Unplugged battery now weird

[FordLife]

So I just unplugged the negative on the battery to install an intake spacer and now my car runs, sounds completely different. I bout it used with 14k miles on it. Could it have had a tune that I just erased? Honestly not that fun to drive as it was before. Any ideas? It has a roush cold air, roush axle back exhaust.

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[codemanstang]

just give your car time to relearn its idle n parameters. usually takes a bit of driving for it to get back to where it was.

 

[FordLife]

Will it bring back the sound it had before aswell?

 

[codemanstang]

Will it bring back the sound it had before aswell?

Yes it will just the car learning the fuel trim etc. It's normal stuff.

On Mazda's they were really finicky if you didn't let the car idle for 10 min and then another 10 with the AC on then another ten min idle. Never pressing the throttle then it would learn the idle otherwise that rpm would bounce around at idle. Thankfully the 5.0 isn't that sensitive you can pretty much just go drive it after you pull the negative but I wouldn't beat it too hard first ten or so miles. It'll all be back to normal shortly

 

[Lonmon]

My advice would be to take off that intake spacer. I don't believe they have ever been proven to make any power and it may be throwing something off. After a battery reset there is some learning related to fine trim of air fuels but I have never experienced any power loss or laziness from it. Whenever you load a tune it resets everything and I have logged immediately after that with no drivability/idle issues. Also you can't delete a tune from a battery reset, you would need to reflash the pcm with a stock or different tune for it to change.

 

[codemanstang]

i just saw that "intake spacer"
Id pull that off and return it to auto zone

 

[FordLife]

Yes it will just the car learning the fuel trim etc. It's normal stuff.

On Mazda's they were really finicky if you didn't let the car idle for 10 min and then another 10 with the AC on then another ten min idle. Never pressing the throttle then it would learn the idle otherwise that rpm would bounce around at idle. Thankfully the 5.0 isn't that sensitive you can pretty much just go drive it after you pull the negative but I wouldn't beat it too hard first ten or so miles. It'll all be back to normal shortly

I did not know that thanks for the info, very informative.

 

[FordLife]

My advice would be to take off that intake spacer. I don't believe they have ever been proven to make any power and it may be throwing something off. After a battery reset there is some learning related to fine trim of air fuels but I have never experienced any power loss or laziness from it. Whenever you load a tune it resets everything and I have logged immediately after that with no drivability/idle issues. Also you can't delete a tune from a battery reset, you would need to reflash the pcm with a stock or different tune for it to change.

Yea I had taken it back off 1 hour after installing it. I really didn't like the way it made the intake sound. I do know there is some kind of Roush tune for the performance pac stage 2 Roush has so I wasnt sure if maybe that tune had been installed from the previous owner or not, which doesn't matter since the computer reset wouldn't effect that. Thank you for the info. I actually had an appointment I setup today to have Ford check it out. Guess I should cancel it

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