DIC MPG Shenanigans
Thread Starter
Melting Slicks
Joined: May 2006
Posts: 2,820
Likes: 216
From: Deep in the Heart, TX
it MIGHT be a power problem, however it is not resetting to zero. it just takes random dips. The longer it has been since I reset it, the less significant of a dip. Like yesterday it went from 17.0 to 16.5 next time i turned the car on.
Drifting
Joined: Apr 2010
Posts: 1,578
Likes: 23
From: Waldorf, MD
m48xhp,
How's the weather in your neck of the woods? Any diverse temp variations? A lot of rain or anything? This problem might be related to components or construction of the "CPU" or the computer or central processor. It may depend on the quality of subcomponents that are being used in the CPU or elsewhere that are affected by temp differences or other factors. Many of these subcomponents in vehicles and other tools are sensitive to, well, stuff. Some years ago there were big fights over using these components in military aircaft because DoD wanted to use newer plastic encased microchips that had never been used before in military aircraft. These planes demand precision performance especially with ordnance on board and every bit of timing and programmimg must be exact. Previously used in aircraft were metalized microchips that cost more than you can imagine but were very reliable in adverse conditions. Some of the components used in autos are not as reliable and they are a lot less costly. To use metal ones in cars would drive the cost of cars up by thousands of dollars.
Be aware of environmental conditions, how hot the engine bay may be, etc. It seems in this case it happened after the car may have cooled down...on a hot day? Be aware and see if there is a pattern to the phenomenon.
Couple times the "Average MPG" number likes to take a random dip while the car is off. Happened again today. Went to Burger King, was at 19.5 mpg when we got there (been trying real hard to keep my foot out of it!), then when I start up again its down to 17.1 mpg. Car didnt move, was turned off, in reverse. Doesnt happen all the time just once a week maybe. And its not resetting it self, its just dipping down, as if it sat still for 30 minutes just burning fuel. im trying to track this tank manually to see what is up, but any ideas? im not leaking fuel, and i havnt noticed any problems with the odo.
Be aware of environmental conditions, how hot the engine bay may be, etc. It seems in this case it happened after the car may have cooled down...on a hot day? Be aware and see if there is a pattern to the phenomenon.
Thread Starter
Melting Slicks
Joined: May 2006
Posts: 2,820
Likes: 216
From: Deep in the Heart, TX
m48xhp,
How's the weather in your neck of the woods? Any diverse temp variations? A lot of rain or anything? This problem might be related to components or construction of the "CPU" or the computer or central processor. It may depend on the quality of subcomponents that are being used in the CPU or elsewhere that are affected by temp differences or other factors. Many of these subcomponents in vehicles and other tools are sensitive to, well, stuff. Some years ago there were big fights over using these components in military aircaft because DoD wanted to use newer plastic encased microchips that had never been used before in military aircraft. These planes demand precision performance especially with ordnance on board and every bit of timing and programmimg must be exact. Previously used in aircraft were metalized microchips that cost more than you can imagine but were very reliable in adverse conditions. Some of the components used in autos are not as reliable and they are a lot less costly. To use metal ones in cars would drive the cost of cars up by thousands of dollars.
Be aware of environmental conditions, how hot the engine bay may be, etc. It seems in this case it happened after the car may have cooled down...on a hot day? Be aware and see if there is a pattern to the phenomenon.
How's the weather in your neck of the woods? Any diverse temp variations? A lot of rain or anything? This problem might be related to components or construction of the "CPU" or the computer or central processor. It may depend on the quality of subcomponents that are being used in the CPU or elsewhere that are affected by temp differences or other factors. Many of these subcomponents in vehicles and other tools are sensitive to, well, stuff. Some years ago there were big fights over using these components in military aircaft because DoD wanted to use newer plastic encased microchips that had never been used before in military aircraft. These planes demand precision performance especially with ordnance on board and every bit of timing and programmimg must be exact. Previously used in aircraft were metalized microchips that cost more than you can imagine but were very reliable in adverse conditions. Some of the components used in autos are not as reliable and they are a lot less costly. To use metal ones in cars would drive the cost of cars up by thousands of dollars.
Be aware of environmental conditions, how hot the engine bay may be, etc. It seems in this case it happened after the car may have cooled down...on a hot day? Be aware and see if there is a pattern to the phenomenon.
I understand the mpg calculator comes from measurements of the injectors, so I assume it is either something with that.
Thread Starter
Melting Slicks
Joined: May 2006
Posts: 2,820
Likes: 216
From: Deep in the Heart, TX
update: finally finished that tank. got right at 18mpg using old fashioned math.
...but the plot thickens...
i go to a new chevron store to get some better gas (compared to Kroger). I fill it up, start it, go to reset my mpg and odo, and after i press the reset button, i get locked out of anything else. i cant reset the odo, i push all the DIC buttons and nothing happens. i pull over, shut down the car and see "SOFT: 7.5" show on the DIC. I thought that was weird. I started it back up and again, "SOFT: 7.5", then it said something like "EEFC: 0405" (not sure the exact letters/numbers), the guages swept and stuck at max for about 5 seconds. then went back. i was still locked out of the DIC buttons. So I start to drive home and try it again about minute later and everything works fine. weird stuff....so far i am getting 19.5 on this tank 22 or so miles in.
...but the plot thickens...
i go to a new chevron store to get some better gas (compared to Kroger). I fill it up, start it, go to reset my mpg and odo, and after i press the reset button, i get locked out of anything else. i cant reset the odo, i push all the DIC buttons and nothing happens. i pull over, shut down the car and see "SOFT: 7.5" show on the DIC. I thought that was weird. I started it back up and again, "SOFT: 7.5", then it said something like "EEFC: 0405" (not sure the exact letters/numbers), the guages swept and stuck at max for about 5 seconds. then went back. i was still locked out of the DIC buttons. So I start to drive home and try it again about minute later and everything works fine. weird stuff....so far i am getting 19.5 on this tank 22 or so miles in.
