trouble shooting help or ideas???

[AimCOtaco]

Whats the TSB on the booming say? Is it just acknowledged or is it solved?

 

[elkaholic]

I know there is a thread on Mud that contains it, but the TSB is a fix. I think the TSB runs several pages with fairly detailed instructions.

Remember that funky weight you took off the frame? That was part of the fix. Basically, the fix is to add weight at strategic points to change the natural frequency of various pieces that vibrate.

Natural frequency is a part of what brought down the Tacoma Narrows Bridge ... in our case, it is not catastrophic, but more of an annoyance that the NVH engineers try to fix.

I took the dampener off the frame of my '06 in order to add the sliders and I cannot tell a difference ...

 

[petrotk40]

mine was the same before and after I removed the doohicky

 

[Brock]

I like hearing/feeling that rumble!

that is what she said! Perv!

 

[Mxndrnks]

my 4runner has a spring loaded adjuster on the a/c idle up valve that lets you adjust the idle speed when the compressor engages. maybe the 100 has a similar feature. i actually tapped into the switch(on the runner) to engage the idle up when my arb air compressor turns on to increase the rpms when filling tires. i recently added my winch to the mix as well.

back on subject why don't you reinstall the "flux capacitor" to see if the noise is still there? is it not possible with the sliders installed? I know there has been talk of this before but there has to be a reason that part is on the truck. toyota obviously added that after the truck was designed and built because they found some sort of harmonic problem with it. that thing is a band aid for something.

someone should also remove their sliders altogether and drive around a while to see if there is any difference. i noticed in the original post this started right after rear bumper and sliders installed. all of these heavy accesories could cause some sort of harmonic imbalance. plastic and foam(stock bumpers) absorb noises/vibrations, metal could amplify it. Does everyone that is having this problem have aftermarket bumpers and/or sliders?

I'll look into the spring loaded adjuster. As far as reinstalling the "flux capacitor", it is a no go with the sliders and skids. As I noted before it started after towing. At first it was a rotational grind. I was convinced it was the torque converter at first. But a couple of mechanics say the TC and trans are running perfect. The grind went away for a until just last week and now it is back and definitely at the front end with the AC on. After it started, I rebuilt the entire underside and took everything but the front and rear bumper off and had no luck with the rumble. It is ok though. I can live with the rumble... it s only audible on the inside and most dont even notice it. It is the current grind that has me most concerned. A bearing somewhere on the front is going...

There was a TSB on the booming....mine does it a little at idle in D but I also have it between 1800-2000 rpms when driving and then disappears....figure it is just harmonics as I have replaced both front axles...new gears in front and rear diffs....etc.

I am going to replace my exhaust from CAT back and put new pipe and a Magnaflow muffler this year and change the bends in pipe for more clearance especially towards rear where spare used to be....but hoping that fixes it.

Only other rumble i have is slowing for lights when I get around 5mph or before complete stop I can hear and feel every single cleat in my tire tread pattern. LOL

Whats the TSB on the booming say? Is it just acknowledged or is it solved?

I know there is a thread on Mud that contains it, but the TSB is a fix. I think the TSB runs several pages with fairly detailed instructions.

Remember that funky weight you took off the frame? That was part of the fix. Basically, the fix is to add weight at strategic points to change the natural frequency of various pieces that vibrate.

Natural frequency is a part of what brought down the Tacoma Narrows Bridge ... in our case, it is not catastrophic, but more of an annoyance that the NVH engineers try to fix.

I took the dampener off the frame of my '06 in order to add the sliders and I cannot tell a difference ...

The TSB if we are all thinking of the same thing was for exhaust boom. along the dial up modem attached to the frame, there were weights added on the inside of the frame at the back near the exhaust.