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2004 Pontiac Grand Prix Try Figuring This One Out


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fullstringer
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Mar 4, 2012, 3:59 PM

Post #1 of 10 (6404 views)
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Alright guys my wife has a 2004 Pontiac Grand Prix. It has around 130K on a 3.8 6 cylinder with the super charger. Recently we replaced the Intake Gasket because we were losing antifreeze often. This fixed that problem and car had been running great for the last month up until a week ago. It occasionally lost power when slowing down or coming to a stop and bogged down like it was about to stall. I figured the Alternator was about to go so I figured I'll drive it till it goes. Well I was driving it home from work the other night and it happened said charging system failure and died. Then it got crazy when I tried starting it back up it gave me a low oil pressure error code and died again. On the third attempt I got the same code and it started to knock badly. I immediately shut it off and pulled it home. While there I changed the oil found level was well and no metal in it. I then started it up and went around the block everything was fine until I got home. It started running rough again as if losing power so I turned high beams on, blower motor, windshield wipers , blinkers, etc. to put it under load. It flashed up charging system failure and volts jumped arround on meter from 11 to 15 and it finally died. I assumed it was the alternator and ordered a new one. Installed it and it acted fine until it warmed up then it started acting up again. After warm it says low oil pressure charging system failure and knocks between 2000 and 3000rpm. Beyond or below those it is fine. It throws 02 sensor bank 1 bad on for the service engine light when plugged into scanner. Any thoughts or help is appreciated.


Discretesignals
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Mar 4, 2012, 7:23 PM

Post #2 of 10 (6344 views)
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What is the charging system voltage when all of this is going on? You should have the battery and alternator tested. Inspect the battery connections. Battery acid leaking out of the battery can etch cables and connections and cause excessive resistance that chokes off current to those loads that demand it. Low voltage conditions will cause all kinds of weird electrical problems such as low fuel pressure because the electric fuel pump is turning too slow. The PCM may be flaking out and getting strange voltage readings from sensors because of a low voltage situation causing screwy outputs. Get the charging system inspected.





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

(This post was edited by Discretesignals on Mar 4, 2012, 7:25 PM)


fullstringer
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Mar 6, 2012, 10:35 PM

Post #3 of 10 (6295 views)
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Battery and alternator both tested good and connections all look good.


nickwarner
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Mar 6, 2012, 11:31 PM

Post #4 of 10 (6292 views)
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You keep getting warnings that you have low oil pressure but I see no mention that you have checked it with anything but the factory gauge. I'd get a real close look with a verified test gauge before I would fire this thing up again. Also, by the connections looking good do you mean you haven't touched them but they aren't growing fur or do you mean you have unbolted them to find them shiny and perfect? Thats what DS meant when he asked about the connections and for good reason.


Discretesignals
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Mar 7, 2012, 7:47 AM

Post #5 of 10 (6279 views)
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Did you have the alternator bench tested or was it tested on the vehicle when the problem was occurring?





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


techforfree
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Mar 7, 2012, 8:49 PM

Post #6 of 10 (6265 views)
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In Reply To
Alright guys my wife has a 2004 Pontiac Grand Prix. It has around 130K on a 3.8 6 cylinder with the super charger. Recently we replaced the Intake Gasket because we were losing antifreeze often. This fixed that problem and car had been running great for the last month up until a week ago. It occasionally lost power when slowing down or coming to a stop and bogged down like it was about to stall. I figured the Alternator was about to go so I figured I'll drive it till it goes. Well I was driving it home from work the other night and it happened said charging system failure and died. Then it got crazy when I tried starting it back up it gave me a low oil pressure error code and died again. On the third attempt I got the same code and it started to knock badly. I immediately shut it off and pulled it home. While there I changed the oil found level was well and no metal in it. I then started it up and went around the block everything was fine until I got home. It started running rough again as if losing power so I turned high beams on, blower motor, windshield wipers , blinkers, etc. to put it under load. It flashed up charging system failure and volts jumped arround on meter from 11 to 15 and it finally died. I assumed it was the alternator and ordered a new one. Installed it and it acted fine until it warmed up then it started acting up again. After warm it says low oil pressure charging system failure and knocks between 2000 and 3000rpm. Beyond or below those it is fine. It throws 02 sensor bank 1 bad on for the service engine light when plugged into scanner. Any thoughts or help is appreciated.



techforfree
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Mar 7, 2012, 8:56 PM

Post #7 of 10 (6264 views)
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my bet is going to be on a ground that got disconnected when the intake was removed,theres at least 5 or 6 ground looms in various locations on that engine,start with the battery ground to make sure its attached properly,from there i think on the stat housing and on the intake manifold theres a few studs with 2 or 3 ground looms on each.. make sure one wasn't missed..and is dangling someplace..good luck


fullstringer
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Mar 8, 2012, 5:37 AM

Post #8 of 10 (6252 views)
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Alternator taken off was bench tested and new alternator in car was test in car and no it wasn't tested under load because of the knock I didn't want to run it.


Hammer Time
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Mar 8, 2012, 6:57 AM

Post #9 of 10 (6246 views)
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Quote
new alternator in car was test in car and no it wasn't tested under load because of the knock I didn't want to run it.



How do you test an alternator in the car wiithout running the car?




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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.



Discretesignals
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Mar 8, 2012, 7:58 AM

Post #10 of 10 (6240 views)
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How is the coolant level in the radiator (not reservoir)?





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

(This post was edited by Discretesignals on Mar 8, 2012, 7:59 AM)




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