Question about 1999 Chevrolet Silverado 1500
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Posted on Jan 02, 2017
if it runs high when you first start it then mellows out,, theirs no problem , all of our chevys do that.... but if its sputtering or you hear a quiet popping noise check spark plugs
Posted on May 20, 2009
At idle the alt shows 12.5 ?
How about at 2000 RPM....does the voltage rise with increased engine speed?
If no increase in voltage with higher RPM........the alternator may be defective.
Remember....if battery is low and you add the load of all accessories the voltage may be low at idle speed until the battery is charged up.....this would be normal under this condition. Once the battery is charged the alt can handle the load of the accessories at idle and should be able to keep voltage up.
Also......a defective battery could be taking all the alt has got to give.....resulting in a low voltage reading.
We would like to see approx 14.5 volts when vehicle is running.
Posted on Sep 10, 2009
I had a 96 GMC 1500 with a 5.7 ltr. It would idle rough, especially on start up. After replacing everything under the sun, it turned out the ECM (computer) was shot. I found a used one and plugged it in and it ran fine. I think I paid 50 bucks or so for it. If you know someone with a truck like yours, plug theirs in and see if it fixes it.
Posted on Apr 19, 2010
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