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Old 11-22-2005, 02:54 PM   #1 (permalink)
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Default mpg bar graph

I recent drove a ten mile trip and experienced a false reading on the mpg display. It read only zero or 150mpg, nothing in between. The problem did not appear on the next or any subsequent trip since. Does anyone have any ideas on what caused this?
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Old 11-22-2005, 05:43 PM   #2 (permalink)
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Marc,

Others have reported this occasionally. Seams to be a software glitch that some say is because they started the car too fast. I don't think anyone has had it happen more than twice and most have never seen it. Anyway I doubt the car was actually getting 150 mpg so depending on how long it took to clear I would go with the gas guage for fillup vice the trusty FCD this time. Have fun, Rick
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Old 11-22-2005, 08:03 PM   #3 (permalink)
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I was going to post the very same thing as it happened to me on the way home from work today. This happened stopping at a red light and auto-stop didn't engage. I turned the ignition off and restarted when the light turned green. It stayed at 150 and didn't move until I stopped, turned the engine off, and restarted. It was fine the last 20 minutes going home.
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Old 11-22-2005, 10:47 PM   #4 (permalink)
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Its a "glitch" in the MPG "computer" I've seen it 3 times in my 02. Simply takes a "reboot" to fix. Key off, wait 3 seconds, restart.

Or go for broke and leave Rick Reece's MPG record in the dust :twisted:
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Old 11-24-2005, 12:32 AM   #5 (permalink)
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This has come up several times, but in some 40K miles I've never ever had this happen. Wounder if it's some specific sequence done at start up that no one realizes they're doing.
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Old 11-24-2005, 09:29 AM   #6 (permalink)
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Happens to me everytime I run out of gas. The next start and short trip afterwards will always show this behaviour. Only seems to be present in the new software, since pre-ECM replacement I never observed it.
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Old 11-24-2005, 11:06 AM   #7 (permalink)
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Quote:
Originally Posted by Rick
Wonder if it's some specific sequence done at start up that no one realizes they're doing.
It happened again yesterday just after leaving work, second day in a row. I stopped at a red light, and since the engine wasn't warmed up enough to auto-stop, I turned the key to"Accessory" or "On"(not sure which) just as I had done the day before to turn the engine off. After restarting, it went to 150mpg and stayed there till another red light when auto-stop engaged and the graph went to "0". After the red light, the graph didn't move, but the MPG continued to rise as if the graph were at 150. At the next red light, I turned the ignition completely off and restarted which fixed the problem. These were the first two times this has ever happened to the car. I have never really turned the engine off at red lights before until recently, so it must have something to do with that.
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Old 12-06-2005, 12:46 AM   #8 (permalink)
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Default Re: mpg bar graph

Quote:
Originally Posted by Marc Roberts
I recent drove a ten mile trip and experienced a false reading on the mpg display. It read only zero or 150mpg, nothing in between. The problem did not appear on the next or any subsequent trip since. Does anyone have any ideas on what caused this?
Greetings Marc,
It happened to me today I didnt notice it till I had gone some distance, 15mi or so, as the area was somewhat hilly and I was in traffic I wasnt paying that much attention to my FCD. It was only when I saw my assist at half and the FCD that I processed what had happend
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Old 01-02-2013, 09:56 AM   #9 (permalink)
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Default False sMPG and Bar Graph Reading

Resurrecting an old issue which is new to me. A glitch in the MPG calculation after you do a FAS. The Bar Graph was moving between zero and 150. Zero at stops and 150 when car in motion.

I was excited for a while until I figured out it wasn't for real.
But I got a cool screen saver for my phone now.
Attached Images
File Type: jpg fcd.jpg (22.3 KB, 53 views)
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Old 01-02-2013, 03:46 PM   #10 (permalink)
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I've had it happen a dozen or so times and it was always after using the ignition to do a FAS. Since I've installed my injector interrupt switch to initiate a FAS, I haven't had it happen again.

freezin4, I've had a couple of times that I had the FCD maxed out for about 15 miles or so and it was actual; I had to switch to metric to see what I got on those trips. One of them was 1.2L/100km.
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