COBRA CHARGING & IDLE ISSUE

1997 Ford Mustang

Tiny

pv420ny

June, 19, 2011 AT 1:45 AM

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?


FOUND 68 RELATED QUESTIONS

1 Answer

Tiny

rasmataz

August, 4, 2011 AT 10:09 PM

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

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