Badlilhemi
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- Oct 30, 2023
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- 46
LOL.. I am here too trying to figure this out... the EcoDiesel guys get this also and some have used deadner or silicone on floor area near throttle pedal and one wrapped a heater hose around his steering shaft to dampen the harmonic... It's annoying as hell... there are lots of posts all over... only one guy claims to have resolved it with the silicone on the floor below pedal method and hose on steering shaft.. I think he probably split the hose long ways wrapped it around and tie strapped it back is my guess... issue is none of these people are sending pics.. I fought a harmonic in my 2004 hemi that would rattle my dash at idle.. I figured out where it came from and had a braket welded from driver side exhaust to top of trans mount to give it a place to end... resolved 90% of the issue.. loved that truck after that... I hope I can figure this one out.I'm gonna resurrect an old thread here. I feel like I've been having the same issue on my 20 RAM 5.7 Hemi, non-etorque pretty much since new. I had it at the dealer at 6500 miles and they "couldn't reproduce it" Well I'm getting close to 60k miles now, noise is still present, but pretty much unchanged since it was new.
I agree it's not a simple "vibration" as it's a much higher frequency then tires out of balance, very similar to a cell phone buzzing. However, it occured to me that it's identical to the drone/buzz/vibration you will feel if you are driving a manual and accidently put it in a gear too low and then try to accelerate. So it's almost like the transmission shift points are just slightly off. Seems like could be fixed with a software update, but just conjecture on my part.
So anyone figure out a fix?
I keep seeing people say when its COLD or early in the morning its worse.... Motor mounts are rubber.. they are stiffer in the cold and will feed more harmonics until worked around from engine torque and then the heat from the motor feeding into the rubber likely loosens it up some.. this is theory.. This feels like engine or exhaust vibrations feeding through... NOT a tire issue.. it doesn't follow speed.. it follows RPM. 1500-2000 seems to be the harmonic range.. Lots of guys are just dealing with it.
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