Question about 2000 Pontiac Grand Prix
1999 Grand Prix GTP. Catalytic convertor fine. When you got to wide open throttle it loses power. Super charger pressure looks fine.
Use a scan tool to check for KR.
Check spark plugs / wires.
try a colder range plug if running more boost.
Posted on Jun 24, 2009
Make sure it always gets premium fuel...even with premium and especially in warmer weather the GTP will frequently perform the factory programmed KR (knock ******.) In WOT it is also more susceptible to running a lean condition with stock programming.
Things you can do to troubleshoot the problem and give more consistant performance with the GTP is run colder range copper core plugs and/or any brand of cold air intake, or even a stand alone 9" open element cone filter. Both are better than stock and provide more airflow even though the stock airbox was redesigned in '99. What else you can do is not limited to that but a start. Good luck.
Posted on Jun 23, 2009
Well, the short answer is "yes". But - it isn't nearly as simple as just bolting the supercharger onto the intake and VOILA!, now you're supercharged. The procedure that you're inquiring about is commonly referred to as a "top swap", and there are numerous parts you will need for both engine as well as the transmission. Why the transmission? Because the GT and GTP use different gear ratios and the GTP has a 4T65HD as opposed to the 4T65E that is in the SE/GT. You will also need to have the PCM reprogrammed to accomodate all of these changes.
HERE is a great website that has a ton of very useful information, regarding this and many other Grand Prix topics.
Hope this helps and thanks for using FixYa!
Posted on Oct 21, 2009
The thermostat housing is located in the upper radiator hose. You will see a metal elbow secured by two bolts into what I remember is the upper intake manifold...don't quote me on that but you will see it regardless of whatever I call it. Anyways, GM decided it was a good idea to put stainless steel bolts in there but that makes it easy to strip the threads in the bolt hole so I think it's best when you put your wrench on the bolt to just tap on the handle till you vibrate it loose, then turn it.
When you pull off the housing you'll lose a little coolant and it will create an air pocket which we'll address. It's a 50/50 chance that the thermostat housing gasket will either stick to the housing or the engine...it may be torn, cracked or flaking in either case clean both contact surfaces before you replace the gasket. I recommend an oil impregnated poly material gasket.
Note the position of the thermostat in the hole and place the new one in as such.
I recommend a 180 degree thermostat...stock is 195 but the GTP runs better with the 180.
Put on gasket and reinstall the hose/housing assembly, alternate from one bolt to the other so the housing mates flat and cannot cause a leak.
Next, fill the coolant overflow bottle to the "HOT" mark. If the bottle is dirty and hard to see just put a light on top of the bottle...GM didn't mark it very well so if it's not squeaky clean you can hardly see a damn thing.
*IMPORTANT** if your car still has Dexcool in it, DUMP IT. It will eventually destroy the motor.
If not...continue on. Start the car. Go back to the thermostat housing and place a rag on top of, and twist the peacock valve on top of it to let the air out until it starts to get coolant on the rag. Done.
Posted on Feb 27, 2010
Remove all parts to access the throttle-body, typically the sensor is on the side with 2 screws. Remove the wired plug and then the two screws. Assembly is the reverse being careful to fit the flat piece of the throttle-body into the groove of the sensor. Do not overtighten.
Replace connector and other parts.
Typically the sensor is on the drivers side of the throttle body. May be a torx screw, or phillips (star).
Posted on Jun 13, 2010
SOURCE: where is the throttle control
The throttle control sensor is called a TPS which is mounted on the throttle body. You will see three wires that plug into it. The throttle body replaces the old carburetor since the engine is fuel injected as you may know
Posted on Jul 27, 2010
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