Last post on Jul 28, 2011 at 8:56 PM
You are in the Pontiac Grand Prix
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Pontiac Grand Prix, Sedan
Apr 19, 2005 (12:16 pm)
“I have a 2005 Pontiac Grand Prix GTP Comp G. I need to know what mods I can make to get 300+hp without jeporadizing the reliability of the car.”
Trade it in on a 2005 (or, some time soon, apparently) a 2006 Grand Prix GXP.
303 HP / 323 TQ V8 – and a significantly beefed up automatic trans. to handle the additional stress.
But seriously, I have heard of many, many people replacing the S/C pulley and perhaps messing with the exhaust a bit and generating over 300 HP. The biggest longer term reliability issue is the automatic trans. Aux. cooling kits for the automatic are available. (I had a ’97 GTP with a S/C 3800 and did both a smaller pulley and custom MagnaFlow exhaust. The trans. lasted over 30,000 miles with no apparent ill effects.)
PFYC.com has 2004 items, including pulleys and trans. cooling kits.
Still waiting to see and drive the GXP . . .
#4148 of 4457 1999 Grand Prix
Apr 24, 2005 (5:07 am)
I bought my GP in 2001 with 60,000 km on it . I have 335,000 km on it now. 90% of my driving is highway and I am very happy with it. I do all my own regular maintanance on it. At 200,000 I switched to Synthetic oil every 10.000 km. At 100.000 km I pulled the plugs (copper core plugs) and put in Platnum plugs. I had to pull them back out after 6 months and put copper core plugs back in. The 3.8 was hard starting in cold weather and fuel economy was not as good. It ran much better with the copper. I just replaced the front right wheel bearing yesterday( A very easy job) . Now My heater fan is starting to squeal and I need to know if it is an easy job to replace. I am hoping to get 500,000 before I get rid of it.
#4149 of 4457 Anyone here of this?
Apr 27, 2005 (10:42 am)
2001 GP-GT 3.8L lost power on hills eventually died! Towed to shop, after a while they found a hole in the “plastic” intake manifold. Looks like it melted through, hole is on the engine side of the throttle body flange. I’m pissed, mechanic called the dealer for new part, dealer said this is not an uncommon problem, Well it should be! Anyone ever hear of this, also want to bring this to someone’s attention “saved old manifold” would like some advise.
Apr 27, 2005 (3:26 pm)
Does the '05 Grand Prix have the new 3800 Series III V-6 with full electronic throttle control, just like the Buick LaCrosse?
I heard a new one on the road today...no offense to you GP owners but when accelerating from a standstill the base GP sounds just like an '80s Chevy Celebrity.
#4151 of 4457 Re: Hello: [jrosasmc]
Apr 28, 2005 (6:28 am)
The GP was the 1st application of the 3.8 Series III engine.
Apr 28, 2005 (12:11 pm)
Has a article about comparing FWD, RWD and AWD. I have not read it yet, but they used a GP GXP for their test. I believe the AWD is a WRX and the RWD is a G35. If I remember correctly the 0-60 for the GXP is 6.0 sec.
May 02, 2005 (10:57 am)
According to the online order guide for 2006 the GT will be powered by the supercharged 3.8. Interesting.
#4154 of 4457 Re: Anyone here of this? [ken1776]
May 02, 2005 (12:06 pm)
That's a well documented and common problem with a LOT of 3.8L V6's made by GM with what was an EXTREMELY stupid and problem-ridden design of plastic. Not too long ago, in fact, with one of the later updates to the 3.8L, they responded by making the new intake out of aluminum on the 3.8L so it wouldn't crack or melt anymore....
You think that's bad, they also have MAJOR issues with about 9-10 years worth of 3.1L and 3.4L engines out there with bad head gaskets that prematurely break down and allow coolant to mix with the oil. Search the web a little bit, and you'll see LOTS of owners with the same issue....matter of fact, even check Ebay and you'll most likely run into at least a few GM minivans being sold "as is" in need of a head gasket, and they don't have many miles at all.
One would naturally think drivetrains are GM's strong suit, but problems like these have become quite common, though I think they are 95% resolved via updates in design and material to these engines and their components for '04 and newer vehicles.
#4155 of 4457 2006 Changes
May 02, 2005 (12:08 pm)
Here's the full list of 2006 changes from the GM ordering catalog:
GTP Sedan model
Interior trim (52*) Parchment/Dark Pewter
Interior trim (69*) Dark Pewter
Exterior color (12U) Galaxy Silver Metallic
Exterior color (15U) Sedona Beige Metallic
Exterior color (56U) Fusion Orange Metallic
Exterior color (88U) Graystone Metallic
(PDE) Comfort and Info Package
(PDF) Comfort and Infotech Package
(PCH) Leather Trim Package
(PCI) Driver's Package
(PCM) Driver's Package Plus
(PCJ) Premium Audio Package
(WS6) Competition Group
Interior trim (19*) Ebony
Interior trim (31*) Cashmere
Exterior color (46U) Stealth Gray Metallic
Exterior color (53U) Bronzestone Metallic
Exterior color (67U) Liquid Silver Metallic
(PCQ) Premium Package, includes (AR9) Seats, front Leather-appointed seating, bucket, with passenger side map pocket (Grand Prix/GT), (AR9) Seats, front buckets, Leather-appointed seating with UltraLux Suede inserts (GXP) (CJ2) Air conditioning, dual-zone, automatic, (U40) DIC/Trip computer, 5-button system and (KA1) Seats, heated, driver and front passenger
(PDE) Sun and Sound Package, includes (CF5) Sunroof, power, (U87) Sound system feature, Monsoon premium speaker system and (UC6) Sound system, ETR AM/FM stereo with 6-disc CD changer
(PDF) Security Package, includes (AY1) Air bags, side roof rail, front/rear, (JL9) Brakes, 4-wheel disc, Electronic Brake Force Distribution, antilock, (UJ6) Tire Inflation Monitor System, (NW7) Traction control, Enhanced Traction System (ETS), powertrain modulated (Grand Prix) and (NW9) Traction control, Full Function, powertrain and brake modulated (GT and GXP)
(B3Q) Accents, interior, chrome are included in (PCM) Preferred Package on 2WP69 and are standard on 2WR69 and 2WC69
Fog lamps are no longer standard on Grand Prix
(QB5) Wheels, 16" (40.6 cm) Black painted steel, with bolt-on wheel covers will be available on Fleet orders only
(PDX) Sport Package contains new content. (PDX) Sport Package includes (N10) Exhaust, stainless-steel, dual outlets, dual exhaust, (QP1) Wheels, 16" (40.6 cm) aluminum, polished, 5-spoke, (T96) Fog lamps, (TVP) Headlamps, projector-beam, (JL4) StabiliTrak Sport, (KB7) Transmission controls, floor shift, 5-position PRNDL, TAPshift, (NV8) Steering, power, rack-and-pinion, Magnasteer II variable assist and (UV6) Head-up Display (HUD)
(PCM) Preferred Package, includes (A85) Seat, front passenger seatback, flat-folding, (AL9) Seat adjuster, power, lumbar, driver, 4-way, (AP3) Remote vehicle start, (AP9) Cargo net, (NP5) Steering wheel, leather-wrapped rim and shift knob, (TR9) Premium Lighting Package, (UK3) Steering wheel, steering wheel mounted radio controls, (V62) Lifestyle Package, (VY7) Shift knob, leather-wrapped and (B3Q) Accents, interior, chrome
Interior enhancements including mini-perforated leather on the leather-wrapped steering wheel and shift knob and rubber cupholder inserts
Cigarette lighter door removed providing additional storage within the center console
(AL9) Seat adjuster, power, lumbar driver, 2-way (was 4-way in 2005)
And yes, the '06 GT does get the 3.8L Supercharged from this year's GTP. So, 3 choices now with the 5.3 V8 being at the top.
#4156 of 4457 06 changes
May 04, 2005 (5:11 am)
Strange they deleted the fog lights on the base car.
So am I to understand that bolt on covers are only available on fleet orders and that alloys are standard on all GPs?