Battery/Alternator Issues - Ford Mustang Forum
 
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post #1 of 6 (permalink) Old 08-20-2012 Thread Starter
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Battery/Alternator Issues

I recently changed the battery on my 2007 Mustang and after I installed it the car wouldn't remain running unless it was sitting still in neutral. Once you pulled up to a stop with the clutch engaged the car would die. Could this be the alternator?


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post #2 of 6 (permalink) Old 08-21-2012
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The ECU has to re-learn the idle strategy whenever the battery is replaced or disconnected. The erratic idle normally disappears after driving 20-50 miles. There's also a procedure in the battery maintenance section of the owner's manual that may expedite the re-learning process.

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post #3 of 6 (permalink) Old 08-22-2012
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Could be the alternator. How many miles does it have? I have an automatic and it was doing the same thing after a fresh battery. It would almost hesitate at stop and goes. Took it to O Reillys and they checked it with machine and there was barely enough power from the car to print out the report lol. He said yep, alternator was going. Happened at about 55k miles which I thought was early but he said no it's common. Ordered new one off American Muscle, easy install after belt is off and it runs great!

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post #4 of 6 (permalink) Old 08-22-2012 Thread Starter
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It's at 130,000 miles. The re-learning process I've been told about before, but when I changed the battery the previous time it never re-learned the idling. Before the battery was changed it would surge to 1500 drop to 250. It still does that someone said something about a throttle body, but at this point I'm fixing to take it to a local mechanic and just have him tell me everything that's wrong and I'll fix it myself.


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post #5 of 6 (permalink) Old 08-22-2012
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I'd try the idle process first - it's free. It's detailed in the manual as mentioned. A dirty throttle body is cheap/easy to fix as well. Might save you some $$ before taking it to a mechanic.
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post #6 of 6 (permalink) Old 08-23-2012
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Quote:
Originally Posted by everton992000 View Post
Before the battery was changed it would surge to 1500 drop to 250.
Unfortunately, you never mentioned that fact in your initial post, and I'm not a mind reader. Hence, my suggestion regarding the idle re-learning process was based on your lone input where you stated "...after I installed it(battery) the car wouldn't remain running unless it was sitting still in neutral."
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