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Old 08-08-2012, 03:46 PM
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dash MPG going berzerk

Evening gentlemen, this is my first of many post i hope. I have a 06 PSD 350.
Today i stopped to put a lil fuel in my truck , the dash said i had 51 miles to E, and that i was getting 18 mpg.. now the MPG has been steady 16-18 since i got the truck 4 months ago. I drop 20$ in the tank just get get home and to a different station. I start up and drive about 2 miles and my gas gauge doesnt move AT ALL .. and my dash still reads 50 to E and 18 MPG .. i pull over and restart the tryuck and press the reset button and info buttons. SUDDENLY im gettin 99.9 MPG .. 2.0 MPG,18mph,0.0mpg,28.0MPG etc etc . Its all over the place .. i power down and reset the gauge to a solid 0.0 and drive home now on my 5 mile ride home i get back to about 14 mpg but its steady climb and then a steady drop between lights .. if i idle it plummets. I just parked it at 12.1 mph.
I am a bit confused as to whats going on, It now reads that i DID infact fuel up and brought me to 110 to E. SO TWO BIG questions, what the heck is going on AND how come for 4 months the MPG never really moved unless i was on the HW and getting good mileage and now its all over the place? Any insight AT all would be greatly appreciated , thanks alot
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Old 08-08-2012, 04:24 PM
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Originally Posted by nokodopa View Post
Evening gentlemen, this is my first of many post i hope. I have a 06 PSD 350.
Today i stopped to put a lil fuel in my truck , the dash said i had 51 miles to E, and that i was getting 18 mpg.. now the MPG has been steady 16-18 since i got the truck 4 months ago. I drop 20$ in the tank just get get home and to a different station. I start up and drive about 2 miles and my gas gauge doesnt move AT ALL .. and my dash still reads 50 to E and 18 MPG .. i pull over and restart the tryuck and press the reset button and info buttons. SUDDENLY im gettin 99.9 MPG .. 2.0 MPG,18mph,0.0mpg,28.0MPG etc etc . Its all over the place .. i power down and reset the gauge to a solid 0.0 and drive home now on my 5 mile ride home i get back to about 14 mpg but its steady climb and then a steady drop between lights .. if i idle it plummets. I just parked it at 12.1 mph.
I am a bit confused as to whats going on, It now reads that i DID infact fuel up and brought me to 110 to E. SO TWO BIG questions, what the heck is going on AND how come for 4 months the MPG never really moved unless i was on the HW and getting good mileage and now its all over the place? Any insight AT all would be greatly appreciated , thanks alot
I don't really have an answer for you, other than this happened now and again when I had a 6.4. It would do all sorts of haywire things and then go back to normal like nothing happened. There were a couple times where it woud literally start counting down the 50 miles to E a mile every 2 seconds or so when I was driving down the road. Funny thing is when it did that I always made it to the station in time before it reache 0 miles to E, but I always wondered if the truck would shut down if it hit 0 to E.
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Old 08-08-2012, 04:39 PM
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thanks , that actually makes me feel alot better .. there is a bunch of " thinkgs " im learning about the 6.0's ... not all are great .. so i was alarmed but knowing that it does happen and resets itself is a lil reassuring
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Old 08-08-2012, 04:44 PM
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Originally Posted by nokodopa View Post
thanks , that actually makes me feel alot better .. there is a bunch of " thinkgs " im learning about the 6.0's ... not all are great .. so i was alarmed but knowing that it does happen and resets itself is a lil reassuring
Yeah, give it a bit to see if it corrects itself. In the 6.4 I chalked it up to it trying to calculate while in regen mode pouring fuel down the exhaust to burn out the DPF. But in reality it's probably just a glitch.
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Old 08-08-2012, 05:10 PM
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Originally Posted by Boozer76 View Post
I don't really have an answer for you, other than this happened now and again when I had a 6.4. It would do all sorts of haywire things and then go back to normal like nothing happened. There were a couple times where it woud literally start counting down the 50 miles to E a mile every 2 seconds or so when I was driving down the road. Funny thing is when it did that I always made it to the station in time before it reache 0 miles to E, but I always wondered if the truck would shut down if it hit 0 to E.
it wont shut down but youll probably want clean underwear


Sent from my Autoguide iPhone app
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Old 08-09-2012, 08:08 AM
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Part of the problem is that the liar gauge is just an average reading, and with little to no timebase to average it goes wonky from the math used to calculate the average and the variables it uses to calculate. Seriously, you should just ignore it completely - I have my engine hours on my dash since I do all of my engine maintenance based on hours instead of miles.

As for the DTE(est) that's also untrustworthy at best. Your safest bet would be to always keep at least a quarter of a tank in your truck, because when it gets below that it goes into economy tuning which (from what I've read) tends to ruin injectors.
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