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Old 12-09-2016, 09:08 PM   #1
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Cool weather air pre heating?

I have picked up a 96 navigator last summer. It has a Cummins M11-400E engine. Its a beautiful thing. That said I live in cold country and like to use the coach in the shoulder seasons when temperatures here can drop well below freezing. Its a hard start in 20 degrees. The documentation on the coach refers to a "Beru open flame air pre-heater", and there is a warning on the engine cowling stating "caution to not use starting fluids in air intake, may cause explosion damage" ect. Instructions say turn on ignition wait for light to drop, aprox. 30 seconds, and hit it. No improvement.
Dont see anything on intake manifold, no glow plug. Where would this pre-heater be. In cylinder heads?
Anybody know anything about this stuff give me a shout.
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Old 12-09-2016, 09:41 PM   #2
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Cummins uses 'grid heaters' that are on engine intake right below where air horn attaches to intake manifold

When ambient air temp is below 59*F they will come on.......turn ignition to ON (not start) and they will be energized for up to 30 seconds.
When temps are very cold cycle the ignition couple times to the repeat energize cycle of the grid heaters
They draw 95A plus each so you should see Battery Voltage drop when they get energized.
They will continue to cycle after engine is started until intake manifold temp comes above 59*F

Yours may not be working....
Battery Voltage via a solenoid and large guage wire to inatke

And in very cold temps..like the 20*F you mentioned you should have and be using a 'block heater'. Heat rod that warms the coolant when plugged into a 120V AC source. Aftermarket heaters available that go into oil dip stick and heat the oil
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Old 12-09-2016, 09:53 PM   #3
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Thanks
Will look below air horn again for grid. Will try double cycle. Should be some heavy wiring which i don't see? Thanks for fast reply. 10 degrees today. Have plugin block heater but would like to see this intake heater work. Wondering if its even equip t with one?
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Old 12-09-2016, 10:37 PM   #4
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Cummins intake grid heaters......under the hand open area with wire grids.
Intake horn has been removed in order to see them

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Old 12-16-2016, 09:45 PM   #5
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BERU Cold-Start Aids for Commercial Vehicles | Federal-Mogul Global Aftermarket
I don't know anything about your system, but sounds like it isn't working.BTW, yours is first on the page. Perhaps the controller is bad?
I'd contact a nearby HDT repair shop for diagnosis and repair.

Update: I just found this 2010 irv2.com thread that may help: Manifold Flame Heater
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Old 12-23-2016, 05:23 PM   #6
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Another thing you might try is plugging in your engine block heater the night before.
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Old 04-10-2017, 02:15 PM   #7
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I do It works. Thanks
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