Thread: Looking at buying a 2005 GTP comp

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  1. #1 Looking at buying a 2005 GTP comp 
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    hey, So i have been looking to buy a grand prix since my grand am was written off, I found a 2005 GXP for 12000 in near perfect shape but found a GTP comp for 4000 less. I test drove the GTP and noticed a few issues and just want your take on it since i am not yet familiar with this car or the SC 3800.

    GTP comp - 2005 15000kms (95000 miles ish)

    -The keyless entry does not work but that will probably be fixed by the dealer.

    -During the test drive when i came to a stop i noticed about 1/4 a cup of water pour onto the shifter from what seemed to be the dome light? is this a common leak area, Dealer thinks someone left the sunroof open a little?

    -The car has some rust I noticed on the rear suspension, is there any common rust spots on this car? the body is in perfect shape but i was not able to do a full check underneath due to weather. I would mostly likely be replacing alot of it anyways so im not to worried as long as the frame and subframe are good.

    - The car runs good but if you have it in park and rev the engine, around 3000 rpm you hear a knocking sound, i thought it was an exhaust clamp that was loose but im thinking either its old gas or not premium. (this one worries me)

    - There is a yellow engine light on, dealer is going to scan it monday and give me the code, ill post it here so you guys can maybe give me some insight thanks.
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  2. #2 Re: Looking at buying a 2005 GTP comp 
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    anyone?
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  3. #3 Re: Looking at buying a 2005 GTP comp 
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    Depends on the code might be an easy fix and it seems like the sunroof is leaking.
    98 GTP modded 1.9's, sd headers, 3.4", zzp 1.0 230K miles scrapped.
    04 Comp G zzp stb's, UMI ta's, Speedbuilt sways, bully flo heads, XP, zzp headers, fsic, thrasher shift kit, 60#, 2.6" corsa 2.5", Inferno hood
    01 gt z7 turbo tep trans zzp motor
    08 g8 gt cam exhaust 11.87@118
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  4. #4 Re: Looking at buying a 2005 GTP comp 
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    *update

    Code was po420, could a partially clogged cat be the sound im hearing? there is no excessive back pressure from what i can tell, and i dont know if MPG have dropped since i dont own the car yet. Do partially clogged cats make a strange sound around 3-4000 rpm?
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  5. #5 Re: Looking at buying a 2005 GTP comp 
    Moderator dsmuts's Avatar
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    Have the dealer replace the cat before you buy it.
    98 GTP modded 1.9's, sd headers, 3.4", zzp 1.0 230K miles scrapped.
    04 Comp G zzp stb's, UMI ta's, Speedbuilt sways, bully flo heads, XP, zzp headers, fsic, thrasher shift kit, 60#, 2.6" corsa 2.5", Inferno hood
    01 gt z7 turbo tep trans zzp motor
    08 g8 gt cam exhaust 11.87@118
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