[pboglio]

Clunking noise could be many things. Mine clunked going from park to drive. This ended up being a worn out forward clutch drum spline that eventually cracked and disabled the entire transmission. At the time I didn't know this because I also had clutch pack and CVT belt slippage issues. Well, 10k miles later the transmission completely failed leaving me stranded.

Forward clutches slipping will cause the slippage your are describing of course, so will a worn CVT belt. Typically if you don't slip or shudder in reverse, then it's the forward clutches. The torque converter IMHO is doubtful, it's torque limit is much higher than the rest of the transmission.

Given your explanations I can't see the transmission lasting much longer. In almost every case that an owner reported strange CVT behavior (rpm surge, slippage, clunking, etc.), ultimately their transmissions failed catastrophically shortly afterwards. Probably not what you wanted to hear. At this point if you would look inside the transmission almost everything would be worn out or damaged to the point of not being worth repairing.

I would take it to a dealership to investigate further but certainly not drive it anywhere if possible beyond that. Consider if the vehicle is worth repairing because it will typically run between $4000-$4500 to replace with a brand new transmission fully installed.

I'd see about getting it covered under warranty if you're within the 60k mileage limit.

 

[pboglio]

My understanding is that they cannot warranty the transmission without it throwing codes first, so give it some time. The CVT belt slippage is very easy to detect on the CONSULT, same goes for the forward clutches/torque converter. If you had the CVTz50 software and a bluetooth OBDII transmitter/receiver I could review the logs and tell you what's likely going on.

 

[pboglio]

Download CVTz50 and get a OBDII bluetooth (i.e. OBDLink MX Bluetooth, OBDLink® - OBD-II Diagnostic Scan Tools for Android, iOS, & Windows | OBDLink® | OBD Solutions).

The bluetooth works pretty good. I'd set the CVTz50 to log just CVT data and not the engine data. It'll also detect CVT codes. The log file gets dumped into a .txt file on your phone.
If there is any slippage in the transmission, this will clearly show it. Order it up and if you have questions on setting it up just send me a pm and I'll walk you thru it.

 

[pboglio]

Just send them to my email at:
pboglio1 [at] yahoo [dot] com

 

[pboglio]

Justin,

The good news, at WOT or full power you are not slipping the transmission. Pulley pressures look good and clutch pressure looks good. The "slip revs" are in single digit values, which means the torque converter, forward clutches, pulley belts are not slipping. However, at about time stamp 7:31:41 you have some weird slippage at very light throttle. It's this transition from zero throttle to light throttle where you seem to be having problems.

Now what is pretty interesting is that the computer is not getting the correct "gear ratio" it's looking for, it's showing a "?" next to the commanded gear ratio and actual gear ratios. These should match almost identically. Say it's looking for 1.68 ratio, but it measures 1.85 ratio. They never match regardless of what ratio it is. This is not normal. It might explain why the car slips at light throttle. Your gear ratios are consistently 1.125 - 1.1875 times off, or 12.5% - 18.75% shorter gear ratio than the computer is commanding almost at all times.

I've only ever had this problem when I screwed up installing the valvebody and mis-positioned the gear ratio lever, I was consistently 1/2 gear off on the ratios. Not saying this is your problem, but the valvebody controls this via a mechanical linkage, piston, and solenoid on the valvebody.

So to summarize: No slippage at WOT, some slippage at zero/light throttle, gear ratios not correct. I'd guess the CVT itself is good, but a speed sensor or gear ratio control is not working correctly. Why it hasn't thrown a code, not sure. But at worst you are looking at a valvebody swap and/or speed sensor replacements.......maybe. Not the end of the world. Valvebody is $750 brand new and about as hard as changing the engine oil filter, speed sensors are tucked in there pretty good but also doable.

Can you make some runs in "Manual" mode only? This will prove definitely if the gear ratios are off, because they will be locked in whatever gear the selector is in.

 

[pboglio]

Yes, it’s Gear ratio. The columns look funny but that’s how it is. I compared against my logs in Drive mode and my ratios matchup correctly as they should. Send the manual mode logs when you can. Thanks.

 

[pboglio]

Hmm.....wonder if you have a Gen2 Juke. What year is it?

 

[pboglio]

The noise didn't sound good, but I only caught a short bit of it. I don't recognize that sound but it could be the belt.

I had a bearing noise on throttle lift off as well. When I rebuilt my CVT I found (1) sticking bearing pack that might have been the cause. This is very common when you get debri in the bearings. They hate metal debri contamination and it's not hard for them to get jammed up. Eventually they seize up and the CVT belt just snaps, this is common for the Jatco CVT transmission.

Sorry about the car but you made the right choice to stop driving it.

 

[pboglio]

That sucks. But hopefully they can fix it and cover most of it.