Possible solution for 1800-2300 rpm buzz

Like this week for example. Truck drove great over the weekend, then was bogging and sluggish and vibes were bad Mon-Wed on all trips. Today, drove as well as it ever has with minimal vibes and good power delivery. Who knows what tomorrow will bring. It's like playing roulette each time I get in the truck...

 

If it is not consistent, but seems to come and go, could it be something like an intermittent failure of the fuel pump, or an occasional bad ground wire to one of the engine components.

 

Sounds reasonable. Would be awesome if Toyota or a dealership would help me with this. But with it being intermittent I've been on multiple drive-alongs and just walk away with the "normal" comments with undertones of "you're imagining things..."

 

does it do it at certain temperatures? Like both outside temperature and cooling system temperature before it warms up?

 

Nope, no clear correlation. Coolant stays within range and temp/humidity don't seem to have an affect. You've probably seen me randomly splatter my data on various threads to see if anyone else can see any correlation I can't

A battery reset normally clears it up for awhile, but slowly degrades which I hear is quite common. I've long suspected a fuel delivery problem, but with the notice not to replace fuel pumps from Toyota to dealerships it seems they won't even LOOK at it as a potential source of failure. It squeaks like crazy most of the time though...

 

if a battery reset clears it for a while, could it be a problem with the ECM/ECU. I wonder if there is a diagnostic for that?

 

Sorry for thread hi-jack but since it seems people are watching to are knowledgable - only one day/day data point here, but it does appear the timing was generally lower yesterday vs. today... but hard to cleanly correlate b/c traffic was heavier yesterday so would expect to see lower timing with less throttle?

this morning: decent driving experience. not the best I've had, but measurably better than yesterday


Yesterday morning: sluggish, bogging, rough steering, near full throttle needed to get zooming

I always see misfires, generally early in the trip while its coming to temp, but occasionally see them while cruising at temp

 

not for me, it's right around the 2100 rpm's I get it in both feet and the wheel.

after securing the cable near the TC - @bshammer0 - it's better, not gone but better.

 

Same here - can still feel it, but it's not a big deal as it is. the biggest change for me was the numbing feeling I would get in my foot on the throttle. it's no long numbing like a vibrator on my foot which is a big plus

Steering vibes on the other hand....

 

haha, same here dude. Initially I tried some cork/rubber under the floor
mat to see if that may absorb some it but it really did nothing.

 

Can you please post a picture of your change, also you mention a solution from @splitbolt but I don't seem to be able to find it, would you have a more direct link to his solution?

Many thanks

 

Vibrations are hard. Finer harmonics are even tougher to nail down. I would think the exhaust would vibe laterally since front to back should be limited by the manifold mount point. Just a thought. Can't stretch pipe, but it can sway.

 

Drove my bro 2nd gen on a 400 mile hunting trip. Oh man I didint miss driving my 3rd gen at all. No f***king buzz/vibe. I really hate this shit!

 

Did some tinkering over the weekend - for me I get positive results when I put this further back, just a few inches from the muffler. Saw no noticeable impacts putting it in the same locale as OP but definitely makes things smoother for me at that locale.

 

Wouldn't this be engine mounts?

 

I used to think it was engine mounts but I now feel pretty convinced its exhaust vibes we feel. who knows though.. nothing is consistent enough with this truck to triangulate cause/effect in my experience

 

mounts were my initial thought when I first bought the truck, when I
had it in for them to look at it, I mentioned just that to the tech and when
he looked it over he said it could very well be just that.

has anyone tried swapping them out that you know of?

 

Has anyone else given this damper a try? My vibrations are very minimal but if I can rid them completely that would be great.

 

If they are already minimal upgrade to mid or premium gas and they'll subside even more if bet

 

FWIW, here is the thread and page OP refers to on the RX forum.
https://www.clublexus.com/forums/rx...-rx-350-excessive-noise-and-vibration-18.html