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Old 09-07-2015, 11:13 AM   #1
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Transmission or Engine?

I have a 2005 Winnebago Journey 32T DP with the Cummins and Allison 5 speed that just had a strange problem. I was climbing a very small incline and all of the sudden it would barely climb. The coach slowed to about 20 mph and really struggled to maintain any speed. Once I was on a level road it shifted to 2nd (or 3rd) abruptly but did not accelerate normally. When on level road I stepped on the pedal and it would downshift and slow down again. No lights or anything from the information center. Anyone experience this? I really don't want to drive it to a service center until I know what's going on. Thanks.


****Edit**** I just went out and turned the ignition on but did not start the coach. The check engine light is on.
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Old 09-07-2015, 11:44 AM   #2
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Bad fuel filter.

Most road service places can change it for you.
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Old 09-07-2015, 11:53 AM   #3
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Bad fuel filter.

Most road service places can change it for you.
Thanks. Is the decreased power a result of limp mode?
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Old 09-07-2015, 11:58 AM   #4
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Thanks. Is the decreased power a result of limp mode?
Not necessarily, the protection ( limp ) mode " usually " comes after the stop engine light comes on, to give you time to pull over.

Have you recently fuelled up ?

Plugged fuel filter or failed lift pump would be the most likely causes.
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Old 09-07-2015, 12:08 PM   #5
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Not necessarily, the protection ( limp ) mode " usually " comes after the stop engine light comes on, to give you time to pull over.

Have you recently fuelled up ?

Plugged fuel filter or failed lift pump would be the most likely causes.
I have not fueled up recently. I topped it off in the fall and don't usually refill until the spring. It only goes out for exercise in between. Thanks for the help.
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Old 09-07-2015, 12:18 PM   #6
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Fuel may have developed algae while sitting and Cummins uses a return fuel system, in that system 70% + of the fuel supplied to the engine is returned to the tank so the filters will plug up VERY quickly.

So by the time the engine has used 3 gals of fuel over 20 gals of fuel has been through the filter.
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Old 09-07-2015, 12:26 PM   #7
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Fuel may have developed algae while sitting and Cummins uses a return fuel system, in that system 70% + of the fuel supplied to the engine is returned to the tank so the filters will plug up VERY quickly.

So by the time the engine has used 3 gals of fuel over 20 gals of fuel has been through the filter.
If that's the problem should I drain the tank?
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Old 09-07-2015, 01:05 PM   #8
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If that's the problem you should get the fuel polished.

They come to you and run your fuel thru large filters to clean it up.

Buying fuel once a year, sounds like little use and classic case of fouled fuel.
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Old 09-07-2015, 01:19 PM   #9
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If that's the problem you should get the fuel polished.

They come to you and run your fuel thru large filters to clean it up.

Buying fuel once a year, sounds like little use and classic case of fouled fuel.
Unfortunately we did not get to use it much in the last year.
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Old 09-07-2015, 06:15 PM   #10
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Unfortunately we did not get to use it much in the last year.
I would change the fuel filters and see how it runs. If that fixes it then you know what the problem is.
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Old 09-07-2015, 06:21 PM   #11
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When the filters are removed , cut them open to check for algae ( Black slime) if present add algaecide to the fuel and be ready to change the filters again , or have the fuel scrubbed.
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Old 09-08-2015, 09:29 AM   #12
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I tell everyone with a Cummins engine, check inside the frame between the tank and the Lift Pump for a small inline filter/strainer.

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