SOURCE: 2004 grand prix gt going crazy
I think its you alternator, the battery and alternator kind of work back to back with each other. I will take the car to shop that you know and can trust and have them diagnose the car all together. Good Luck.
Chula_07
SOURCE: I have a 2004 grand prix gt and sometimes on start it stalls
Take your car to a dealer and tell them to "clean the throttle body" Known problem for this year. It will solve your issue.
SOURCE: my 2004 pontiac grand prix window it will go down
Does it try to come up, EG is there power being applied when you press the UP switch? if it makes no sound or movement when pressing the UP switch it is probably a worn out switch - available at Pontiac dealers though you may have to order it and wait a few days - have your VIN number for the parts desk and you'll get the part in no time - the switch levers out of the panel - use a plastic tool if possible to prize the switch out so you don't damage the surrounding trim - the cable connector clips off the old switch and goes on the new switch, press the switch home into the recess and jiggle it a bit to make it dead flat - window should work now.
If it IS making an effort to come up then either you have a poor earth or power connection making it so there is not enough power to pull the windows up (which is harder than down due to the weight of the window)
-- check the cabling behind the door panel, and as above pull out the switch and check its connector too.
OR... the window is out of alignment and is jamming - putting it back in alignment means taking off the door panel and getting at the bottom of the window runner, loosening the bolt(s) on the bottom of the runner and moving it sideways so it hold the window steady but not tightly, you may have to try having it tighter or looser against the window till you get the best performance - also oil the moving parts/cables of the window mechanism (dont get oil on the glass, it will smear for weeks) to give the best chance of smooth operation.
SOURCE: What is 2004 grand prix gt 3.8 engine head torque table
Go to autozone.com create a free account put in you cars model year etc... then look at the free manual for replacing head gasket it will have a bolt tightening sequence diagram. also they usually have to be taken off in a paticular sequemnce to avoid warping the head. If aluminum heads they usually recommend new head bolt set and having the head shaved (Leveled)
SOURCE: how to replace battery 2004
you have to take off your engine cross member that is over the top of your battery and than disconnect your battery. There is 2 bolts on the bottom that hold your battery to the mount unbolt those and it should come right out
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