heip 8v92 ddec2

Flatspot · November 18, 2011, 01:18:41 PM

Sounds like you got a deal.
I suspect that you are learning DDECII, just the hard way.
I really like my DDECI and Clifford will tell you it's because I don't have a Cold Starting Aid adjustment to mess with.
It sounds like you have some kind of external load pulling down your voltage to the ECM.
If you watch your headlights do they go dim and then dark like the voltage meter on the dash?

Larry

muldoonman · November 19, 2011, 06:24:08 AM

Hey Jim, What model of year model of 8v do you have? I have all schematics of 91 prevost in my coach. I can't read um, but got um. If I can help let me know.

Good Luck.
glen

jimsflx · November 19, 2011, 12:30:46 PM

glen itis a ddec2 i think thinging mid 80,s . called mci friday morning but they never returned my call.was trying to get the secmatics from them.i will try again monday. thanks jim

Hard Headed Ken · November 19, 2011, 03:44:38 PM

Here is a link to my pictures of the DDEC II ECM pin outs if it helps any.

Ken

http://www.mediafire.com/?agivpxygaw3vcb2,9o8siucilhogdz4,uwkk2y0h7pcms96,aofkpjj6dd54ngj,z9m36dkr2exaxr7,dfn4cium76lnb55

jimsflx · November 20, 2011, 03:09:16 PM

thanks ken for the info jim

Busted Knuckle · November 27, 2011, 02:50:42 PM

So have we any ideas as to what the problem/cure was/is?

BK

luvrbus · November 27, 2011, 02:53:11 PM

BK he either got the problem solved or removed the engine and going with a MUI engine lol

Busted Knuckle · November 27, 2011, 03:44:27 PM

Quote from: luvrbus on November 27, 2011, 02:53:11 PM
BK he either got the problem solved or removed the engine and going with a MUI engine lol

jimsflx · November 28, 2011, 02:28:48 PM

no,did not get fixed yet took off for thanksgiving we borrowed another ecm tried it. did not help.still shuts down. it ran about 30 min. then shut down. jim

Ace · December 01, 2011, 04:46:30 AM

I took the pro-link back yesterday and had a little more time to spend and here's what we have.
No codes no matter how many times it shuts down. It has multiple history codes and I can erase them but after starting back up, they reappear.
Personally, I feel like its a fuel issue. Before I arrived and per my phone call I suggested running the coach from an outside source of fuel. They had about a 15 gallon jug there with both feed and return lines going into it. They said it ran well for about 30 minutes and shut down again. When I got there, it ran but shortly after it shut down as if it ran out of fuel.
After checking one filter then the other both were found to be completely dry. My guess us that there is a fuel line from the primary filter to the pump that is being sucked closed.
The bus will start up almost right away but seems that each time it starts it has a shorter run time. My thinking is the cold fuel is getting warm and causing the rubber in the hose to get soft because in the morning when it's colder the bus runs the longest.
Then again it could be simply the fuel pump acting up too.
I think the next plan of attack is to change the fuel lines that haven't already been changed and start there.
It was also considered to check the idle shut down and I did but to first get around that was to watch the dash while running and just before it would shut down as the cel light came on we could step on the brake pedal which would reset the idle time but after learning that the bus not only shuts down while idling it shuts down while being driven so that was a moot point and the idle shut down was disregarded as the problem.
Also the historic codes were: 15,16,26, 36, or maybe 24 and 34 and about 3 or 4 others but just don't think it's electrical.

luvrbus · December 01, 2011, 05:30:53 AM

Strange those are all failed circuit codes except 26 the aux shutdown active code it will be something simple lol

good luck

robertglines1 · December 01, 2011, 06:19:10 AM

Is this the one with the fuel cooler for the DDec unit attached to the side of the unit. Be careful with those connections. that fuel cooler is soft brittle material. I broke mine once. About $100 It's purpose is to cool DDec system. Again this install has been run successful in past?? In this bus? Bob

luvrbus · December 01, 2011, 06:50:40 AM

If he didn't change anything that engine should run

jimsflx · December 01, 2011, 03:01:16 PM

bob this motor is a reliabilt by detroit 8 years ago set for the last couple years. we think that the bus came with 6v92 when new then change to this motor.changing the fuel lines today.from filters to pump and beyound about 4 lines , might be one line collapase when fuel gets hot. thanks jim

rv_safetyman · December 01, 2011, 03:37:16 PM

Jim, I don't know about MCI, but Eagles have a check valve in the delivery line. If at all possible I would try to replace the line from the tank to the first filter and install a new check valve if you have one. It is common practice to use DOT tubing which is pretty inexpensive.

If this is a fuel issue (I am not convinced yet), some folks have had problems with the dip tube in the tank developing holes so that it will not pick up fuel below the hole in the dip tube.

Lastly I, again, want to strongly recommend that the primary and secondary filters be replaced with a Fuel Pro filter: http://www.davco.com/DFP-_fp382.htm These are a bit pricey (some find them on ebay). They will tell you in one second if you have a fuel delivery problem (via the clear fuel bowl).

Jim