Battery failing

1997 FORD EXPLORER
150,000 MILES • 6 CYL • AWD • AUTOMATIC
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KELLYB5280
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  • 2 POSTS
1997 ford explorer. Just changed brakes and wouldn't start. Took battery to Midas for recharge. Started perfectly but now when car is stopped like at a stop light the battery falls but as soon as you gas it, it goes back to middle. Any guesses?
Nov 16, 2010 at 7:55 AM
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JACOBANDNICKOLAS
  • ✓Experienced Mechanic
  • 110,248 POSTS
Alternator? have checked also load test battery Have the battery fully recharged again and have it load tested at a parts store to see if it holds up. Alsol, have the alternator tested. Unless the idle is really low, the alt should maintain a good charge.

Let me know what you find. Also, most part stores will check both for free.
Nov 16, 2010 at 8:28 AM
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MERLIN2021
  • ✓Experienced Mechanic
  • 17,250 POSTS
After the battery is disconnected, it takes several drive cycles for the computer(PCM) to relearn it's parameters, give it a week and see if corrects. Is the check engine light on?
Nov 16, 2010 at 8:32 AM
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KELLYB5280
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The check engine light is on. We had the engine replaced on the side last year. When I had it checked at auto zone they said it was the o2 sensor.
Nov 16, 2010 at 10:50 AM
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