Thread: Bought my first GP need some help!

Hello everyone, My name is Ryan and I just joined because I bought my first 2005 Grand Prix GT 3.8, 110k Miles and need help.

Fresh Oil Change, Oil Filter, Air Filter.

Car History: A young lady owned the car previously and owned the car since 2007. She recently moved out of state and left her car at her parents house. She was planning on coming up to get the car but then decided to just buy a car near her. The car sat the whole winter which I believe it was not started at all which brings me to my first question. The battery was just replace because the other one was dead. The father bought it from "Discount Battery" and im not sure what brand it is but im sure its some cheapo battery because its small and CA is 440 and CCA is 550. When I was checking out the battery I noticed I had at least "1 in" on both sides and "1 in" in the back.

I want to know if this battery is to small for my car because I noticed sometimes when I go to start my car that it will start run for a second then die. When it does that I will start it again and tap on the gas then it will run fine. When I turn the steering wheel or put my foot on the brake and shift through "Park, Reveres, Neutral, and Drive that I noticed sometimes my head lights will dim and radio. I'm not sure if its the battery or if its just because it sat for awhile and is acting up. I do not have any codes or engine light on.

When we test drove the car my dad shifted through each gear and it was super smooth, no jerking or anything. Last night when i got home from a friends house and when I noticed the lights going dim from shifting, I also noticed when I shifted from Neutral to Reveres it would jerk a bit and my feet could feel it. I read it could be a bad mount but it only did this last night. The car drives and shifts smooth so I don't think my transmission is bad. I also check the transmission fluid and it was still good and at the right level.


Any helpful advise would be much appreciated!

welcome to the forums

The bettery is pretty much used to just start the car. The car should run fine without a battery altogether. It sounds to me like a connection somewhere. Check your grounds and have the alternator tested. Make sure all the power wires are clean and tight.

I run a smaller battery on my accord. Doesn't affect much, just takes an extra crank to start. And yes. Welcome to the forums.

You most likely have a 75 series battery installed in the car, which came stock in Grand Ams and other N-bodies. Our come with a 78 series, both should work just fine to crank over our engines.

Most batteries are made by the same company, Johnson Controls so branding isn't that important it is just a sticker on the side.

I would start by checking how many Volts your Alternator is outputing, and checking all of your connections it may just be a bad ground, which can get corroded quickly if someone leave a car parked all winter, outside on a surface that is not concrete.

Beyond that I might check out your spark plugs and other tune-upables just as a precaution to having a new car.

After work I got into my car and started it and the RPMs were about about 1000-1200 then slowly went down. When i got home and I put it in neutral my RPMs were about 700-800 RPMs and when i put it in reveres my RPMs drop down to about 500-600 RPMs. It does make a funny noise when I put it into reveres so I might have a bad trans mount?


Thank you all for the welcomes and helpful advise! =D

So my idle seems fine then! I went from a 97 Ford Ranger to a 05 GP so its different by a long run!. The Neutral to Reverse concerns me cause I guess you can say it clicks but I can feel it with my feet. So I was wondering could a trans mount be bad?


Cool your from Michigan too! ^_^