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Resetting the computer...03 5.7

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  #11  
Old 02-07-2008, 11:42 PM
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Default RE: Resetting the computer...03 5.7

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ORIGINAL: slideways

I have put two tanks of fuel (89 oct) through my 03 and have driven like a grandmother and im still getting 12mpg. This is basically not good for me since my lifted 90 Cherokee was getting 15. I installed an AEM intake which i wanted anyway but with only 40k on what appears to be a very well kept truck i was hoping to get better mpg.. On my Jeeps you can reset the computer by disconnecting the battery for either overnight or turning the key forward a few times like you were going to start it dead. I tried that on the Ram and i didnt even lose my radio presets.. so im assuming that didnt work. Im hoping to reset it so the computer caters to my driving style and the intake to get me some better mileage.

Thanks for the help.. and any other fuel suggestions.
Have you tried disconnecting the battery? Have you consulted the manual? (you know the book thats brand new in your glove box)
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  #12  
Old 02-08-2008, 07:22 AM
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Default RE: Resetting the computer...03 5.7

Pull the "PCM" fuse. I think it's 19, but I'm definitely NOT sure. Get in the truck, close the door and fasten your seatbelt (this is to get the chime to shut up). Turn the key on. You'll get various chimes and lights will come on and go off. After all that settles down (30 sec. or so), turn the key off. Reconnect the fuse (make sure you put it back where it was!!!!), and drive. If it doesn't start DON'T PANIC! You probably just put the fuse in the wrong slot.
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Old 02-08-2008, 08:33 AM
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Default RE: Resetting the computer...03 5.7

Ok thanks i'll try that. I did disconnect the battery like i said above.. nothing happened. I read the owners manual when i got the truck but dont recall anything about resetting the computer in there. I doubt Dodge wants people screwing around with their electrical systems anyway.

Why would a SWB get worse mileage? The only thing hurting me is the 4x4 which is part time anyway.
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Old 02-08-2008, 09:02 AM
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Default RE: Resetting the computer...03 5.7

What do you expect it to do? Engines are not run on Windows; they don't need scheduled reboots. There's no "gas mileage" flag in the code that'll get set to "good" after a restart.

The ECM is constantly adapting, thousands of times a second. Clearing it simply sets everything to "average" and it'll start correcting itself to the exact state it's in now.

If you want to improve mileage I'd start with a good tuneup. I get 9.5 mpg in town and I know exactly why -- I love the gas pedal, and I've got 55k on the stock plugs & wires. I haven't checked the EGR valve yet. There are a lot of little things to bring back into shape.
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Old 02-08-2008, 01:20 PM
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Default RE: Resetting the computer...03 5.7

Change the plugs is the only suggestion I have. However, I would imagine 12mpg is pretty good around town with a 4x4 seeings how my 4x2 averages between 12 - 13 in town. It's a cold hard fact that all us Ram owners eventually have to deal with, some of us understand right away, and others it takes some getting used to, however we all get crappy gas mileage (even the guys that SWEAR they're getting over 20mpg in their Hemi's, please)

It takes a lot of power to push your 6,000 lb beast around, the power is produced by burning gasoline, sorry...

And don't feel like you're getting raped just because you bought a Ram. I have a friend with a new Tundra averaging about 14mpg 50/50 city/highway. I've got another friend with a new F150 averaging 13mpg 30/70 city highway. I average about 17mpg with 20/80 city/highway driving. If you want a full size truck, you pay to fill that full size tank...
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Old 02-08-2008, 03:34 PM
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Default RE: Resetting the computer...03 5.7

Quote:
ORIGINAL: slideways

Ok thanks i'll try that. I did disconnect the battery like i said above.. nothing happened. I read the owners manual when i got the truck but dont recall anything about resetting the computer in there. I doubt Dodge wants people screwing around with their electrical systems anyway.

Why would a SWB get worse mileage? The only thing hurting me is the 4x4 which is part time anyway.
You are correct -- Dodge would rather you didn't fool with that stuff. Your 4x4 might be part time, but the extra weight is full-time.
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Old 02-08-2008, 04:52 PM
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Default RE: Resetting the computer...03 5.7

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You are correct -- Dodge would rather you didn't fool with that stuff. Your 4x4 might be part time, but the extra weight is full-time.
Very true.

You can always get an Edge Programmer. The Economy mode really helps you get about 1 - 2 mpg more. Exhaust and intake help a tiny tiny bit.
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Old 02-09-2008, 12:09 AM
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Default RE: Resetting the computer...03 5.7

To reset the computer you need to disconnect the battery for about 15 minutes should do it. Then your computer will be in re-learn mode. While it's in re-learn mode it will burn a little more fuel. (Your mpg will go down). To see if your truck is still in re-learn mode, turm the key to on and wait about 10 seconds. If the check engine light starts to flash then you are still in re-learn mode. If it stays solid then it is in normal mode.
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Old 02-11-2008, 05:19 PM
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Default RE: Resetting the computer...03 5.7

Thanks for the experienced advice. I disco'd my battery for a while today and the CEL blinks. Tommorow i'll start taking it easy to help the ECU learn my elderly style
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Old 02-11-2008, 05:19 PM
 
 
 
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