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jkent
New User
Apr 6, 2014, 3:55 PM
Post #1 of 7
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1990 Pontiac Bonneville
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1990 pontiac bonneville 3.8 v-6. I have a check engine light on with a code 16 high system voltage. It is intermittent. Along with code engine idles high in park in neutral around 1,800-2,400 rpm. Any ideas where I can start?
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Hammer Time
Ultimate Carjunky
/ Moderator
Apr 6, 2014, 4:04 PM
Post #2 of 7
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Re: 1990 Pontiac Bonneville
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You'll need to monitor the battery voltage to determine if it really is going to high. You may have a bad alternator.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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jkent
New User
Apr 6, 2014, 4:07 PM
Post #3 of 7
(2152 views)
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Re: 1990 Pontiac Bonneville
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sorry, I fail to mention I already replaced the alternator
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Tom Greenleaf
Ultimate Carjunky
/ Moderator
Apr 6, 2014, 4:09 PM
Post #4 of 7
(2151 views)
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Re: 1990 Pontiac Bonneville
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Check it anyway newer or not voltage can't be allowed to spike,
T
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jkent
New User
Apr 6, 2014, 5:53 PM
Post #6 of 7
(2125 views)
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Re: 1990 Pontiac Bonneville
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sorry, I fail to mention I already replaced the alternator Did you replace it for this problem your having now?
Yes I did
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kev2
Veteran
Apr 8, 2014, 12:46 PM
Post #7 of 7
(2072 views)
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Re: 1990 Pontiac Bonneville
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maybe check the voltage at the back of alternator and battery- could be the system is not seeing correct battery voltage and commanding a high alt output.
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