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When you disconnect the battery for 15 minutes or so... we all know that the ECM resets, right? Good....

Now for the interesting part... :mrgreen:

ECM's, unlike a lightening speed desktop computer, are a BLAZING 8MHz!!! :shock:

IT take the average ECM about 20 minutes to reboot itself....

So by starting the vehicle IMMEDIATELY after reconnecting the battery, you have just screwed the setup of the computer and goes by what has been rebooted to that point.... no codes will show or anything, but you may be hindering the ultimate performance of your vehicle by doing so, even if it runs great....

I gained 2-3mpg by letting my burb reset for 30 minutes prior to startup.... seems to be legit... I did nothing else but diconnect the battery and reconnect it and let it sit....

This should be on Ripley's Believe it or NOT!!!! :thumb:
 

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Going Postal
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Now thats interesting news. I have to pop the battery on my '92 dually to get the AC to reset(stupid switch) and lost some mileage. I'll have to do it again today. I went from better than 12 to around 9 to 10 for no reason that I could find.



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I'm in the same boat, ever since I had my engine problems, my gas milage went to HECK in a hand bag. I didn't know this and it explains alot. I will for sure try this and see if it makes a differance. It might also explain why my "Fix Engine" light won't go off. If I haven't reset the ECM, it probably thinks that the problem hasn't been fixed yet. :?
 

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Going Postal
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I think it works. I'll have to go through another tank to make sure, but I have gone much further on this tank than usual.



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I did this and am now averaging over 4 mpg better than before... Your a life saver Todd, thanks for the heads up...
 
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