That sounds like engine braking - do the engine revs go up at the same time as the jerk?crayzitalian3 wrote:no rattling (yet?) but i know that when i let go of the gas and my car starts to slow down towards the mid to low twenties, it does a strong sudden jerk as if i just shifted into 1st. what the hell is that lol
i would bring it to nissan but my warranty is done.
This thread is scaring the Sh*t out of me... My car does the same thing as crayzitalian3 and I just hit over 30K miles which puts me out of warranty I think!1125Altima3.5 wrote:
That sounds like engine braking - do the engine revs go up at the same time as the jerk?
It could be normal or you could be getting belt/chain slippage in the CVT, which is definitely not normal. I would take it in if you can reproduce the problem regularly (and make the tech ride with you while you produce it so you can document the problem.)
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THANKS FOR ALL THE RESPONSES!
Keep em coming please. Even if you have no sounds, please post a response so we can get an idea of how common the problem is. Once we get a few more poll responses I think we should try to get details on the cars with the problem (basic stuff like mileage, repair attempts, etc)
Thanks for the well wishes, but I already had the tranny replaced once and it took all of 3 weeks/1000 miles for the noise to come back. The dealer did indeed verify that the noise is there, but they obviously didn't want to do another replacement because they started spouting some nonsense about my underdrive pulley being related to the transmission noise.kerrton wrote:1125Altima, have you taken your car to the dealer regarding the CVT rattling noise?
I would guess it has something to do with sustained high torque put through the CVT in the problem Nissan applications. For the Rogue/Murano, the extra weight means you have to be on the gas harder/longer to get going. For the Altima, people just tend to drive more aggressively with the V6. Not sure about the Jeeps - maybe their TCMs are programmed to accelerate more gently?kerrton wrote:It is a mystery though, because the majority of owners have no troubles, or perhaps haven't noticed any noises yet. I've checked the Versa and Sentra forums relating to CVT, and no reports of problems at all, zero. And the Patriot and Compass have the exact CVT model and although they have LOTS of problems, none relating to the CVT that I can find.
How has the CVT been updated? The CVT that works great on one platform may be overloaded and prone to failure on another.philipa_240sx wrote:Hello, - The Murano CVT (at least the '03's) was a sore point. There were also issues with the AWD transfer case. This was fixed in later models. The Altima and Rogue CVT's are at least a 2nd generation, there is no comparison to the early Murano.
Finally, did you know Nissan surpassed 1 million CVT units sold worldwide by April 2008? I am sure the number has gone up since then.
It's definitely not normal...Jose3.5 wrote:Ive got rattle but I always thought that was normal.
This link may or may not work, but it describes the features of the Xtronic CVT's.1125Altima3.5 wrote:
How has the CVT been updated?
You know, I think the "more compact oil pump" and "lower hydraulic pressure" may have something to do with this sound. I'm only hearing this noise when the engine/tranny are cold, which leads me to believe that an oil pressure/flow deficit is related to the problem.philipa_240sx wrote:- Wider gear range/ratio- More compact chain driven oil pump (as opposed to gear driven)- Enhanced CVT control programming: - Lower lockup speed for the torque converter. - Improved precision of the pulley control system allowing for lower hydraulic pressures. - 30% increase in shift speed/response - Enhanced engine braking - Engine speed rises linearly with speed (to a point) for a more 'natural' response.
The dealer isolated the sound to the transmission bell housing, which indicates that the chatter is in the torque converter. The auxiliary gearset in the next gen Nissan CVT might help address the problem. Who knows though.kerrton wrote:(this problem is supposed fixed with the 2009 model year, slight re-design of the CVT as reported by many Nissan dealers including mine who replaced my defective CVT with a "new, redesigned countermeasure CVT now standard on all 2009+ Rogues").
Let us know what kind of trouble they give you for your mods. Given that your friend is the tech you should be ok, but I've been given a lot of BS about completely unrelated mods causing the transmission rattle (loose exhaust hanger, loose intake, underdrive pulley).LongBeachCoupe wrote:I may have a CVT issue... bringing it in on tue... i told my tech (personal friend) on the fone what I heard, and his first response was the transmission and he noted there were issues.
more details to follow...
3000 miles/month...are you a travelling salesman or something?Micron wrote:Pushing 73K miles now after 1yr, 11mo... No issues to speak of.
LOL, nope... I own a triad of tech companies, with offices in MD, WV and KY.1125Altima3.5 wrote:
3000 miles/month...are you a travelling salesman or something?
Any update on this? I bet there are a few people who are curious as to what ended up happening.LongBeachCoupe wrote:I may have a CVT issue... bringing it in on tue... i told my tech (personal friend) on the fone what I heard, and his first response was the transmission and he noted there were issues.
more details to follow...
LBC - you mentioned a couple months back that you had CVT issues and wee taking the car into the dealer. Could you give an update on what happened?LongBeachCoupe wrote:Hmmm....http://www.nissanassist.com/index.php?menu=1