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Author Topic: Engine won't start  (Read 8534 times)
CAROLINABOY
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« on: December 11, 2008, 08:36:36 PM »

Hey everyone I have a 6v92 ta and it will turn over but won't crank is the first time its done this so I don't know what to do, someone suggested that it lost prime but would I not see or smell fuel?
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Jriddle
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« Reply #1 on: December 11, 2008, 08:40:30 PM »

Is it making white smoke when turning over?
John
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John Riddle
Wells NV
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Blacksheep
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« Reply #2 on: December 11, 2008, 08:42:12 PM »

If you can, remove the fuel filter and see if there is fuel in it. If not then you must re prime the system. There are instructions on how to do so in the archives or past threads pertaining to this procedure.

What type bus do you have and when you try to start it, do you notice smoke? If so, what color is the smoke? All important questions to answer your request more thorough!!

Ace
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CAROLINABOY
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« Reply #3 on: December 11, 2008, 08:44:40 PM »

1986  GMC RTS 40' 6V92TA T806
Yes it is white smoke when turning over
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makemineatwostroke
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« Reply #4 on: December 11, 2008, 08:45:58 PM »

C Boy is the engine mechanical or DDEC    have a great evening
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Jriddle
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« Reply #5 on: December 11, 2008, 08:46:58 PM »

How cold is it out? You are getting fuel with white smoke.
John
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John Riddle
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CAROLINABOY
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« Reply #6 on: December 11, 2008, 08:48:42 PM »

don't know about fuel will check this weekend and it is mui
   todd   its about 50 degrees out
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Blacksheep
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« Reply #7 on: December 11, 2008, 08:49:13 PM »

Sounds like your getting fuel with white smoke so I would leave the filters alone!

I would check for a stuck E shut down if it has one but like you were asked, is it a DDEC or not?

Ace
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Busted Knuckle
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« Reply #8 on: December 11, 2008, 08:51:29 PM »

Sounds like your getting fuel with white smoke so I would leave the filters alone!

I would check for a stuck E shut down if it has one but like you were asked, is it a DDEC or not?

Ace

Ace he already answered that MIU. MANUAL INJECTION UNIT! FWIW Grin  BK  Grin
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Busted Knuckle aka Bryce Gaston
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Blacksheep
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« Reply #9 on: December 11, 2008, 09:01:12 PM »

Yea BK I missed that as they were being posted faster than I could type and think at this time of night!  Roll Eyes
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makemineatwostroke
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« Reply #10 on: December 11, 2008, 09:07:33 PM »

C Boy try to reprime the engine they will blow white smoke when air is in the system.    have a great evening
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jjrbus
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« Reply #11 on: December 12, 2008, 04:10:31 AM »

I'm confused, how can they produce white smoke with air in system? If I was blowing smoke, fuel would be the last place I would look.
                                                           Jim
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luvrbus
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« Reply #12 on: December 12, 2008, 04:43:18 AM »

Jim, I don't know about all Detroit's but my 8v92 will  pump out white smoke and will not start with air in the system and so will Van's( bike whisperer) 6v92 I think it is because it is getting some fuel but not enough fuel for atomization. good luck
« Last Edit: December 12, 2008, 04:53:29 AM by luvrbus » Logged
GM0406
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« Reply #13 on: December 12, 2008, 06:06:32 AM »

I can make white smoke anytime!  Just keep trying to start with no or little air and you can turn your DD into a white smoke machine.  I have a shim that I put in between the throttle stop to open the air to start the engine.  Works just great.  This keeps idle up to prevent low oil pressure on warm up and I have this shim tied to a nylon line.  As soon as air pressure builds and I am ready to go, I punch the throttle a little and the shim drops out. 

My 8V71 TA starts instantly with the shim in place.  My shim is ~1/4".  I don't have this problem with the 671, but it is standard transmission and is set for higher idle = more air on start.  But my 871 has as an Allison.  No way am I going to go with high idle on that unit!  I don't want her clunking in and out of gear! 

The shim completely solves my no start or smoke problem.  If I forget the shim, then I bet I can outsmoke you!  Simple solution to an annoying problem.  And I am not surprised that it has not been mentioned here.  Took me a lot of quizzing around before I solved that one.  Of course, you could do a sophisitcated electric fast idle modification.  Air is useless as there is no pressure on a cold start! 

Someone here may have a better mousetrap for this and a lot of us are participating here to get educated one way or the other.  I don't know much, but this smoke thing had to go if you know what I mean. 

Bill T.
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JackConrad
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« Reply #14 on: December 12, 2008, 07:14:51 AM »

Just a thought, are you sure the engine is spinning fast enough?  It doesn't take much of a drop in spinning RPM in cold weather to create a no start situation. Cold engine, maybe batteries not quite up to par?, it doesn't take much.  Jack
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