1997 MUSTANG COBRA CHARGING & IDLE ISSUE

  • Tiny
  • pv420ny
  • 1997 Ford Mustang
  • V8
  • 2WD
  • manual
  • 78,000 miles

My 1997 Mustang Cobra has 78k miles. When tested, the alternator put out 130amps, the cars voltage was between 13.75 - 14.40, idle at 800. The battery isn't the best, was killed a couple times from sitting but passed a test.
After driving a few minutes I am getting a dip in the voltage gauge (The more accessories I turn on, the lower it goes), and when the car is at idle it becomes a little rough(bouncing between 775 - 815).
Car has a new IAC, no codes, no vac leaks(smoke tested), and no performance issues when driving. Can the battery be causing this?


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Sunday, June 19th, 2011 AT 1:45 AM

1 Reply

  • Tiny
  • rasmataz
  • Member

Could be a sulfated battery or the computer controlled of the alternator field generation circuit-

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Thursday, August 4th, 2011 AT 10:09 PM

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