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Old 03-27-2006, 02:41 PM   #1
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Default Gauges abnormal at idle (oil pressure and voltage)

Had originally posted in the 1992-1999 forum, but still no luck. Here'* my original thread in there: http://www.bonnevilleclub.com/forum/...ic.php?t=49096
Anyway, i kept a good eye on my voltage today and it went from around 14 then dropped to 7 or 8 in a matter of moments. Then it goes back up to 14 again. This only seems to take place at idle, otherwise it hovers around the normal 14. Could it be a bad alternator? or battery? Im about to get those tested to make sure. Any other ideas?
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Old 03-27-2006, 04:00 PM   #2
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Please go to Advance Auto or Autozone and have your charging system tested for free. That would be the best way to know about the alternator/battery.

Have you checked all your cables and connections?
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Old 04-05-2006, 06:36 PM   #3
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Got my alternator tested at autozone the other day, they said it came out perfectly normal. I recieved my scan tool the other day. Did a scan and the only code that showed up was P303: Cylinder 3 Misfire.
Here'* the freeze frame data:

Fuel System 1 status: Closed Loop
Calculated Load: 18.4%
Short Term Fuel Trim: -12.50%
Long Term Fuel Trim: 10.94%;
Intake Manifold Absolute Pressure: 19.4 inHg
Engine RPM: 1581
Air Flow Rate from MAF: 4.343 lb/min
Absolute Throttle Position : 11.37%
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Old 04-07-2006, 11:51 AM   #4
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Nevermind....
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Old 04-07-2006, 11:56 AM   #5
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Do you have an aftermarket stereo in there? GMs in general are known to come stock with just enough alternator to push the stock electronics. Someone a while back actually quoted or posted a link to the GM Bulletin telling dealers that voltmeter fluctuations are to be expected with aftermarket stereos.

Also, how old is your battery? If it'* getting weak, it'll have "dibs" on the juice your alt is putting out, thereby starving the rest of the systems.

Mine fluctuates a bit as well, by the way. It used to be really bad, but then I got a new battery...
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