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eroberts85

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Discussion starter · #1 ·
2012 Nissan Murano S AWD. Transmission went out at ~110k in 2023. Unsurprising/expected given the V6, AWD, CVT, and mileage.

We paid a local transmission shop to put in a brand new unit (direct from the nissan dealer).

~3k miles after this it started to 'slip'. I'm not sure that's the right term since it's a CVT and they don't slip in the traditional sense, but occasionally when starting from a stop (like at a stoplight), it would accelerate really, really slowly, and then would seem to 'catch' and take off and would behave normally.

We took it back, the shop took it to nissan, the transmission was deemed faulty and it was replaced with another brand-new unit.

The warranty on the transmission was 12 months and 12,000 miles.

It's now been ~15 months and 10k miles, and it's starting to do the exact same thing (occasional, intermittent incredibly slow acceleration from a stop). 95% of the time it's fine, but once every 1-3 days it'll do the above at a stoplight.

No check engine light, no warning lights.

Is there anything that could cause this other than (another) faulty transmission? I'm not interested in shelling out another $6k to maybe fix this, so if that's what it will take I'm just going to dump it as a mechanic's special.

Is it worth taking it somewhere else to have a second opinion? What should I ask them to do/check?
 
A second opinion doesn't hurt, but among other things you could do a complete fluid replacement.

One thing I wondered when you said that an indy transmission shop had done the work is: did they use the correct Nissan fluid in the transmission? The CVTs are particular and an error in that fluid could account for both failures.

Others may have other suggestions, but I'd incline to changing vehicles.
 
occasionally when starting from a stop (like at a stoplight), it would accelerate really, really slowly, and then would seem to 'catch' and take off and would behave normally.
intermittent incredibly slow acceleration from a stop). 95% of the time it's fine, but once every 1-3 days it'll do the above at a stoplight.
This sounds more consistent with a vacuum leak. Have you (or your mechanics) carefully inspected the rubber intake tubing going from the air filter box to the throttle body? It's best to remove it as sometimes large cracks in the accordion folds can be difficult to find otherwise.
 
I'm not sure, and can/will do this, but wouldn't such a large vacuum leak trigger a check engine light? And likely be evident at times other than occasionally starting from a dead stop?
A vacuum leak can cause considerable driveability issues and yet not be bad enough to set a DTC. The hesitation tends to happen at low engine speeds and hence is usually most noticeable from a stop because the engine is at idle and must also overcome inertia to get the car going. What happens is a bunch of unmetered air enters the engine causing a lean condition and the engine hesitates, but then the ECM dumps extra fuel into the engine to compensate and then the car goes.

If you search these forums, you'll find countless posts of people that suspected a transmission problem and it turned out to be a hole in the intake tube. This is not to say you don't have a transmission problem, but the symptom you described is frequently the result of a simple vacuum leak (most common being a crack in the intake tubing).
 
Discussion starter · #6 ·
A vacuum leak can cause considerable driveability issues and yet not be bad enough to set a DTC. The hesitation tends to happen at low engine speeds and hence is usually most noticeable from a stop because the engine is at idle and must also overcome inertia to get the car going. What happens is a bunch of unmetered air enters the engine causing a lean condition and the engine hesitates, but then the ECM dumps extra fuel into the engine to compensate and then the car goes.

If you search these forums, you'll find countless posts of people that suspected a transmission problem and it turned out to be a hole in the intake tube. This is not to say you don't have a transmission problem, but the symptom you described is frequently the result of a simple vacuum leak (most common being a crack in the intake tubing).
Thank you for taking the time to write that out and explain.

I'll pull it off the intake tubing tomorrow and inspect. If there isn't an obvious hole or crack, I'll take it to our mechanic and have him smoke test the whole thing.

Fingers crossed that does it.
 
2012 Nissan Murano S AWD. Transmission went out at ~110k in 2023. Unsurprising/expected given the V6, AWD, CVT, and mileage.

We paid a local transmission shop to put in a brand new unit (direct from the nissan dealer).

~3k miles after this it started to 'slip'. I'm not sure that's the right term since it's a CVT and they don't slip in the traditional sense, but occasionally when starting from a stop (like at a stoplight), it would accelerate really, really slowly, and then would seem to 'catch' and take off and would behave normally.

We took it back, the shop took it to nissan, the transmission was deemed faulty and it was replaced with another brand-new unit.

The warranty on the transmission was 12 months and 12,000 miles.

It's now been ~15 months and 10k miles, and it's starting to do the exact same thing (occasional, intermittent incredibly slow acceleration from a stop). 95% of the time it's fine, but once every 1-3 days it'll do the above at a stoplight.

No check engine light, no warning lights.

Is there anything that could cause this other than (another) faulty transmission? I'm not interested in shelling out another $6k to maybe fix this, so if that's what it will take I'm just going to dump it as a mechanic's special.

Is it worth taking it somewhere else to have a second opinion? What should I ask them to do/check?
I wonder if it's computer-related or something needs reprogamming of sorts? A 2nd opinion for sure would help but hopefully someone in the forum with a better answer!
 
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