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PostPosted: Sat Feb 10, 2018 11:07 pm 
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Joined: Wed Jan 24, 2018 9:36 pm
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Year and Trim: 2003 SE
I was pulling put of the drive thru the other night. I sat waiting to turn then I turn my heat on defrost and floor. Suddenly the voltage drops and engine starts to run roughly. When I turned it off it returned to normal. So I did it again and then it started the same problem. I left it on and fluctuated the speed of the blower then it eventually leveled out. Any ideas?

2003 Bonneville se


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PostPosted: Sun Feb 11, 2018 5:36 pm 
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Joined: Wed Jan 24, 2018 9:36 pm
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Year and Trim: 2003 SE
I did have a code come up a week ago for the catalytic converter and wheel speed sensor
But that's about it.


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PostPosted: Sun Feb 11, 2018 7:37 pm 
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Posts like an L67
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Joined: Sun Aug 22, 2010 11:11 pm
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Location: Ontario, Canada
Year and Trim: 2000 Bonniville SSEi L67
welcome to the club Pickles!!

I would first check the battery and alternator output. that happened to one of my W bodies that had a rewound alternator: the headlights would also

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2000 SSEi
past rides:
1996 SSEi
1992 GTP
1987 Grand Am


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PostPosted: Sun Feb 11, 2018 11:07 pm 
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Location: Chicago, IL
Year and Trim: 2003 SLE
Sounds like a weak alternator. I'd have the car tested at your nearest auto parts store, it's typically free.

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"Penelope" - 2003 SLE - 176k Miles
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PostPosted: Mon Feb 12, 2018 3:27 pm 
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I did just recently replace the battery. Thanks for the advice I will be checking the alternator asap. I can just do that myself right? Just check the charging output?

And thanks for the welcoming.


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PostPosted: Mon Feb 12, 2018 8:45 pm 
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Posts like an L67
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Year and Trim: 1993 SLE
1998 SE
2001 SSEI
2002 SSEI
If you have a multimeter, you can test charging system output AND , also very important check for failing diodes that are adding AC into your car's DC electrical system
http://content.amprobe.com/appnotes/AMP ... ppnote.pdf

Too much AC is bad because it messes with the way all your car's electronics , such as the computer, work.
It can burn out ignition control modules and other significant electrical items.


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