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  #12973  
Old 02-11-2015, 08:10 PM
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Re: 2014 Grand Cherokee information - Australia

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Originally Posted by mmcrh View Post
gear Never downshifted before The TCM flash on Mt Ousley Rd, 80kph on 8th gear uphill, rpm's up around 3000+, engine roared, drove on far right lane overtaking other cars, loved the speed back then. Now engine sounds weak compared to before, rpm's up 3000+ too, but not speed, drive on truck lane watching others overtake me. Even Mrs complaints about it.
But heres the thing you can't do 3000rpm in 8th gear at 80kph. It just isn't possible. The trans would have had to shifted back to 4th to allow revs to increase to that range. Unless something is slipping badly before the TCM update, but now isn't.

I'd love to see a video of the problem showing the speedo, revs and gear selection. Because none of your description is adding up.

And as previously suggested, try using the paddles to select a lower gear and see if it will accelerate, then as it does accelerate, choose the next gear up (as you would do in a manual). If the transmission gear selection isnt working as you want it, try selecting your own gears and see if it will allow the car to accelerate using the appropriate gear selection. Selecting 4th gear at 30kph going uphil isn't appropriate.

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  #12974  
Old 02-11-2015, 11:17 PM
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Re: 2014 Grand Cherokee information - Australia


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OK, so I tried an experiment on a hill when going out to get some lunch.

Basically I was doing the same thing as "mmrch". Having the car in the wrong gear and at the wrong part of the rev range and putting it under a load from going uphill.
This was to see what sort of "idiot proofing" is in the gearbox controls.

Started at the bottom of a moderately steep hill, put it in manual mode.

Drive up in 2nd & 3rd and tried to change to 4th just as it reached 30kph.
- Nothing happened. The gearbox stayed in 3rd and would not let me change to 4th. (The computer overrides the "idiot" i.e. me)

I tried again, this time i got it to go a bit faster and changed to 4th and then slowed it down to about 30kph still in 4th. Then i gradually put my foot down halfway to try and climb the hill.
- At first the revs dropped down a bit then the gearbox changed to 3rd gear all by itself before stalling and the car climbed the hill OK. ( Again the computer overrides the "idiot" )

I tried the same experiment again 4th slow to 30kph and try to climb on another hill, maybe not quite as steep and a bit different action on the accelerator pedal.

- This time it stayed in 4th gear but it allowed the torque converter to "slip" a bit so the engine revs went up (maybe about 2500rpm?) and the car did climb the rest of the hill in 4th. As it leveled out The "slippage" decreased as the speed of the car went up to match the engine revs which stayed about the same.
So instead of the software changing to a better gear, this time it was was torque converter allowing some mechanical change to assist.


I did not like to have the torque converter slipping that much.

I felt like if I stamped my foot down on the accelerator once it started "slipping" it would just spin the motor faster without getting the drive to the wheels. I would never to that as it probably is not good for the the car.

I believe in mechanical sympathy, which is why i don't have a reputation for breaking things
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  #12975  
Old 02-12-2015, 12:28 AM
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Re: 2014 Grand Cherokee information - Australia

Hi Steve,

If i read it correctly, when rev's up, speed's up too in your case?
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  #12976  
Old 02-12-2015, 12:30 AM
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Re: 2014 Grand Cherokee information - Australia

Hi Steve,

If i read it correctly, when pressed gas pedal, rev's up, speed's up too in your case?
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  #12977  
Old 02-12-2015, 12:51 AM
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Re: 2014 Grand Cherokee information - Australia

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Originally Posted by mmcrh View Post
Hi Steve,

If i read it correctly, when pressed gas pedal, rev's up, speed's up too in your case?

On flat rd with out grade, does the car allow you to change to gear 4 at 30kph using paddle shifter?
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  #12978  
Old 02-12-2015, 02:26 AM
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Re: 2014 Grand Cherokee information - Australia

I strongly suggest not using the manual / paddle shift mode and drive the car around a bit. Report back with any deficiencies when letting the transmission make its own selections.

Cheers,
Steve
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  #12979  
Old 02-12-2015, 02:28 AM
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Re: 2014 Grand Cherokee information - Australia

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Originally Posted by SJandL View Post
I've ordered it from MoparAmerica.com for the grand sum of Aus $288.34 including express DHL delivery. Score!
Slightly better than this!
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  #12980  
Old 02-12-2015, 03:03 AM
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Re: 2014 Grand Cherokee information - Australia

Quote:
Originally Posted by mmcrh View Post
Hi Steve,

If i read it correctly, when pressed gas pedal, rev's up, speed's up too in your case?
Ummm......

If the car is in a good gear for climbing the hill, in this case 3rd or maybe even 2ndd gear as we are doing only 30kph, the engine revs will be about 1700rpm in 3rd or about 2300rpm in 2nd. This is where there is plenty of engine power.
Yes, when pressing the gas pedal the car will accelerate with revs coming up as the speed comes up driving up the hill.
That was what you meant, wasn't it


If the car is in the wrong gear like 4th at 30kph with the engine revs very low (about 1200rpm, there is not much power) trying to go uphil it didn't do anything for a second or 2, until it changed down to a better gear (3rd gear and the revs came up) and the car could drive uphill properly.

There is not enough power for the car to drive up a hill from 30kph in 4th gear.
The car knows this. It should change the gear down to 3rd or even 2nd even if you are in manual mode.
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  #12981  
Old 02-12-2015, 03:11 AM
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Re: 2014 Grand Cherokee information - Australia

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Originally Posted by Barboots View Post
Slightly better than this!
Indeed Steve. And I did ring the parts guy from our dealership (just because I thought it would be an interesting comparison) and he said $1387 but none were available in the country according to his database.



It doesn't matter. I expect to receive the part from MoparAmerica within 10 days.

I have also found a mobile guy for paint work as suggested by IBAJ and BigSkiddy, who after a call to my detailer asking for a recommendation for someone, was put onto this guy and he has quoted $250-$300 to 'bring it up like new' in his words (have sent him close-up pics of damage).

Very happy with that and as it turns out, he is the guy that the dealership calls on for various touch-up paint jobs.

I think we are going to come out of this with a hit to the wallet of less than $700. Can't ask for better than that when you see the damage done. It is less scratched and more gouged and long gauges right back to black.
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  #12982  
Old 02-12-2015, 03:31 AM
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Re: 2014 Grand Cherokee information - Australia

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Originally Posted by mmcrh View Post
On flat rd with out grade, does the car allow you to change to gear 4 at 30kph using paddle shifter?

On a flat road I don't know of it will change up to 4th at under 30kph.
Anyway 1200rpm in 4th gear 30kph won't smoothly accelerate when you push the gas pedal, you should be still in 2nd or 3rd gear when driving through 30kph even on a flat road.


Actually, we just wanted to know if your paddle shifts function properly or not.
+ changes up when you tell it to? , - changes down when you tell it to?


99% of the time just leave the car in D (Auto) let it do its thing.

If something really abnormal is happening when it is in Auto mode, like revving really high and not climbing when in the correct gear, then there might be some problem.

Did you take a video of the instruments engine revs / speed / gear display when driving it, and show it to the dealer when you took it in? I think you really need a video to show it properly.
As you can see, it is very difficult to explain it all just with words.
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  #12983  
Old 02-12-2015, 04:39 AM
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Re: 2014 Grand Cherokee information - Australia

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  #12984  
Old 02-12-2015, 05:15 AM
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Re: 2014 Grand Cherokee information - Australia

Quote:
Originally Posted by Steve1307 View Post
On a flat road I don't know of it will change up to 4th at under 30kph.

Anyway 1200rpm in 4th gear 30kph won't smoothly accelerate when you push the gas pedal, you should be still in 2nd or 3rd gear when driving through 30kph even on a flat road.





Actually, we just wanted to know if your paddle shifts function properly or not.

+ changes up when you tell it to? , - changes down when you tell it to?





99% of the time just leave the car in D (Auto) let it do its thing.



If something really abnormal is happening when it is in Auto mode, like revving really high and not climbing when in the correct gear, then there might be some problem.



Did you take a video of the instruments engine revs / speed / gear display when driving it, and show it to the dealer when you took it in? I think you really need a video to show it properly.

As you can see, it is very difficult to explain it all just with words.

To start with, paddle shifter moves up/down as instructed. I rarely used paddle shifter before the dreaded TCM flash. Now I use paddle shifter on uphill ONLY to find out how car behaves compared to auto mode. Small hills in urban driving, e.g. 80kph zone uphill on great western highway, car speed is 80kph, gear 8th, rpm around 1300 before hill. To maintain car speed of 80kph, I press gas pedal as soon as car start climbing: 1) in auto mode, gear downshifts from 8th to 7th (if im not careful with foot, gear would drop to 6th) , speed 80kph, rpm up; 2) in paddle shift mode, gear maintains at 8th, speed 80kph, rpm up but not as much compared to auto mode.

If the hill is steep, in paddle shift mode, my experience in Bulli tells all. In auto mode, car does not maintain speed despite pressing gas pedal.

Very hard to video record as steering wheel is on the way. But i managed to record 80kph zone uphill on great western highway mentioned in my example above. It took me around 45min driving, many repetitions to record it properly. And yes, the dealer has the footage for a few weeks.

You mentioned that it should be at 3rd gear at speed 30kph on flat rd. Guess what, this was exactly how my car behaved either on flat rd or uphill before the TCM flash. E.G., in auto mode, gear upshift to 2nd at 20kph, to 3rd at 30kph.....to 8th at 80kph. But after the falsh, on flat rd, gear upshift to 3rd at 20kph, to 4th at 30kph.....to 7th at 80kph. On uphill, you know the problem.

If i can borrow my mrs saying, i quote, "i dont care and i dont understand the inner working of the car. If i want to maintain or increase speed, i press gas pedal and the car should responds as intended. You spend so much money on this bloody jeep, yet it cant do what you want. My 8 yo camry can climb the same hill at ease. Sell the bloody jeep". What can i say?
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