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Old 10-04-2006, 07:34 AM   #1
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About a month ago we noticed that the engine was a little rough when we first started it. This was when we got to the Great Lakes region with cooler temperatures and lots of moisture. Then we noticed white smoke coming the next morning as we started. We were in a Coach Care facility and asked them to look at the problem. Of course, once started, she warmed up and couldn't recreated the problem. They found a bad sensor and replaced it and we hoped that would do the trick. It didn't. We have found that we need to plug in the heater block the night before we leave. About 4-5 hours and then she starts just as smooth as pie. We're back at the Coach Care facility and nothing comes up as a fault code. They have checked everything and everything appears normal - but the problem is still there. Anybody ever have anything like this?
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Old 10-04-2006, 07:34 AM   #2
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About a month ago we noticed that the engine was a little rough when we first started it. This was when we got to the Great Lakes region with cooler temperatures and lots of moisture. Then we noticed white smoke coming the next morning as we started. We were in a Coach Care facility and asked them to look at the problem. Of course, once started, she warmed up and couldn't recreated the problem. They found a bad sensor and replaced it and we hoped that would do the trick. It didn't. We have found that we need to plug in the heater block the night before we leave. About 4-5 hours and then she starts just as smooth as pie. We're back at the Coach Care facility and nothing comes up as a fault code. They have checked everything and everything appears normal - but the problem is still there. Anybody ever have anything like this?
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Old 10-04-2006, 03:54 PM   #3
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White smoke is unburned fuel. Injectors in your coach are, I believe, electronically controlled to inject at a particular relationship to top dead center, so they are not injecting properly vs. TDC or they are over-delivering fuel.
My guess is either a bad sensor related to temperature or a bad sensor connection (wild chance its the TDC sensor but probably not). Good luck. They'll probably need to have it on the computer for a cold start and do a data capture (I think they can do that w/the Cummins software).
I don't think you can hurt anything w/this condition, other than air quality.
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Old 10-04-2006, 06:57 PM   #4
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Thanks Mike, they put the computer on today and got the data and have been discussion it with several people at Cummins. Since they get no error codes, they are thinking it is controller that is malfunctioning in keeping the pre-heater heating for the proper period of time. So they are going to look at the part tomorrow. Engine is running fine, so it is a matter of finding what is interfering with getting the pre-heating done. We can always plug in the block heater at night - that does the trick and we then have no white smoke blowing and the engine starts smooth as can be.
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Old 10-04-2006, 07:08 PM   #5
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For colder temperature operation grid heater pre-heats air in the intake system before it enters the engine. That means better cold weather performance, reduced cranking time, increased starter life, and reduced white smoke. Check the 2 grid heater solenoids in the right rear engine panel. They are marked, grid heaters solenoid 1 & 2. White smoke is from the cylinders that aren't igniting when you start the engine.. One of these grid heaters is not working.
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