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All the mods mentioned above were installed with the battery cable connected, and my gas mileage has plummeted ever since. The needle moves very fast and is no where near where it was from factory. Am I missing something? Do I need to reset the ECU for it to "learn" the new upgrades? Please advise...

Thanks,
XG

 
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it will fighure it out after some driving. but reseting it will make it learn faster.
reset the ecu and let it idle for 5 minutes or so. then drive it around.

 
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yea... cause if anything you should gain 1-2 mpg or so from those mods. our stock exhaust is rediculously restrictive. reset it and you should be fine.

 
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this is prolly a stupid question,but how do you reset the ecu?

 
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under the hood, take off the fuse box cover and pull the ecu fuse for a minute or so.

 
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thats it? seems pretty simple, thanks.

 
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or disconnect the neg. batt connection....02

 
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That's what I would do....

 
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i thought all the fuel maps were hard copy in the ecu? And the reset was only for idle learn.

 
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thats what i thought too, but i have also heard that you can reset the ecu to try and get a little more power and beter feul mileage

 
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The hard fuel tables are only at WOT I think which is open loop mode(?)

 
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Well, it's not really a hard table, think of it as a 3D graph. The ECU must know three things, it will plug those into an equation and out pops the A/F ratio. It can adjust the A/F and I think ignintion (not sure about the 7thgen civic on the ignition though). What can happen with all these mods, is sometimes you can send a sensor off on some weird loop and resetting it usually the easy way to fix it.

You may want to check to make sure all the sensors you've moved are okay visually too. The CAI can sometimes screw with the thermocouple so the car can not see what the inlet temp really is. May want to look at that, then check the O2 sensors.

If a reflash doesn't work and all the sensors look okay, take it to AutoZone or something and have them plug it up to a computer and look for weird readings. I had an O2 sensor on my old truck once that was reading really high numbers, but since it was reading high numbers, the ECU didn't think it was bad, instead it though the engine was running lean and started dumping more fuel into the engine. Changed the O2 sensor and all was fine.

Hope that helps

 
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But then you have to reprogram the radio

 
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good explanation +1

 
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try kicking it?

 
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THat works... I also like to crank it with the fuse pulled... Lets me know its reset.

 
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Thanks I have some Electrical Engineering friends that work on HVAC systems on cars... That's how I know