Originally Posted by
Ddmrcsen22
I have not had a very good look at the engine or trans yet besides checking fluids, it was hit from the passenger side front and it completely crushed the frame on that side, from the looks of it the trans should be fine but I will be checking it out on the weekend, will know for sure then. From your experience is the valve body typically what goes wrong? I have been having surging, slipping, bucking for around 80k but now its starting to get dangerous, most recently it has been accompanied by a screech like noise sounding very much like a belt. No blinking D yet but almost positive it going to start soon.
Changing the valve body won't fix every cvt issue but can fix some. Most of the failures I've seen were a thrust washer failure, as seen in the second teardown vijeo. Those ones were screwed. The fluid turned black almost imediately after replacing it, the engine would want to stall when stopped and in drive. The only way to know if that's your problem is to drop the oil pan and look for pieces of the bearing.
I have had one cvt act up at around 186000miles. It wouldn't rev up, and was throwing cvt codes(flashing shift indicator). I replaced the valve body with a used one(after removing pieces of piled up bearing from it) and it's now got the same mileage as yours.
Someone commented in one of the cvt teardown vijeo's that they replaced a valve body for a customers cvt with high mileage that was surging and it fixed it. The one in my own car was surging fairly often, I was replacing the engine anyways(spun rod bearing) and picked up a basically new cvt and threw it in. After tearing the old one apart I'm pretty sure I could have just thrown a valve body at it and been good for another 100k miles. But I didn't want it to crap out a month down the road so I just replaced it.
I don't know what I'd do, maybe just replace both at the same time if you don't want to waste time experimenting.
Originally Posted by
Ares
Not a mechanic but one would assume just swapping the tranny would be less work - especially if your engine is fine. I'd definitely keep the parts car for later use, though
Yes and no. Mirage transmissions aren't hard to replace with a hoist but it'd be a bit of a pita to do with the car up on jack stands. The hardest part would be trying to wrestle it in and out of place unless you have a decent adjustable transmission jack that pivots. It's easier with the subframe removed but then you have to get the rack an pinion lined back up to the steering column because the shaft isn't keyed. And...you have to support the engine with the transmission removed.
There is more stuff to remove when pulling the engine with the transmission but it's easier to bolt them together when they're not in the car.
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View my fuel log 2014 Mirage SE wussie cvt edition. 1.2 automatic: 37.7 mpg (US) ... 16.0 km/L ... 6.2 L/100 km ... 45.3 mpg (Imp)