Question about Pontiac Grand Prix
2001 Grand Prix GTP 3.8L Supercharged. The rpms will start to flucuate around 40-50 just driving on a flat road no uphill. Rpms will go back and forth between 1500 -2000 the car knocks a little back and forth when this is happening (I use Shell V Power so i dont think its the gas?) and the car seems like it will turn off, but nothing happens i just speed up and the problem goes away. I scan for codes almost everyday nothing pops up. At first i thought it was my TBS Sensor, replaced it with a new one and that didnt help any. Did a tune up 2 weeks ago. This problem doesnt occur everytime i drive probably like 3/5 of the time I drive my car. Ive read that it might be my MAF sensor. But i dont want to waste $150 on the sensor and that's not the problem. Thank you.
Try this,pull the maf out ,if you look there is a hot wire going across the tube(maybe 2),if it has any white crusty stuff on it ,just use some spray throttle body cleaner to clean it up,even if you can't see it ,try it anyway!
Cleaning the MAF should be a part of every tuneup
Posted on Feb 25, 2012
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Posted on Jan 02, 2017
upper left side of engine, near throttle body
Posted on Jun 30, 2009
Hello! This indicates a fault with the wheel speed sensor/ABS sensor. Any major auto parts retailer can pull the details of this code (which sensor) for free, which will help you identify if the wiring is loose or damaged or if the sensor will need to be replaced. If you need to replace the sensor - you will need to replace the entire wheel bearing assembly, as the sensor is internal.
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Posted on Nov 02, 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
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