'll be able to really enjoy it. I do.