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1990 Pontiac Bonneville

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jkent
New User

Apr 6, 2014, 3:55 PM

Post #1 of 7 (2237 views)
1990 Pontiac Bonneville Sign In
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?


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Apr 6, 2014, 4:04 PM

Post #2 of 7 (2234 views)
Re: 1990 Pontiac Bonneville Sign In
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.



jkent
New User

Apr 6, 2014, 4:07 PM

Post #3 of 7 (2225 views)
Re: 1990 Pontiac Bonneville Sign In
sorry, I fail to mention I already replaced the alternator


Tom Greenleaf
Ultimate Carjunky / Moderator
Tom Greenleaf profile image

Apr 6, 2014, 4:09 PM

Post #4 of 7 (2224 views)
Re: 1990 Pontiac Bonneville Sign In
Check it anyway newer or not voltage can't be allowed to spike,


T



Discretesignals
Ultimate Carjunky / Moderator
Discretesignals profile image

Apr 6, 2014, 5:30 PM

Post #5 of 7 (2204 views)
Re: 1990 Pontiac Bonneville Sign In
Quote
sorry, I fail to mention I already replaced the alternator
Did you replace it for this problem your having now?





Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.


jkent
New User

Apr 6, 2014, 5:53 PM

Post #6 of 7 (2198 views)
Re: 1990 Pontiac Bonneville Sign In
In Reply To
Quote
sorry, I fail to mention I already replaced the alternator
Did you replace it for this problem your having now?
Yes I did


kev2
Veteran
kev2 profile image

Apr 8, 2014, 12:46 PM

Post #7 of 7 (2145 views)
Re: 1990 Pontiac Bonneville Sign In
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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