Disconnected Battery now runs rough - Mustang Evolution

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Old 08-01-2013, 08:03 PM   #1
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Disconnected Battery now runs rough

I installed a new cold air intake this afternoon, and everything was fine. Then i got a check engine light, and i read that if you disconnect the negative cable from the battery for like 30 minutes, it resets everything. So i did that and when i reconnected the battery and took her for a spin, every time i hit the gas, she would run real rough for a second then would roughly start driving. Any ideas what happened?
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Old 08-01-2013, 08:16 PM   #2
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You may need a tune. Disconnecting the battery resets all of the learned stuff in your ECU memory, so it relearns idle and fuel curves based on your driving and ambient conditions.
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Old 08-01-2013, 08:17 PM   #3
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Quote:
Originally Posted by bradh2414 View Post
I installed a new cold air intake this afternoon, and everything was fine. Then i got a check engine light, and i read that if you disconnect the negative cable from the battery for like 30 minutes, it resets everything. So i did that and when i reconnected the battery and took her for a spin, every time i hit the gas, she would run real rough for a second then would roughly start driving. Any ideas what happened?
Might have some carbon build up or something that the fuel trims have adapted to and when your reset everything, it thinks that it's a new engine.
But I could be wrong. That's what I learned in school haha
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Old 08-01-2013, 08:17 PM   #4
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So how long will it do the sputtering/rough driving?
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Old 08-01-2013, 08:17 PM   #5
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^ well said.

How long did u drive it?
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Old 08-01-2013, 08:21 PM   #6
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just out and around the block. its really loud, and i couldnt control how smooth it ran so i didnt wanna wake up all my neighbors
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Old 08-01-2013, 08:24 PM   #7
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Ok, so you're going to want to idle for like 2 minutes with no lights, radio or ac. Then 2 minutes with ac blasting and radio on. Also drive around for like 30 min, some normal driving and some pedal to the metal driving. That might help
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Old 08-01-2013, 08:31 PM   #8
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okay ill give it a try. i just wasnt sure if something went wrong or if the ecu needed to reboot or whatever
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Old 08-01-2013, 08:34 PM   #9
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It'll take ur car a while to adjust brother as long as there are no other issues going on. My brothers in here are dead on it. Great help guys. That's why I love this forum.
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Old 08-01-2013, 08:40 PM   #10
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thanks everyone. this is why this site is awesome. i posted the same thing on allfordmustangs and didnt get a response. you guys already solved my problem haha
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