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  #1  
Old 09-05-2011, 10:54 PM
TBallentine TBallentine is offline
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Default p0068 code after fueling up

Bought my 2004 Ram 1500 4.7l as-is (no manufacturers warranty left )

Left the car lot with a 1/4 tank of gas and went to dinner with my wife, about 30 minutes drive to restaurant. Truck ran smooth as silk. After dinner, stopped at my usual gas station and filled up. About a mile up the road from fueling, the truck started losing power, running more and more erratic. Even sounded horrible like I had lost all the oil. The harder I pushed the gas pedal, the worse it got. I found I could ease into it but still bad. Got pulled over and it kept trying to stall out, idling hard, shaking.

I got it pulled home and checked error codes (key on/off 3 times etc...) and got p0068.

I got no clue where to even begin. Any advice is welcome.

--When I tried to crank it the next day it took forever and still idles rough, bogging down to around 500 rpm then surging to about 1500 with CEL on when this happens.

TIA!
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  #2  
Old 09-06-2011, 03:05 AM
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It's complaining about a discrepancy between the TP (Throttle Position) sensor, and the information from the MAF (Mass Air Flow) sensor. Although not related to fueling up, I've seen some pretty strange things happen, so to rule it out, check your gas cap to make sure it's tight and that there is nothing stopping it from making a good seal. I only suggest this as you had just filled up, so it's worth checking.

After that, I'd check to make sure the TP is seated properly.
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Old 09-06-2011, 11:38 AM
TBallentine TBallentine is offline
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Default

Thanks for answering Brad.

Checked gas cap - tight and sealed well.

TPS is seated good and I unplugged and cleaned contacts on both the TPS and MAP sensors. Still run like crap.

There is a new symptom now though. When idling in park, after a minute or so the "check gauges" light comes on and the oil pressure gauge drops to zero. When I restart, oil pressure seems fine for a minute then same thing happens. There is not a new code, just the same p0068 as before.

TIA
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Old 09-06-2011, 12:09 PM
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Just for clarification your truck does not have a mass airflow senosr(MAF), it has a manifold absolute pressure sensor(MAP). Anyway according to that code it is like he said above, a discrepancy between the two sensors. Looks like it could be one of the following problems: dirty TB, vacuum leak, poor electrical connection at TPS or MAP sensor, improperly seated TPS, faulty TPS, faulty MAP sensor. You may try buying a used TPS or MAP at a junk yard for cheap to try and resolve the problem (if you can't find a vacuum leak and TB is clean...)
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Old 09-06-2011, 07:39 PM
TBallentine TBallentine is offline
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Update:

Cleaned out throttle body (as best as I could). Reset codes by disconnecting battery for a few minutes. Seems to be running better although still a little rough idling, but still hardly any power when under load. At least the p0068 code isnt popping up anymore...yet that is.

I'm going to drop oil pan next and see if there is any sludge built up that might have pickup tube screen clogged. I dont really want to run it or drive it much until I do.

Stay tuned...
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  #6  
Old 09-06-2011, 08:12 PM
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good idea, might be able to run a bunch of seafoam through the oil to clean it out...
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Old 09-08-2011, 02:22 AM
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Seafoam is one of the best products to get these problems solved.
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Old 09-08-2011, 08:03 PM
02Ram4x4 02Ram4x4 is offline
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ill second that i have used seafoam so many times and have loved the results everytime!!!!!
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Old 09-15-2011, 07:19 PM
TBallentine TBallentine is offline
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Default

OK, as it turns out(so far) no fuel pressure. At this point it's now in the shop.

They replaced fuel pump and filter, MAP sensor (TPS was fine) but still runs like sh*t.

Factory trained techs at the Dodge dealership now spouting a lot of BS. I think they just dont have a clue. I'm seriously considering having it towed to another shop if they dont figure it out soon.

I mean, come on! They are pros, right?!?
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Old 09-16-2011, 12:03 AM
BigHorn4x4 BigHorn4x4 is offline
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what does the sea foam do? how to you use it, meaning where do you pore it in? ive herd others use this, not having problems but htink it might be good to use it, anyone please let me know!! thanks Rob
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