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Old 05-19-2019, 12:36 AM   #1
Mini-Skoolie
 
Join Date: Apr 2019
Posts: 18
dt466e starting problems and smoke

Sometimes the bus takes a very long time to start. Between attempts there is smoke filling the tail pipe even with the engine off. When it starts, it puts out alot of smoke for about 15 seconds.

It does not always do that. Sometimes it starts quick and smokeless.

Thank you
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Old 05-19-2019, 03:08 AM   #2
Bus Nut
 
Join Date: May 2018
Location: topeka kansas
Posts: 551
Year: 1954
Coachwork: wayne
Chassis: old f500- new 2005 f-450
Engine: cummins 12 valve
Rated Cap: 20? five rows of 4?
what i think is happening

When you "crank" the engine the injectors are putting fuel into the engine but the fuel does not ignite and burn. The unburned fuel is the smoke you get after the engine starts. When the engine starts quickly, you do not have the build up of unburned fuel so you do not have the smoke. If the air/fuel mix can not get hot enough the fuel will not burn. some of the causes of not enough heat, are a slow turning engine, that could be a result of weak batteries not providing enough power to the starter motor. Bad connections at battery cables, Worn out starter motor. another cause could be worn pistons/rings/cylinder bores, that leads to low compression, low compression will not heat air/fuel mix enough to burn. anyways, lots of possibilities.

william
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Old 05-19-2019, 11:57 PM   #3
Mini-Skoolie
 
Join Date: Apr 2019
Posts: 18
Quote:
Originally Posted by magnakansas View Post
When you "crank" the engine the injectors are putting fuel into the engine but the fuel does not ignite and burn. The unburned fuel is the smoke you get after the engine starts. When the engine starts quickly, you do not have the build up of unburned fuel so you do not have the smoke. If the air/fuel mix can not get hot enough the fuel will not burn. some of the causes of not enough heat, are a slow turning engine, that could be a result of weak batteries not providing enough power to the starter motor. Bad connections at battery cables, Worn out starter motor. another cause could be worn pistons/rings/cylinder bores, that leads to low compression, low compression will not heat air/fuel mix enough to burn. anyways, lots of possibilities.

william
Thanks for the smoke explanation. The other things you mentioned cannot be the case since the engine sometimes starts right away. And also it cranks fast so no battery issue and once again, it could not be since it sometimes starts normally. thanks
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Old 05-20-2019, 12:09 AM   #4
Bus Crazy
 
Join Date: May 2016
Location: Georgia
Posts: 1,416
Year: 2001
Coachwork: Blue Bird
Chassis: IH
Engine: T444E
Rated Cap: 14
Does it start quickly after short amounts of time of being off, and harder to start after being off for longer times? Perhaps the fuel pressure is bleeding off and the fuel system has to build up pressure/prime itself after an extended shutdown.
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Old 05-20-2019, 12:26 AM   #5
Mini-Skoolie
 
Join Date: Apr 2019
Posts: 18
Quote:
Originally Posted by Brad_SwiftFur View Post
Does it start quickly after short amounts of time of being off, and harder to start after being off for longer times? Perhaps the fuel pressure is bleeding off and the fuel system has to build up pressure/prime itself after an extended shutdown.
I am not sure. I have to pay attention. But if that was the case how come there is smoke in the tail pipe. Wouldn't that mean the fuel system works? Thanks
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