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Author Topic: 92 Prevost DDEC 2  (Read 6091 times)
gyoder
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« Reply #45 on: March 15, 2013, 08:51:35 PM »

Voltage sensitive - that is the killer of DDEC ECMs.

Make sure you have enough voltage, and not too much.

That is what I have learned, from experience.

I now start my genset (wired to charge my main batteries), if I have left the vehicle alone for any length of time, to be sure that the ECM gets full 12V.

It is worth the cost of fuel to make sure the volts are all there.

thanks, I had Diesel ECM in Dallas rebuild my ECM and I am going o install it tomorrow and start this beast tomorrow
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luvrbus
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« Reply #46 on: March 16, 2013, 06:14:47 AM »

So can we presume the DDEC II got a taste of 24v ? or did the clock battery go dead from setting so long without power
« Last Edit: March 16, 2013, 06:34:39 AM by luvrbus » Logged

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gyoder
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« Reply #47 on: March 18, 2013, 04:44:25 PM »

So can we presume the DDEC II got a taste of 24v ? or did the clock battery go dead from setting so long without power

It never set a code and it was still readable but when the guy put the battery on backwards he spiked the ECM , I had it rebuilt and she fired up, but I have a world of illness with this one, the spike also get the alternator, I am replacing it and going one step at a time in replacing stuff the spike got.
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Electman
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« Reply #48 on: April 11, 2013, 02:45:15 PM »

DDEC II can be upgraded to DDEC III, no DDECIV available for a coach 8V92. The down side is DDECIII inability to comunicate with the ATEC1 (CEC) transmission controls.
The right way to upgrade is to upgrade the transmssion to a WTECIII controlled HD 6 speed and the engine to a DDECIII, which will comunicate and give you optimum performance.
Just completed one, results where awesome!
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Sam 4106
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« Reply #49 on: April 11, 2013, 04:57:04 PM »

Electman,

What does it take to upgrade an 8V92TA DDEC II to a DDEC III? When I had to replace my DDEC II ECM last summer I asked about an upgrade and was told by Interstate Detroit Diesel in Sioux Falls, SD that it couldn't be done. Then again at Interstate Detroit Diesel in Fargo, ND I was told the same thing. How did you do it? I have an Allison 740 transmission so no electronics there.

Thanks, Sam
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1976 MCI-8TA with 8V92 DDEC II and Allison HT740
luvrbus
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« Reply #50 on: April 12, 2013, 05:32:16 AM »

There is no need to upgrade Sam unless you are going to one of the newer electronic transmission but you can upgrade your 8v92 to a DDEC lV if that is what you want it will cost you a new ECM
« Last Edit: April 12, 2013, 05:41:33 AM by luvrbus » Logged

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Sam 4106
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« Reply #51 on: April 12, 2013, 06:12:21 AM »

Clifford,

I don't want to upgrade now, but as long as I had to replace my ECM last summer anyway, that is when it would have been practical to upgrade. But, I was told twice that I couldn't. That is why I asked how Electman did it. From reading another post of his, I think he upgraded by changing both the engine and transmission as a package. I hope he responds to my question so I can know for sure.

Thanks, Sam
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1976 MCI-8TA with 8V92 DDEC II and Allison HT740
muldoonman
1991 Prevost 8V92TA
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« Reply #52 on: April 12, 2013, 06:33:28 AM »

What would be the advantage of upgrading the ecm's on an older (91/92) 8v92 with the 755cr?
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rv_safetyman
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« Reply #53 on: April 12, 2013, 12:41:05 PM »

Detroit sells a kit to convert a Series 60 DDECII to a DDECIV:

http://www.ddcsn.com/cps/rde/xbcr/ddcsn/18SP546Rev.pdf

I thought that the kit would also work for other DDEC engines, but apparently not.  Boomer did quite a bit of checking on his 6-71T DDEC engine and they said it would not work for his engine.

As you will see in the bulletin, you add a couple sensors and that would be of benefit. 

Kind of strange that they say it is for a manual transmission.  The DDECIV has J1922 communication that can talk to a lot of automated transmissions like my Autoshift.

If you get the latest DDECII you get most of the output data that talks to things like the SilverLeaf products.  Older DDECII units are not good about reporting speed related data.

I think that the conversion to DDECIV (if there is a way to do it) would be well worth it (assuming you had to buy an ECM anyway.  The software that controls the engine is much more sophisticated.

Jim
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Jim Shepherd
Evergreen, CO
85 Eagle 10/Series 60/Eaton AutoShift 10 speed transmission
Somewhere between a tin tent and a finished product
Bus Project details: http://beltguy.com/Bus_Project/busproject.htm
Blog:  http://rvsafetyman.blogspot.com/
luvrbus
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« Reply #54 on: April 12, 2013, 04:02:27 PM »

Sam,,unless you have a real early version of the DDEC 11 they are not that hard to upgrade to a 111 or IV, early versions of the 11 require a cam change because unlike a 60 series there is no bull gear you can change like on the early 60 series then it gets costly.

All I have been around just takes the new harness's,programing,a couple extra sensors and a new crankshaft positioning sensor ,  is yours a  Motorola ECM ? The 111 is faster and has more memory than a 11 but that is no asset for you using a 740
« Last Edit: April 12, 2013, 04:29:27 PM by luvrbus » Logged

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muldoonman
1991 Prevost 8V92TA
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« Reply #55 on: April 12, 2013, 05:35:39 PM »

My 1991 8V92TA, 62,000 mile coach is running like a top. I think I'll stay with what I got till she blows.
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Sam 4106
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« Reply #56 on: April 12, 2013, 07:23:01 PM »

Clifford,

I am not interested in changing from DDEC II to anything else at this time. My original 1990 ECM was a version 111 my current ECM is version 154. My fuel milage dropped dramatically after the ECM change, but that is also when my engine started smoking badly. The smoking problem was from a blown exhaust manifold gasket, that has been fixed. I also cut a hole in the side of the bus above the air cleaner intake to allow the engine to breath better. It will be interesting to see if the fuel mileage goes back to the previous level after I drive the bus enough to use a few tanks of fuel. 

Thanks, Sam
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1976 MCI-8TA with 8V92 DDEC II and Allison HT740
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