Question about 2005 Pontiac Grand Prix

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I have a 2004 grand prix 3800 engine non turbo. Engine was eratic at cruise with rpms at 1200-2000. rpms would lope 2-300 rpms. I Changed air and fuel filter, and cleaned the throttle body. also checked the coil block connector for corrosion. Started the car with the mass airflow sensor hose disconnected by accident. The engine immediately went to limp mode. I had check engine light on, reduced power warning and traction control warning. reconnected the hose, no change. I disconnected the battery for 20 min started the car and everything was normal. no dash lights or warnings. Drove the car for about 10 min at speeds up to 60 mph. engine still loped but ran ok. Suddenly all the warning lights returned including traction control and went to limp mode. disconnected the bat, restarted,and everythings normal. Any ideas whats next to check?

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  • Phil Nemick
    Phil Nemick Dec 25, 2013

    I have the same problem that I can seem to fix. If anybody has had the same problem please email me with your

  • John Hicks
    John Hicks Jul 03, 2014

    I had a problem with my 2006 explorer flashing all lof the lights on the dash board and it wound up being the battery the voltage was low and I had a whole slew of lights on so try that if you were to disconnect the altenator with the car running and it dies you mostlikley have a bad battery.



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I had a problem with all my lights coming on in my 2006 explore took it to dealer to find out that the battery was dying replaced it and they went away

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What is the tps location on a 3800 series 3 engine?

First find the air filter. Follow air filter housing up towars motor. You should see a throttle cable. Your throtle sensor is right there.

Oct 17, 2010 | 2004 Pontiac Grand Prix

1 Answer

I need a diagram for serpentine drive belt for a 2004 Grand Prix with a 3800 engine.


Go to the following web site (copy and post the web address to your browser)!OpenDocument

There are 2 PDF documents above the photo. The first gives you theRouting guide for the vehicle/engine - 6-24 - on pages 103/104 of the PDF doc and the second document ( Illustration PDF) gives you the belt routing diagram for 6-24.

Hope this gives you what you need.
Voluntary contributor.

Dec 12, 2009 | 2004 Pontiac Grand Prix

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2001 grand prix gt 3800 engine started boging down changed fuel pump and filter still doing it sitting still at high rpms it boges an its like its loosing throttle

try taking the oxygen sensor out of the manifold by the firewall and take it for a ride,it sounds like u have a plugged catalytic converter,by removing the sensor your givin the pressure somewhere to escape,if u do have to replace the cat converter i would suggest putting a factory converter on it because if u dont, the check engine light will come on due to the fact that aftermarket converters only have three of the four precious metals required to work properly thats why they are cheaper

Sep 06, 2009 | 1997 Pontiac Grand Prix

1 Answer

Engine surges under load at 3800 rpm

yes it could be. have fuel pump pressure tested, fuel pump pressure should be. (key on engine off) 1999 to 2000--with egr--41 to 47 psi without egr--52 to 58 psi,

May 30, 2009 | 1999 Pontiac Grand Am GT

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I have a 97 pontiac grand prix with a 3800 v6 non cupercharged engine. Service engine light came on so i changed spark plugs and wires with oem parts. Now it is hesitating and running rough with service...

You need to read the codes. Get an OBD2 code scanner from your local auto parts store,, then read the code stored. Then you will have a better idea what is going on.

Mar 11, 2009 | 1999 Pontiac Grand Prix

1 Answer

Ildleing up and down and running high on the rpms

I had a simular problem on my car, but it is'nt a Pontiac, it's an Mazda 323. I solved the problem to be that the Idle air control valve was dirty, and therefore sticking. This caused the engine to idle eratically and sometimes stall. Sometimes it would even stall whilst changing gear.
On most cars the idle air valve is located at the top of the engine, normally near the air filter. And to be honest is very easy to service. It's just a matter of disconnecting and cleaning it with carburetter cleaner.
You probably know this already lol, I'm not sure if you mean this when you say sensor. Hope this was of some help! :)

Feb 03, 2009 | 2005 Pontiac Grand Prix

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