Question about 1999 Buick LeSabre

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Fluctuating battery voltage

Like many who have posted, the security light on my '99 LeSabre stays on. Wondering if another problem is related to this.....It seems like as I drive and come to a stop (apply the brake), the battery voltage will occasionally drop and the car begins to run rough. The problem is worse when I have the fan on, and worse yet in wet weather. The car has lost power in the past from this, but usually the needle on the dash showing battery voltage just moves back until I accelerate, and then it returns to normal.

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6 Suggested Answers

6ya6ya
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Posted on Jan 02, 2017

  • 1 Answer

SOURCE: 1995 Buick LeSabre won't start when security light comes on.

When my 1994 LaSabre had a problem recognizing the chip in the key (due to the contacts in the lock not working), I managed to bypass the system by locating the two wires (clear tube with two smaller wires in it exiting the steerin column, unlike any other wiring), cutting the cable, and soldering a resistor across the two wires that go to the hidden module thet in turn controlls the starter and sends a signal to the engine computer. Use a resistor of the same resistamce value as in one of the keys for the car (measure resistors with a digital meter). There are a dozen or so values used. You loose the extra protection of the chip, but the fix is low cost.
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Posted on Jul 23, 2008

jigsawbill
  • 398 Answers

SOURCE: 1995 Buick LeSabre Engine Light

Autozone will run a scan on your car for nothing and give you codes and possible solutions.

Posted on Aug 23, 2008

fastboyz
  • 674 Answers

SOURCE: rough idle

fuel filters rarley cause idle problems. i would look at the egr valve or possible vaccume leaks.

Posted on Aug 24, 2008

  • 27 Answers

SOURCE: security light stays on

First place to check would be a fuse.  See if there is one labled security or alarm.  If there is try changing that.

Posted on Sep 20, 2008

  • 1 Answer

SOURCE: Running rough and stalls during wet weather otherwise runs fine.

Your ignition coil is cracked. Replace it with a new OEM unit.

Posted on Jan 12, 2009

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