Question about 2004 Pontiac Grand Prix

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2004 Pontiac Grand Prix gtp

I have had an emission warning light on and was told at the auto parts store it meant I had a problem with my gas cap. This was after the ran the code on their diagnostic machine. I bought the gas cap and the light has come back on. I have 144,000 miles on this car and service it on a very regular basis but hate to spend $90 to find out what the error is actually saying.

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  • markbeintema Jan 23, 2009

    exact same problem, the first time i bought a new cap the light stayed off for a couple months, then came back on, i bought a new one again and after reseting the light it always comes back on after a couple days OBD II code is 0455 gas cap/evap system. Really annoying, any ideas how to fix it?

  • BB1BUD May 11, 2010

    The evap. vent solenoid is the most likely cause of the light. p0445 or p0442 are codes for evap leaks. The solenoid sticks open or closed. It's located near the fuel inlet hose, behind the left rear fender. Go to an auto parts store, they will check your codes for free.

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  • Pontiac Master
  • 757 Answers

Check all of your vacuum lines and their fittings.

Posted on Jun 23, 2009

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  • Contributor
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I have the same emission light stay steady on my 2004 GTP for the past year. Doesn't mean a thing because it passed aircare last month so I wouldn't worry about it. The light is irrating because it stares at you in the face but i can deal with it rather than shelling out hard earned cash. Thats my opinion. Good Luck

Simon
simonkhpa@yahoo.com

Posted on Aug 06, 2009

3 Suggested Answers

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SOURCE: Location of mass air flow sensor, 2000 Grand Prix GTP

3.1 or 3.8 motor, mass air flow is in the fresh air (goes from air cleaner to engine)

Posted on Feb 07, 2010

mlapres
  • 757 Answers

SOURCE: replace thermostat on 2003 grand prix gtp with

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

mlapres
  • 757 Answers

SOURCE: belt diagram for 2001 grand prix gtp

Here you go.

http://www.zzperformance.com/grand_prix/articles1.php?id=57

Posted on Oct 10, 2010

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