Thinking about getting a GXP- What to watch for? - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


Bonneville GXP/ Northstar Powered Cars Discuss your Bonneville GXP and/or any other Northstar powered Olds or Cadillac... Including the 3.5L Twin Cam V6 (Short Star ) 4.0L and 4.6L Northstar V8's. Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

Reply
 
 
 
Thread Tools Search this Thread
Old 02-19-2009, 11:39 PM   #1
Junior Member
Posts like a Ricer Type-R
Thread Starter
 
Join Date: Jun 2003
Location: Omaha, NE
Posts: 16
Thanks: 0
Thanked 0 Times in 0 Posts
SteveI is on a distinguished road
Thumbs up Thinking about getting a GXP- What to watch for?

I've started traveling a bunch for my job so I'm looking for a "Road Car" and Bonneville is one of four cars I'm thinking about.

My 03 SLE was a great car. Bought it new and sold it 3 years old with 34k miles. My grandmother owns it now and it barely has over 40k on it! It did have the standard intake problem that all newer GM cars seem to have (fixed under warranty) but otherwise it was a great car that returned 30mpg on the highway.

If I get another Bonne I'm thinking about a GXP. I've heard many horror stories over the years about Northstars in Caddys. It seems they are either excellent engines or total junk in the shop constantly. I've driven several Northstars in Caddys and loved them but never owned one. If I buy a GXP, I want it to be low miles (30k or less).

Are there things I should look out for or look at when buying a used GXP?

Does the GXP get decent highway mileage?

Can I burn regular fuel or does it need premium?

Any advice you could give for GXP shopping would be great.

Thanks
SteveI is offline   Reply With Quote
Old 02-20-2009, 12:21 AM   #2
Senior Member
Posts like a Corvette
 
Join Date: Nov 2006
Location: Alberta, Canada
Posts: 1,446
Thanks: 0
Thanked 0 Times in 0 Posts
ddalder is on a distinguished road
Default

I've had my GXP for just under 2.5 years now. Personally, I really enjoy the car. It'* a wonderful highway vehicle, very comfortable. It would be very similar to your previous Bonneville in this respect. I've found the V8 has lots of power to pass when needed. The GXP only requires regular gas, although personally I burn mid-grade. I'm getting about 23MPG highway. Can't tell you about city, never really paid attention. If I like a car, I don't really worry about fuel economy too much. There are a few things I've come across problem wise.

Many of the other 2K+ Bonneville issues are not resolved in the GXP. This includes things such as the poor adherance of the door water deflectors leading to water leaks, the intermediate steering shaft, electronic compass module and horn.

If we're talking specifics about the GXP, there are also a few...

- The foglight wiring harness is a known problem. There is a TSB out for this.
- Some reports of coolant leaks.
- A particular beef of mine is the engine oil cooler hoses.
- Transmission cooler lines.

I had some fairly significant transmission problems when I first got the car, but I haven't heard of this being common. I've had no trouble since it was serviced. They recently found my oil pan is weeping. I did have a problem with the timing cover leaking. The harmonic balancer was scored and they had to replace it, the seal and the timing cover.

I've really had no issues with the engine from a mechanical or electrical standpoint, just some leaks. A mechanic friend of mine always says "If it didn't leak, it wouldn't be a GM". He also continues to say "... but at least they always start!". He owns four GM'* so he can't be very turned off by the problems.

The GXP has its moments of frustration, but I'd buy another one (at least I say that now... ask again in another 100,000km).

Last edited by ddalder; 02-20-2009 at 12:27 AM.
ddalder is offline   Reply With Quote
Old 02-20-2009, 11:58 PM   #3
Senior Member
Posts like a Turbo
 
ZeeVert's Avatar
 
Join Date: Jan 2006
Location: Brighton, Michigan
Posts: 255
Thanks: 0
Thanked 0 Times in 0 Posts
ZeeVert is on a distinguished road
Default

I drove a 3.8L Impala for a few years and got 28-29mpg w/ regular. My GXP gets 21mpg following the same route using premium. If I'm real careful, I can get 23mpg on the highway. So, don't have high expectations on the mileage.

At 15,000/yr & assuming $2.50/gal for premium, I figure a penalty of $550/year in gas expenses.
Name:  gasA.jpg
Views: 2
Size:  21.4 KB

I understand you can run regular (or mid-grade), but there should be some loss in performance and mpg.
Again assuming $2.50 vs $2.30 (premium vs regular), premium gas needs to get you about a 1.8mpg improvement in fuel economy for break even.

I've had some of the common problems, plus a wheel bearing and heat seater.

Would I buy another... probably not. Besides, in a couple years, it'll be tough to find one with lower miles.

But I'm not giving it up either. It'* a LOT of car! And a Love/Hate relationship. It beats the heck out of my wife'* CTS.
ZeeVert is offline   Reply With Quote
Old 04-16-2009, 12:39 AM   #4
Junior Member
Posts like a Ricer Type-R
 
Join Date: Apr 2009
Posts: 10
Thanks: 0
Thanked 0 Times in 0 Posts
EricZ is on a distinguished road
Default

My GXP is in the for sale section
EricZ is offline   Reply With Quote
Old 05-29-2009, 02:34 AM   #5
Senior Member
Posts like a Turbo
 
Bville_GXP's Avatar
 
Join Date: May 2009
Location: South Carolina
Posts: 248
Thanks: 0
Thanked 0 Times in 0 Posts
Bville_GXP is on a distinguished road
Default

Thanks for starting this thread... the info in the thread plus the little stuff i found thanks to google is showing me all green lights on this purchase.. I'm not worried about the MPG b/c my fiancÚ works about 5 mins from the house and she can take the GXP to work while i drive the 16miles up the interstate in the 2003 Grandprix SE....... I'm heading to the credit union in the morning!!!
Bville_GXP is offline   Reply With Quote
Old 05-30-2009, 11:31 AM   #6
Administratus Emeritus
Certified Car Nut
 
GXP Venom's Avatar
 
Join Date: Jan 2006
Location: Purgatory, Pennsylvania
Posts: 16,538
Thanked 7 Times in 4 Posts
GXP Venom is on a distinguished road
Default

Quess my PM didnt scare you away......ROFL!
GXP Venom is offline   Reply With Quote
Old 06-04-2009, 02:48 AM   #7
Senior Member
Posts like a Turbo
 
Bville_GXP's Avatar
 
Join Date: May 2009
Location: South Carolina
Posts: 248
Thanks: 0
Thanked 0 Times in 0 Posts
Bville_GXP is on a distinguished road
Default

lol... Naaa
Bville_GXP is offline   Reply With Quote
Old 06-04-2009, 10:51 AM   #8
Administratus Emeritus
Certified Car Nut
 
GXP Venom's Avatar
 
Join Date: Jan 2006
Location: Purgatory, Pennsylvania
Posts: 16,538
Thanked 7 Times in 4 Posts
GXP Venom is on a distinguished road
Default

I think I have the record for GXP gas mileage. After a night of nitrousing light to light.
Name:  montrose0450017.jpg
Views: 2
Size:  56.4 KB
GXP Venom is offline   Reply With Quote
Old 06-04-2009, 01:01 PM   #9
Senior Member
Posts like a Northstar
 
Nobotada84's Avatar
 
Join Date: Apr 2009
Location: Indianapolis, Indiana
Posts: 699
Thanks: 0
Thanked 0 Times in 0 Posts
Nobotada84 is on a distinguished road
Default

Quote:
Originally Posted by GXP Venom View Post
I think I have the record for GXP gas mileage. After a night of nitrousing light to light.
LOLOL!!!! U'd think u were drivin an old skool guzzler.
Nobotada84 is offline   Reply With Quote
Old 06-04-2009, 01:12 PM   #10
Senior Member
Posts like a Turbo
 
PaulPool's Avatar
 
Join Date: May 2009
Location: NJ
Posts: 257
Thanks: 0
Thanked 0 Times in 0 Posts
PaulPool is on a distinguished road
Default

haha that'* still much better than what my dad'* pick up that I use for work gets. '96 F250, probably about 8 city mpg, or maybe even less now considering it'* age.
PaulPool is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
thinking about getting an SSEi marquette97 General GM Chat 12 12-20-2005 01:15 AM
thinking of getting a Bonneville, need some suggestions brian89gp General GM Chat 12 12-20-2004 01:22 PM
I'm thinking about getting neons. rhalford15 Audio (and aftermarket electronics) 4 05-16-2004 05:14 PM
Thinking of getting a hood protector SSEimatt93 General GM Chat 1 06-24-2003 11:28 AM
Getting new job.. getting paid, getting mods Wolfedog50 Performance, Brainstorming & Tuning 3 05-08-2003 02:31 PM


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



All times are GMT -4. The time now is 10:05 AM.


We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.