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post #1 of 2 (permalink) Old 12-02-2015, 02:09 PM Thread Starter
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Help

Does anyone know about the big diesels with diesel exhaust fluid problems? I recently started working on school buses and have cods like crazy because they don't get driven fast enough. The one I have is in a 2011 Thomas bus and is a 6 cylinder Cummings.
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post #2 of 2 (permalink) Old 12-03-2015, 01:29 PM
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Do you have code numbers?
Is it DEF or DPF problems? DPF's WILL plug if engines are not worked hard to get exhaust temps high enough to burn the soot out of the DPF. Tell the drivers to drive with a lead foot. Idling time is the worst and I imagine a school bus has plenty of idling. Does the bus have a high idle feature to raise the rpm's if it has to be idled for any length of time?

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