Pontiac Grand Prix Forums : Grandprix

Car is 2002 GTP. Just replaced the LIM gaskets, valve cover gaskets, tb gasket and injector o-rings. the engine is now back together and it starts up and less than a second after she stalls out. disconnected the maf sensor and car runs but at very high idle (2500-3000rpm) and stays at that speed. cleaned the maf, same issue. replaced the maf, same issue. also changed the iac valve. no change. i was thinking a possible vacuum leak however i sprayed starting fluid all around the intake, s/c and throttle body and the engine did not surge up in speed. if you have any suggestions please leave them because i am at my wits end with this.

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2002 GTP 2DR Red Fire Mettalic

update. car runs now with maf pluggin in but surges badly. if i spray starting fluid near the front of the supercharger it revs up. obviously i have a vac leak but its difficult to determine where exactly. i used a garlock sc gasket... i hope i dont have to tear this thing down again.

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2002 GTP 2DR Red Fire Mettalic

It's def. a vac leak then... I just had the same thing happen today but it was a loud whistle and turns out I blew out a bolt we used to cap the line on the tb, I guess 10+psi can do that.

Take the lines off and make sure they are not cracked or anything and put them back on, the fittings can crack easily. Anything you can do to narrow down the leak, could also take the lines off while the car is running and see if it changes anything after you put your thumb over each connection you take off.

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2001 GTP PT61 Turbo, IC, #65 Inj. E85

took the supercharger off again and reinstalled with a thin coating on rtv on the sc gasket. put her back together and she still has the leak. im guessing this garlock gasket is the issue but this is rediculous

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2002 GTP 2DR Red Fire Mettalic

probably the lim

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99 GTP Mods: Performance: obx headers, 3.4, 1.9's, ported tb, ported m90, ported lim, water meth, full exhaust, k&n, tb spacer Visual: painted trim, black corners, mesh grilles.

certainly a possibility but i can spray carb cleaner all around the mating surfaces of the lim and nothing happens. if i spray near the sc gasket (mainly near the sc outlet) she revs up.

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2002 GTP 2DR Red Fire Mettalic

oh, throw a stock gasket on there and be done with it, garlocks suck ass from what i hear, never used one though.

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99 GTP Mods: Performance: obx headers, 3.4, 1.9's, ported tb, ported m90, ported lim, water meth, full exhaust, k&n, tb spacer Visual: painted trim, black corners, mesh grilles.

Yup...that is the reason right there...it warps. They blow. I used one too, had a leak...go get a stocker for $20 or whatever at the local GM dealership. Good as new.

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2003 Blue-Black Metallic GTP Sedan - Almost Done...
2007 Gold Mist Chevrolet Cobalt LT - Custom CAI, NGK V-Power's, Muffler Delete, Custom Tuned PCM...Sure does have every bit of 130 FWHP
http://www.cardomain.com/id/03blueGTP

advance wants 10 for them, or get a silicone one from parker.

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99 GTP Mods: Performance: obx headers, 3.4, 1.9's, ported tb, ported m90, ported lim, water meth, full exhaust, k&n, tb spacer Visual: painted trim, black corners, mesh grilles.

Advanced doesn't use the GM ones...they are Felpro, or whatever their brand is...spend the extra 10 bucks and do it right.

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2003 Blue-Black Metallic GTP Sedan - Almost Done...
2007 Gold Mist Chevrolet Cobalt LT - Custom CAI, NGK V-Power's, Muffler Delete, Custom Tuned PCM...Sure does have every bit of 130 FWHP
http://www.cardomain.com/id/03blueGTP

never had a problem with felpro, in fact they are identical to the factory ones

i use all felpro gaskets on my car and every car ive ever owned.

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99 GTP Mods: Performance: obx headers, 3.4, 1.9's, ported tb, ported m90, ported lim, water meth, full exhaust, k&n, tb spacer Visual: painted trim, black corners, mesh grilles.

yea i did it right and just ordered a pair of gm ones from zzp. hopefully i wont need the spare gasket. lol

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2002 GTP 2DR Red Fire Mettalic