I just purchased some spark plugs and installed them already(Back 4 were a bitch) they are NGK TR55 V Power Spark Plugs #3951. On Ebay it said that they would fir a 2005 GXP but doing more research these plugs fit the 2004 model but not the 2005 model. Do I have anything to worry about. I have them gapped to .5 as requested but now searching the internet more they are made for the 2004 GXP and the regular 3.8 but not the 2005 GXP. The car runs great but do I have anything to worry about. Thanks in advance., Jonathan

I didn't think there were different spark plugs 04 vs 05. I think what you got should be fine.

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WHITE WHINE - 1992 SSE Supercharged 236.26 ci (.040 Over) 15.090 at 90.2 MPH on old engine w/ slipping trans & melted O2 sensor - Gen 3 M62 and matching TB, Gen 2 Pully, Zillamotorsports Ported LIM, YT 1.72 Roller Rockers, SII FPR & Injectors, Hypertech Thermomaster chip w/ 160 Thermo, TransGo Shift Kit, Infinity/Pioneer Speakers & a 10" Alpine Type R Sub, all the watts, 140 amp Alternator, Ricepipe CAI w/ heatshield, Pilot Angel Eye Foglights, Clear Corners, '02 17" Chrome Bent 5's, Magnaflow F-Body Muffler and Hi-flo Cat, Ceramic Coated Ported Exhaust Manifolds, Fan Override, Monroe Reflex struts, red calipers
2009 G8 GT - Sport Red Metallic, loaded, SOLO Axlebacks, Rotofab Intake, Tuned, autodim mirror, removed intake manifold cover, HSV GTS triple gauge pod, two tone red-hot shifter and HSV SuperSport steering wheel, GXP rear sway bar and diffuser, 3.45 diff and various Camaro suspension bits, LED Taillights

I do not believe there was a change between the 2004 and 2005 Northstar as far as plug threads and depth go. As long as it threaded in, fit the coil and it runs good, you got the right plugs.

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Bye Bye:

RIP sandrock

Thanks guys for the information. I appriciate the input. It makesme feel better now that I have a little back up. Take Care guys,

Same engine, same plugs, same heat range, same thread depth, etc. Nothing from that facet has changed on the N*. The TR55 fits pretty much every GM engine. LSx's, Vortec's (Cast iron version of the LSx), 3.8's, 3.4's, etc, etc.

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Retired Bonneville Owner and former GM Tech:
2004 Pontiac Bonneville GXP: Black/Ebony *SOLD*

Summer Toys: Combined 827 RWHP / 877lb/ft RWTQ
2004 Pontiac GTO: Impulse Blue Metallic/Black/M6: lots 'o mods, 415 RWHP / 405lb/ft RWTQ!
2006 Cadillac STS-V: Light Platinum Metallic/Light Gray/A6 - Spectre CAI, Magnaflow exhaust, Speed Inc. tune, 412 RWHP / 472lb/ft RWTQ

Daily Drivers:
2019 Chrysler Pacifica Limited: Mommy's new RGC
2015 Chrysler Town & Country Limited Platinum: Kids new RGC
2007 Chrysler Town & Country Limited: Sold to neighbor
2009 Pontiac G8 GT: L76, Sport Red Metallic
2003 Chevrolet Suburban 2500: Doeskin Tan - 8.1L Big Block... new plow truck
1999 Chevrolet Suburban: Sunset Gold Metallic - Daddy's winter beater and plow truck

As far as buying parts off ebay you gotta be careful b/c i have seen stuff like Fog light housing for sale and it said fits Bonneville 1997-2005 including GXP.. Well, i think we all know thats not true!!!

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2005 Bonneville GXP Fully Loaded

It doesn't help that anytime you go look them up online, GMPartsdirect, etc, they all come up as a regular Bonneville light, so...

_________________


Retired Bonneville Owner and former GM Tech:
2004 Pontiac Bonneville GXP: Black/Ebony *SOLD*

Summer Toys: Combined 827 RWHP / 877lb/ft RWTQ
2004 Pontiac GTO: Impulse Blue Metallic/Black/M6: lots 'o mods, 415 RWHP / 405lb/ft RWTQ!
2006 Cadillac STS-V: Light Platinum Metallic/Light Gray/A6 - Spectre CAI, Magnaflow exhaust, Speed Inc. tune, 412 RWHP / 472lb/ft RWTQ

Daily Drivers:
2019 Chrysler Pacifica Limited: Mommy's new RGC
2015 Chrysler Town & Country Limited Platinum: Kids new RGC
2007 Chrysler Town & Country Limited: Sold to neighbor
2009 Pontiac G8 GT: L76, Sport Red Metallic
2003 Chevrolet Suburban 2500: Doeskin Tan - 8.1L Big Block... new plow truck
1999 Chevrolet Suburban: Sunset Gold Metallic - Daddy's winter beater and plow truck

Everything appears to be running good. 26MPG on the hi-way and 19 in town. Overall we average around 23MPG so it appears the plugs are doing their job.

I wish I got 26mpg on the highway. :(

Even with cruise control, my lead foot (speed) curtails that.

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Retired Bonneville Owner and former GM Tech:
2004 Pontiac Bonneville GXP: Black/Ebony *SOLD*

Summer Toys: Combined 827 RWHP / 877lb/ft RWTQ
2004 Pontiac GTO: Impulse Blue Metallic/Black/M6: lots 'o mods, 415 RWHP / 405lb/ft RWTQ!
2006 Cadillac STS-V: Light Platinum Metallic/Light Gray/A6 - Spectre CAI, Magnaflow exhaust, Speed Inc. tune, 412 RWHP / 472lb/ft RWTQ

Daily Drivers:
2019 Chrysler Pacifica Limited: Mommy's new RGC
2015 Chrysler Town & Country Limited Platinum: Kids new RGC
2007 Chrysler Town & Country Limited: Sold to neighbor
2009 Pontiac G8 GT: L76, Sport Red Metallic
2003 Chevrolet Suburban 2500: Doeskin Tan - 8.1L Big Block... new plow truck
1999 Chevrolet Suburban: Sunset Gold Metallic - Daddy's winter beater and plow truck

Idk how you guys do that, lol. My dad only gets 20-21 with his...

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Bye Bye:

RIP sandrock

Yea, that's about what I get. My last extended trip I got 21'ish. And that was me babying it from slow ups in traffic and "only" doing 75 with the cruise control. Trust me, 75 is crawling for me... I go any slower and I could get out and walk away from the car...

_________________


Retired Bonneville Owner and former GM Tech:
2004 Pontiac Bonneville GXP: Black/Ebony *SOLD*

Summer Toys: Combined 827 RWHP / 877lb/ft RWTQ
2004 Pontiac GTO: Impulse Blue Metallic/Black/M6: lots 'o mods, 415 RWHP / 405lb/ft RWTQ!
2006 Cadillac STS-V: Light Platinum Metallic/Light Gray/A6 - Spectre CAI, Magnaflow exhaust, Speed Inc. tune, 412 RWHP / 472lb/ft RWTQ

Daily Drivers:
2019 Chrysler Pacifica Limited: Mommy's new RGC
2015 Chrysler Town & Country Limited Platinum: Kids new RGC
2007 Chrysler Town & Country Limited: Sold to neighbor
2009 Pontiac G8 GT: L76, Sport Red Metallic
2003 Chevrolet Suburban 2500: Doeskin Tan - 8.1L Big Block... new plow truck
1999 Chevrolet Suburban: Sunset Gold Metallic - Daddy's winter beater and plow truck

i got 26.2 mpg with mine yesterday driving 250mi around 70-75mph.

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2006 Crown Vic, white P71 interceptor. Push bar, 35% tint.

TRADED IN! 2008 G8 Ignition Orange Metallic LY7, 47k miles, Flowmasters, all options but sunroof.

SOLD! 2000 SSEI Black, 180 t-stat, autolite 104's, 3.4" MPS, custom M&D CAI, 1/8" phenolic S/C spacer, throttle body heat sheild, solid front mount, MSD wires, shift kit, 3rd brake light overlay, cleared headlights, tinted and cleared tails, 20% tint, Syntec, ARP license plate bolts Goodyear Eagle GT's,disabled DRL's, 8000k H.I.D's, pilot angel eye fogs

TRADED IN2004 GXP Black. 53,000mi.... drop in K&N filter, 5000k H.I.D. lows, 8000k H.I.D fogs, switchback 5000K turn signals. cleared headlights. 20% Tint.