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Unread 07-25-2010, 06:41 PM   #1
tjdriver
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Can a low or dying battery cause a low idle?

can a low battery or dieing battery make your vehicle idle low?

i'll explain if needed.

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Unread 07-25-2010, 06:45 PM   #2
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Unread 07-25-2010, 06:48 PM   #3
kuebelwagen
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I say yes. last week My bat went bad, rough idle, died at traffic lights, low cranking power. Put new batt in, problem fixxed!
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Unread 07-25-2010, 06:50 PM   #4
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Yes, the computer doesn't like low voltage and will lose idle settings.
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Unread 07-26-2010, 08:56 AM   #5
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Quote:
Originally Posted by 1jack5 View Post
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Unread 07-26-2010, 08:58 AM   #6
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Quote:
Originally Posted by kuebelwagen View Post
I say yes. last week My bat went bad, rough idle, died at traffic lights, low cranking power. Put new batt in, problem fixxed!
it runs fine above idle, but idle is at 200 rpms and when i rev it up and let off it idles down to nothing and dies out. that leads me to believe that the alt is putting plenty of juice for everything and making up for crappy bat.
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Unread 07-26-2010, 09:00 AM   #7
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it might be ur alternator not ur battery. My mustang was doing the same thing so I got a alternator test and the diodes were stuck open on the alternator draining the battery when the car was off.
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Unread 07-26-2010, 09:04 AM   #8
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good idea, but i don't think that's it. it's not really really sluggish on start up. just enough to notice. if the alt was bad wouldn't all the electrical not work well while driving it? i'm gonna check the voltage on the bat and see what's up.
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Unread 07-26-2010, 09:08 AM   #9
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if its stalling all the time at lights. try turning your ac on. it usually bumps the idle rpms a little bit. It has helped me in the past when i had a dieing battery.
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Unread 07-26-2010, 09:22 AM   #10
tjdriver
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it doesn't help. it will still idle real low and the compressor kicks on/off very fast.
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Unread 07-26-2010, 09:24 AM   #11
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Bring it down to autozone or advance and get your battery and alternator tested.
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Unread 07-26-2010, 09:34 AM   #12
skip11and1
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the alternator may still be working properly, just when you shut your jeep off it may drain your battery just enough. my mustang started up every time. sometimes hard sometime not. but it idled low and even lower with the a/c on. like landocomando said just bring it to one of the parts stores for a free test.
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Unread 07-26-2010, 09:36 AM   #13
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o i c
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Unread 07-26-2010, 09:36 AM   #14
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When the battery is low enough, the engine will barely idle and it can even stall. Have the battery load tested. The alternator depends on the battery to put out power so if the battery is dead or near dead, the alternator will be dead or near dead too.
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Unread 07-26-2010, 10:51 AM   #15
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thx jerr.
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