Thread: 05 Grand Prix GTP : Boat with fake supercharger??????

So I just got this grand prix gtp with 140k miles on it .

The engine seems to run fine and stuff but im trying to determine exactly how bad this thing needs new shocks and struts, it feels like a boat and has weird sideways body roll when going over certain bumps is this thing supposed to handle nice and tight or is it normal for it to feel like a boat?

Also apparently this car has a 3.8L supercharged V6 but I wouldn't be able to tell honestly . Is there something wrong with this car or no.

Thanks

Open the hood. The engine cover will say atleast supercharged on it. Series 3 supercharged I think is what they say. If there’s no engine cover it’s not exactly hard to find the supercharger. It’ll probably be the first thing you see.


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the 2005 gtp came stock with 17's, if I remember right. 18's aren't much bigger. the only reason they wouldn't work is if you have a wheel that's too wide.

It's just poor definitions using wheel size.

18" should be GXP only struts.

If you have 16" wheels you likely don't have the sport suspension etc.

05 could have 16s or 17s based on trim, GXP is 18s

haha yeah you're right then the number on my tires indicates they are 17's . first i used a tape measure , i don't know where the fk your supposed to measure from because not even measuring rubber to rubber the diameter looked like 19 or more .

Originally Posted by 5am

haha yeah you're right then the number on my tires indicates they are 17's . first i used a tape measure , i don't know where the fk your supposed to measure from because not even measuring rubber to rubber the diameter looked like 19 or more .

You can't. It's the diameter of the inside bead behind the lip. Which is why it's on every tire sidewall.

So literally any shock will fit as long as it's not "FE4", or "GXP", or "18" wheel only". (Which are all the same)

Also, this recent thread we were just discussing how to ID what suspension your car came with.

http://www.grandprixforums.net/threa...kes)?p=1481068

Yours should be FE2.

I would: change all spark plugs, change all ignition wires, change all the coil packs and the ignition module. I would then have the suspension examined by well known shop and make any changes that they recommend. The Grand Prix is not a sport handling car; it's a road car that looks and feels great going fast in a straight line. My gp was getting 29/22 mpg hwy/city and it averaged about 25 mpg with about 80% freeway driving. I absolutely love my car even now when there is a miss on my #5 cylinder and my mpgs have tanked a bit (mostly due to me not putting it on the freeway). It now has 201K miles and I know a guy that has 2 that have 260K miles or better and he still drives the freeway with them....

Originally Posted by 5am

seems to get pretty bad gas mileage along with not seeming to roll as well as a car should. maybe it needs an alignment. hard to tell im not that smart. tires don't make any funny noise though .

untechnically speaking , my previous car (Subaru svx ) just seemed to want to roll or move easier , its not because of weight difference they are both about 3500lbs. maybe its how the transmission is geared . hard to tell if wheel bearings need to be replaced . the display does keep showing (service ABS ) and (service traction control). I think the dealership I bought it from needs to pay me some money back lol.

Originally Posted by davids06gp

I would: change all spark plugs, ....

lol those spark plugs in the back look like a bch

buying used cars is honestly pretty annoying , you need to notice everything wrong right away and then have a rough idea of how much it costs to fix each then be good at haggling . You need to drive something around for maybe a whole day or two to make a good decision, but cant .