Question about 2005 Ford F 350 Super Duty

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I installed a new turbo back 4" exhaust and an AFE stage 2 intake with a PG7 oiled filter. Truck ran great and added MPG for the next two days. I filled up at my regular place thursday and we headed out for the weekend pulling a 39' fifth wheel loaded up and 6 is the truck. About 30 minutes out of town we stopped for an hour to eat and when we got back on the highway the truck started to run rough near the top of the first hill we came and we begain to lose power. After that the truck smoothed out and ran great for the next hour. The truck ran fine once at the lake with no pulling load. On the way back home today the truck started to run really rough about 10 minutes out on the highway and stumbled and lost power. It never got hot but ran rough on and off and we limped home running 45 to 50mph with very little power for any hills. Once home the truck is idling very rough. I added injector cleaner on the way home and checked the computer for codes but nothing ever came up. I also noticed the tubo never got above ~20 on teh way home even when the truck was running fine. Does this sound like bad fuel? fuel filter? water in the fuel? I was also wondering if the oiled air filter may have caused some plroblems with the mass air sensor and that may be towing the computer off? The truck runs rough like it has injectors plugged. I just need some help where to look first?

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  • Michael Woebbecke Apr 13, 2011

    The air flow sensor appeared to be clean of oil. I contacted the air intake manufacturer and they confirmed the oil they use for filter maintanence is manufatured specificly for this application and should not cause issues with the sensor and also if the filter were to be over oiled the oil used will not harm the sensor and can be cleaned of with electronic contact cleaner (this was a brand new factory oiled filter - one week in use). I cleaned the sensor with contact cleaner even though I did not see any oil built up on it. This made no change in the truck operation. I also unplugged the sensor completely and found that this made no change in the truck operation nor did it cause any codes to come up on the computer. Looking on the internet I found several blogs that had user comments noting programming changes ford has made to the computer that ignore input from ths sensor - not that you can believe much of what you read in the blogs but this was a common comment especially for 2005 year trucks). I reviewed the truck manual for fuel/water seperator and fuel filter locations and think this is probably the most likely point of interest ruling out the air intake sensor. I'm assuming the filters may be causing low fuel flow which would cause the stumbling and loss of power and would also lead the computer directing low turbo function to match the low fuel condition??? Does this approach make sense to you???



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I would definitely suspect oil contamination on the mass air flow sensor. It works by comparing the temperature of a heated platinum wire in the air stream with a reference. If the wire gets loaded up with oil, it will not be cooled at the proper rate, and will report a lower air flow rate than is actually going through. This will cause the computer to reduce the fuel flow, which would cause the engine to lag under load.

Inspect the air flow sensor element using a bright light. If you see a visible oil film, try removing it with electrical contact cleaner. Change back to a conventional filter, then let the engine idle for a few minutes to dry off the contact cleaner (the sensor wire will be hotter at low speed). In the worst case, you may have to replace the sensor.

Posted on Apr 11, 2011


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