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M-11 Help Needed

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Old 07-17-2012, 07:07 PM   #1  
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M-11 Help Needed

What would cause an m-11 to just start billowing black smoke and miss at idle and through the whole rpm range?
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Old 07-18-2012, 12:42 AM   #2  
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A really bad injector. Or more than one.

It does happen from time to time.

I was working on a kenworth the other day, that has a backfiring problem. Well, turns out it had a couple of injectors hanging hard enough to load the exhaust with fuel residue, and occasionally it would fire off. Loud, like a 10 gauge shotgun.

It exhibited the same symptoms prior to the backfiring beginning.
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Old 07-19-2012, 08:57 AM   #3  
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My friend replaced all the injectors and the cam sensor and it still does the same thing. Next step would be ecm replacement?
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Old 07-19-2012, 10:44 AM   #4  
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I would see if there is a software update or code present. My dad's had a slight miss occassionaly and they did and ecm update and problem went away. No black smoke on his.
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Old 07-19-2012, 03:53 PM   #5  
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What are the boost pressures? Check for bad CAC, was a new fuel pump put on recently?
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Old 07-21-2012, 02:52 PM   #6  
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Would low coolant or a bad coolant sensor cause this? The ecm tested good at cummins but it had a coolant code in it. The owner said it would start missing going around corners which makes me think its low on coolant.
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Old 07-26-2012, 08:03 AM   #7  
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Is it actually missing as in dropping a cylinder or is it derating from a perceived lack of coolant?
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Old 09-26-2012, 09:35 PM   #8  
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Update. Turned out one of the new injectors was faulty. Runs great now. Its still using coolant last I heard but runs good. The slowness is due to the programming. Its rated at 300hp and pulls like my 12v but it does the job.
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