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2010-2012 General Discussion General Chit Chat About the 6.7L 4th generation Cummins - NO ADVERTISING

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Old 07-25-2010, 11:03 AM   #1 (permalink)
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Maf p0101

After 300 miles of hauling a 3000lb overhead camper and pulling a 4000lb boat,getting 8-9 mpg, I got a MIL. A few days later,unloaded, I drove the 160 miles to my dealer and was getting 19.8 mpg on the evic. I thought, Fantastic, finally---
Dealer reset the code and said MAF sensor malfuncion, didn't say anything about cleaning it and couldn't even show me where it is. Typical
So I drive home and now I'm back to the normal 13-14 mpg.
What the heck is up with that
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Old 07-25-2010, 12:46 PM   #2 (permalink)
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Thats odd. Maybe you had a leak somewhere in the intake system. The maf isyour mass airflow sensor located in the intake
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Old 07-25-2010, 04:05 PM   #3 (permalink)
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Yes, I know. but why was my fuel mileage so much better with it malfunctioning? Does it work with the EGR? What would happen if they were both unplugged?
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Old 07-25-2010, 04:28 PM   #4 (permalink)
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Don't believe your engine would run well, if at all without the MAF sensor plugged in. Has to do with metering/monitoring air flow into the engine I believe. Sometimes you have problems with them if you add an after market air filter that is an oil bath type, such as a K&N filter, can cause them to get dirty and reek havoc with the way the engine runs...will throw codes at the very least. Don't know why your mpg got better...if you find out, let us know
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Old 07-25-2010, 11:54 PM   #5 (permalink)
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Well thats kinda tricky. Im wondering if the air flow was being read incorrectly and causeing the evic to read you the wrong calculated fuel mileage. The maf will make it run very poorly too if not there. If it was a gasengine it wouldnt run at all most likely. I cant give a direct answer since the ISB doesnt have a MAF and that what i get into. The maf sensor on a vt275 international wont make a huge difference on perfromance since its tied with egr so maybe it is on the cummins too
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Old 07-26-2010, 12:00 AM   #6 (permalink)
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Just looked on quickserve and found no cummins code to that so thats a dodge code
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Old 07-26-2010, 08:43 AM   #7 (permalink)
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I figured that it was just sending wrong info to the EVIC. I didn't hand calculate the mpg's, I just reported what the EVIC was telling me.
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