The truck is back now with a fresh CV. Unfortunately, while the clicking noise is gone I'm still getting a popping noise that deserves attention. Toyota offered to keep looking into it but I elected to take the truck back and investigate further on my own.
Lo and behold, a couple miles after leaving the dealer I got a brand new noise.... ugh.
It definitely sounds like something in the hub area wasn't re-assembled correctly (read further below for a recording). I'm going to check out the dust shield, calipers, and brake pads as soon as I can. Heck, maybe even the brake lines or sensors? This is definitely getting frustrating. We were planning on some camping this weekend but now that's not happening.
Let's review the timeline for the past few months. Prior to Cruise Moab the truck had zero known issues.
May
- Cruise Moab: Fins, Dome Plateau, ToTW, Chicken Corners
- Hydrolocked engine plus rod thrown through oil pan
- Truck lived at Glenwood Springs Toyota for all of May
June
- Picked up the truck in early June from Glenwood. No issues aside from a wicked pull to the right.
- Had the undercarriage steam-cleaned to take care of the Moab mud.
- Alignment at a local specialty shop... results were "okay" but was still getting a pull to the right.
- Picked up the XV3 trailer and moved a fair amount of weight to the trailer.
- Still no major issues at this point aside from the pull to the right. No driveline, suspension, or brake noises.
July
- Snorkel install and pretty standard round of maintenance at Valley Hybrids (front, rear, and t-case service, grease drive shafts, adjust parking brake)
- 55k service at Toyota including a full alignment, replacement of the UCAs, and investigation into a couple noises. The SPC UCA bushings and boots were worn out which resulted in excess play and the beginning of some noticeable noise. I verified and heard the noise before replacing. I couldn't get replacement SPCs (or rebuild kits) in time so I took the opportunity to try out Jason's UCAs which would be available the next day. Toyota completed the install and the new alignment was really dialed-in.
- The truck felt great after picking it up. I did notice the whistling/chirping noise a day or two later but wasn't too surprised since they said they couldn't reproduce that.
- We did the 1500 mile drive to Ouray with no issues. The first time we were on a trail with the center diff locked, though, we heard the clicking/popping noise at mid-turn that prompted the most recent round of work with Toyota upon our return.
August
- We didn't notice any performance issues with the truck in Ouray despite the clicking/popping noise. I also don't recall hearing the whistling noise while we were in Colorado.
- The truck has been in and out of the dealer since our return from Ouray. At this point we have a new CV but that part replacement didn't seem to correct whatever the underlying culprit is.
Now, we have 3 noises:
Whistling/Chirping: The whistling/chirping noise that we've had for a while. The dust shields, calipers, and brake pads have been inspected three times but now I guess I'll take another look now that we have the new metallic groan.
Metallic Groaning: This is the brand new one.
Front-End Popping: I'll update with a video of this one in a bit. It sounds quite a bit like a tire rubbing on components but that's definitely not happening because we've been able to hear the noise while observing the tire rotate freely. It's worth noting that the noise is much more pronounced once the truck is warmed up.
Perhaps all of these noises are related. Perhaps none of them are. Perhaps two of them are and the other is completely separate? I'm expecting to find something obvious regarding the new metallic groaning and will focus the debugging on the concerning frontend noise.
Thoughts on potential causes:
- Botched CV Axle Install => I really, really doubt Toyota messed up an axle swap that was done under warranty. We all thought the CV replacement would completely address the issue and from what I could observe have no concerns here.
- Wheel Bearings => seems unlikely, but I'm going to inspect what I can as part of looking at the dust shields, brakes, calipers again
- U-Joints => Again, seems unlikely since they've been inspected a couple times, but I'll take a closer look.
- Front Diff => The problem may be here. Perhaps the damaged CV damaged the diff? Maybe the diff caused the problem to begin with? I'll see what I learn by removing the front propeller shaft.
- UCAs / Suspension => It would be pretty strange for the problem to be here as the problem only arises with the transfer case locked. That said, I'm going to do some more careful parking lot testing with the center diff open to see if I can pick up any noises at all.
- Transfer Case => Let's see what's up with the front diff first.
Anything else worth looking into?