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  #37  
Old 09-29-2014, 12:26 PM
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Re: Newest TCM flash. Don't get it if you're not having issues

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Originally Posted by Banjo View Post
Raven...Please don't let the rantings of one asshole run you off this forum as most of us appreciate your knowledge and efforts here.

Asshole? Fair enough. I accept that. But I don't much care for whining. If that is accepted, or at least tolerated, practice on this forum, thank you for pointing out the ground rules to me, I apologize for my indelicacy, and I will refrain from commenting further on the subject.

Raven, I'm sorry if I offended you. Don't let my ill humor dissuade you from participating. I will honor my commitment.


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  #38  
Old 09-29-2014, 12:58 PM
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Re: Newest TCM flash. Don't get it if you're not having issues

Raven: FWIIW, you are on to something. Jeep has done the exact same things with the flashes for the 9 speed in the Cherokee. Something told me not to get any of the 9 speed flashes and for the most part my 9 speed shifts fine without them. Maybe it is a little rough around the edges but after all it is a Jeep and not a Lexus. Herein is my take on the problem. In an effort to increase sales and market share Jeep has tried to be all things to all people. Thus we now have mall cruisers and soccer mom Jeeps, front wheel drive, rear wheel drive and 4 cylinders for fuel economy. The crowd Jeep is catering to now is a different group than the hard core Jeep enthusiast. I just got done serving 3 months on a Chrysler/Jeep paid focus group. It was interesting that the number one complaint was that people's Jeep did not drive, ride, perform, or have the fit and finish of their previous foreign luxury vehicle. So what I think Jeep is doing to address this complaint is to basically detune our Jeeps as we know them and slowly turn them into luxury boulevard highway cruisers. I think Jeep is eventually going to wind up losing both groups in doing this, the hard core Jeep enthusiast and the cruiser group. My suggestion would be to return Jeep to its roots and relabel everything else Dodges. Make the Jeep perform like its heritage. If people want a super smooth shifter and great fuel economy buy the highway cruiser from Dodge. If you want a rugged vehicle capable of going off road and may ride, drive like that buy a Jeep. Chrysler/Jeep can throw all of the flashes it wants at Jeep transmissions. They will never get one that will satisfy both camps and that basically is the problem.
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  #39  
Old 09-29-2014, 01:37 PM
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Re: Newest TCM flash. Don't get it if you're not having issues

The problem isn't that it shifts like a Jeep. The 8 speed + high torque at low RPM diesel has an operational issue (shuddering) that affects a significant number of vehicles. A TSB to patch the TCM to compensate was needed. Unfortunately the solution is to avoid higher torque at low RPMs.

Fortunately the vehicle drives pretty well with the "improvements" but is a little more rev happy in hills and under hard acceleration.
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  #40  
Old 09-30-2014, 07:16 PM
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Re: Newest TCM flash. Don't get it if you're not having issues

Is it the TCM update that does it? There is also a PCM update and my Car is in the shop now and told them not to do TCM update as my diesel has never had a problem but that they should do the PCM one but if it cuts power in low end I don't want it


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  #41  
Old 09-30-2014, 07:21 PM
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Re: Newest TCM flash. Don't get it if you're not having issues

The reason I ask this is because earlier I heard mention of a reduction in the pulse width of the fuel injection and to me that sounds like a PCM update


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  #42  
Old 09-30-2014, 08:45 PM
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Re: Newest TCM flash. Don't get it if you're not having issues

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Originally Posted by JesseMH View Post
The reason I ask this is because earlier I heard mention of a reduction in the pulse width of the fuel injection and to me that sounds like a PCM update
According to Raven, the knowledgable guy we ran off, the TCM monitors the pulse width % from the ECU (PCM) and anything over 20% now triggers a downshift. I'd avoid the TCM update if you haven't had any shuddering.
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  #43  
Old 10-01-2014, 04:00 PM
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Re: Newest TCM flash. Don't get it if you're not having issues

Thank you


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  #44  
Old 10-01-2014, 11:15 PM
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Re: Newest TCM flash. Don't get it if you're not having issues

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Originally Posted by ExcursionDiesel View Post
According to Raven, the knowledgable guy we ran off, the TCM monitors the pulse width % from the ECU (PCM) and anything over 20% now triggers a downshift. I'd avoid the TCM update if you haven't had any shuddering.
Close.. sorry still getting emails so I came back to tie up some loose ends.

The TCM is requesting tq reduction. The ecm does this by reducing pulse width.

It is 100% the newest tcm flash. And my fuel economy is horrible now. Down to 23 mpg average with 90% of my driving done 50-65 mph. Confirmed via hand calced numbers. The constant down shifts are murdering economy
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  #45  
Old 10-01-2014, 11:19 PM
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Re: Newest TCM flash. Don't get it if you're not having issues

Thats basically where my mpg's are down to as well, and Im light on throttle. Also in a hilly area.
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  #46  
Old 10-01-2014, 11:19 PM
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Re: Newest TCM flash. Don't get it if you're not having issues

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Thats basically where my mpg's are down to as well, and Im light on throttle. Also in a hilly area.
It's unsat... defeats the whole purpose of buying the diesel.
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  #47  
Old 10-01-2014, 11:22 PM
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Re: Newest TCM flash. Don't get it if you're not having issues

Has anybody bitched to Jeep about the MPG?
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  #48  
Old 10-01-2014, 11:27 PM
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Re: Newest TCM flash. Don't get it if you're not having issues

I am going to very soon. Been very busy. Its sad when my cummins gets 5mpg with in range of the JGC mpgs driving around town . And my Cummins done the F up one of a kind. All kinds of weight blah blah. .

I did do 300 miles of highway and got 30ish mpgs. But it lost it on the hills. Bet they do a big recall on tranny in say 2-4 year.
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