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1990 Pontiac Bonneville


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jkent
New User

Apr 6, 2014, 3:55 PM

Post #1 of 7 (2032 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 (2029 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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jkent
New User

Apr 6, 2014, 4:07 PM

Post #3 of 7 (2020 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 (2019 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 (1999 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?





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jkent
New User

Apr 6, 2014, 5:53 PM

Post #6 of 7 (1993 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 (1940 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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