Changed battery, now odd starting problems

Joined
Jan 18, 2003
Messages
320
Location
Dallas, TX
So I finally had to change my battery in my pickup (2005 Dodge Dakota, 3.7L V6, auto transmission). Through some quirk of manufacturing, this particular battery lasted six years, rather than the usual 3 or so that they seem to last here in Texas. For the past few months it had been starting harder than usual, but I figured it was just the battery getting old.

I took the old battery in, got it tested, it was definitely bad, and got a new one at Autozone. A Durastart Platinum EFB, size 65, if that makes a difference.

I installed the new battery, and now it doesn't want to start unless I give it a bump of the gas pedal. It turns over just fine- the battery is definitely good. But it's acting like it's not getting gas or air- when I give it a tap of the gas pedal, it starts right up and stays running. It idles a bit rough from time to time, but that's getting better as the ECU relearns it settings (or so I surmise).

What could be the issue here? I'm at a loss for what would be fine for starting with a mostly dead battery, and then NOT work with a brand new one with a lot more oomph.
 
Joined
Aug 20, 2003
Messages
18,951
Location
NE,Ohio
I dont know your specific application but generally it has to relearn all the idle parameters etc. might be something sticking or crudded up that it was compensating for previously.
 
Joined
Dec 28, 2011
Messages
650
Location
key largo,fl
This is why we always use an OBD2 connector powering the computer when swapping batteries

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Joined
Sep 17, 2002
Messages
5,465
Location
Lakeville, MN
As noted by others, you likely lost the preset conditions the computer had learned over time...

Check your manual - there may be an idle relearn proceedure... As I recall my vehicles typically were let it idle for a few minutes, then let it idle with the A/C on max for a few minutes more. Otherwise it will just take it a while to get better.
 

mark pruett

Thread starter
Joined
Jan 18, 2003
Messages
320
Location
Dallas, TX
Sure enough, that did the trick. I let it idle for a while, and drove it around on all the errands for the past few days, and it's starting up just fine without needing to touch the gas pedal now.
 
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