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Author Topic: Bus won't stay running  (Read 3864 times)
alltech
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« on: March 31, 2007, 08:51:13 AM »

I have an an 8V92 with a DDEC 2

My bus is cold and when I start it up it runs for 10 secs the eng light comes on and and it shuts down in another 20 secs. I shut my power off and turn it on and it fires up and does the same thing.

All my fluid levels look good and oil pressure is about 50psi

I am not sure what might be the problem, any ideas

Thx Ross
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1988 102C3 8V92
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« Reply #1 on: March 31, 2007, 09:04:16 AM »

check your coolant sensor... they are notorious  for failing. Or get your codes checked
Ron
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Hartley
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« Reply #2 on: March 31, 2007, 09:05:22 AM »

Fuel Pressure?

Might want to see if the DDEC senses the fuel pressure or maybe look at how long it's been since you changed fuel filters.

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alltech
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« Reply #3 on: March 31, 2007, 09:21:16 AM »

One other thing

The overide switch dosen't seem to keep it from shutting down?

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1988 102C3 8V92
niles500
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« Reply #4 on: March 31, 2007, 12:33:58 PM »

Under the heading 'easiest things first' - as said above, is it putting out a code(s)? - also check your engine compartment run switch - HTH
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Ace
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« Reply #5 on: March 31, 2007, 01:22:47 PM »

Ross more than likely its a faulty coolant sensor. I had the same exact thing on my 8v92. Simple replacement at about 25 bucks. It would be best to check the engine fault codes first. It could be another issue but I have my doubts!
Ace
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Ace Rossi
Lakeland, Fl. 33810
Prevost H3-40
alltech
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« Reply #6 on: March 31, 2007, 09:20:59 PM »

How do you check the codes?

Is there a device you buy, or does it have to get towed into a Detroit Service Center
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« Reply #7 on: March 31, 2007, 09:49:15 PM »

Ross, If DDEC2 sensors are unplugged at the source they are no longer recognized. My DDEC2 acted like yours when it was only 2 quarts low on oil. Computer shutdowns are for idiot proofing. Go straight to DD and have them eliminate the function. You will still get warning lites and you can choose when and where to stop. DD can turn off the auto shutdown and give you another 150 RPM with droop function using the hand held reader. Then you will have a lot more confidence in your coach always bringing you home, deservingly so. Eagle has a test switch to hold on. DDEC then flashes codes with a blinking lite. 2 blinks followed by 1 blink is code 21 etc. While at DD, ask them to clear your history codes so you can start out fresh. DD can do all these things with out hooking you to the mainframe. They are parameters that can be set with the hand held unit and DD has never charged me to use it on my coach.
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« Reply #8 on: March 31, 2007, 10:08:23 PM »

Ross - you should be able to flash the codes by using the intructions in DA Book - If you don't have one, get one - you'll need it - let us know if you don't have have one and need walked through the process - HTH
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Sammy
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« Reply #9 on: April 01, 2007, 07:13:35 AM »

Ross, what kind of coach do you have?
There will be an "override" or "test" switch somewhere in the dashboard area.
It should be a "momentary" type switch.
Turn master switch to "run" position (engine does not have to be running), press "override" switch once, watch "check" and "stop" engine lights blink on and off. This is called 'flashing" the codes.
The "check" engine light will flash the inactive codes, the stop engine light will flash active codes.
Count the flashes as already mentioned and post the code you are getting with the stop engine light .
I'll be happy to help you from that point.

Sammy  Cool
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alltech
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« Reply #10 on: April 03, 2007, 07:36:24 AM »

I  have a 102C3 DDEC II, just to the right of the master switch is a engine shutdown override.

I turned the master switch on, and pushed the engine override with but nothing happened, no flashing lights, also the engine override switch, does not override the shutdowns the engine shuts down regardless of hitting that switch.

I have unhooked the low coolant sensor, and that did nothing.

I am wondering if it being about 25 F outside my bus fires up good, but with the 40 wt oil if it is flowing good enough to get back to the oil pan before it shuts me in on low level?

What is a DA Book

Thx for all the help

Ross



« Last Edit: April 03, 2007, 07:38:45 AM by alltech » Logged

1988 102C3 8V92
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« Reply #11 on: April 03, 2007, 08:13:52 AM »

Ross I started another thread regarding my recent experience of shut down! I really think in my case that my batteries are just too low to keep it running but they have just enough juice to get it started!

Are your batteries fully charged or partially charged?

Also somewhere on the coach there should be a toggle switch for DDEC testing. Mine does anyway. I turn the ignition key to "on" and flip the test switch. The check engine and stop engine lights will blink the codes as described elsewhere in thsi thread.

Ace
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Ace Rossi
Lakeland, Fl. 33810
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« Reply #12 on: April 03, 2007, 08:23:17 AM »

I'm not sure about the MCI's, and I can't remember what tpe of bus it was but some bus I orked on once you had to cycle the ignition on-off-on-off-on and wit and it would flash the codes on the shut down lights! FWIW BK  Grin
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« Reply #13 on: April 03, 2007, 10:49:23 AM »

Ross, once the engine is running, and the alternator working, then you have more than adequate power to operate everything. Probably a couple of hundred amps available to recharge batteries and operate any other electrical device on the coach. The big question: is the alternator working?
Richard
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« Reply #14 on: April 03, 2007, 11:24:55 AM »

                                              coming directly from Prevost, there is always a low battery drain regardless if the batteries are switched off religously or not coming from the original dash radio if it has one, and definitely the DDEC which has a memory and the ATEC also because of it's memory.

In other words (his) if it has any kind of memory, it will drain the batteries over a 2 week period if not started!

As in my case, he agreed that even though the bus starts easy with low voltage batteries or not fully charged batteries, there is not enough voltage to keep it running before the sensors kick in and shut it down, and, when it  does start, it isn't run long enough to charge the batteries fully before it shuts itself down! Sort of a catch 22!

He also advised on installing a marine type trickle charger tied into the house batteries, which when plugged into shore power while sitting idle for any length of time are always maintained via the inverters own internal charger!  The same would occur for the coach batteries as well!

So even though the alternator is working, you need a full set of FULLY charged batteries to keep it running IF equipped with a DDEC!

Ace
« Last Edit: April 04, 2007, 07:27:48 PM by Nick Badame Refrig. Co. » Logged

Ace Rossi
Lakeland, Fl. 33810
Prevost H3-40
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