Question about 1999 Pontiac Grand Prix

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What are the symptoms of a faulty TP sensor and oxygen sensor?

I have a 99' pontiac grand prix se 3800 and I have had all kinds of different mechanics tell all different things (EMC codes), except that it is an electrical problem. When I start my car it stays on but the idle bounces up and down between 1/2- 2 1/2 RPMs and sounds really bad. Sometimes it just turns off after idling for a little bit. If it helps, the problem started after I drive threw a puddle of water but it wasnt that deep. I think I might have shorted out a sensor on the bottom of the car. Any help we be great, thank you!

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  • Paul Rey
    Paul Rey Apr 16, 2009

    thank you

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If you tps is bad it should throw a default code, mostly stalling, bad emissions, poor fuel economy,
diagnostic might tell you isc motor.


hope 2 help shack

Posted on Apr 15, 2009

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1 Answer

1996 Grand Prix: How much for a tune up for my Pontiac Grand Prix S...


spark plugs, wires, oxygen sensors, fuel filter,air filter, oil, oil filter and while your at it, ac filter. In AL it will run you about 200 done yourself.

May 16, 2010 | 1996 Pontiac Grand Prix

1 Answer

What kind of motor does a Pontiac Grand Prix have?


Depends on what sub-model you have. If you have an SE its a 3100 3.1L Engine. If its a GT its a 3800 3.8L Engine. If its a GTP its a 3800 3.8L but with a supercharger.

May 12, 2010 | 1997 Pontiac Grand Prix

1 Answer

My 1999 grand prix stalls and dies at stops.


My Pontiac Grand Prix is also a 99, it has 216,+ thousand miles on it, it runs great, idles good, I need to replace the oxygen sensor tho as it shuts off on me while driving or sometimes coming to a stop. You might try checking the fuel filter and pump as well.

Apr 17, 2010 | 1999 Pontiac Grand Prix

1 Answer

My 1999 grand prix 3800 v-6 stalls when stopped and hesitates around 2000 rpm


tough one, has many things that could be wrong..to give you some idea...Air filter, a loose air hose, gas filter,oxygen sensors, sparkplugs wires or even crossed wires will all play a role in the hesitation that your car is producing, I have 2 grand prix and one of them is hesitating on me right now, I know its the oxygen sensor but I cant fix it now, dont have the money to. I know it wastes more gas but oh well for now! Try testing first.

Mar 25, 2010 | 1999 Pontiac Grand Prix

1 Answer

I ran a scanner on my 2002 pontiac grand prix 3100 V6 and it reads out as multiple misfire i already changed the spark plugs,what could the problem be?


A code “multiple misfire” may mean that one or more of the following has happened:

•Faulty spark plugs or wires
•Faulty coil (pack)
•Faulty oxygen sensor(s)
•Faulty fuel injector(s)
•Burned exhaust valve
•Faulty catalytic converter(s)
•Stuck/blocked EGR valve / passages
•Faulty camshaft position sensor
•Defective computer

If there are symptoms such as the engine is stumbling or hesitating, check all wiring and connectors that lead to the cylinders (i.e. spark plugs). Depending on how long the ignition components have been in the car, it may be a good idea to replace them as part of your regular maintenance schedule. I would suggest spark plugs, spark plug wires, distributor cap, and rotor (if applicable). Otherwise, check the coils (a.k.a. coil packs). In some cases, the catalytic converter has gone bad. If you smell rotten eggs in the exhaust, your cat converter needs to be replaced. I've also heard in other cases the problems were faulty fuel injectors.

Random misfires that jump around from one cylinder to another (read: P030x codes) also will set a P0300 code. The underlying cause is often a lean fuel condition, which may be due to a vacuum leak in the intake manifold or unmetered air getting past the airflow sensor, or an EGR valve that is stuck open.

Feb 01, 2010 | 2002 Pontiac Grand Prix

2 Answers

Where is the Mass Air Flow Sensor loccated?


Pull of the grey cover and right before the intake its a black thing about two inches wide with two screws and a wire harness

Apr 16, 2009 | 1999 Pontiac Grand Prix

1 Answer

What are the symptoms of a faulty oxygen sensor?


bad oxygen sensor will make a car run rough.also mass air flow sensor egr valve sticking open or pvc valve open.idle speed control problems.have your car scan.because there are many sensor causes it to run rough.

Apr 16, 2009 | 1999 Pontiac Grand Prix

1 Answer

1991 pontiac grand prix se won't start


Probably need the computer reset. All these cars now days are set up for the dealer to screw you. The fix yourself is about history

Mar 16, 2009 | 1991 Pontiac Grand Prix

1 Answer

Power steering fluid on grand prix


You should add it to the power steering pump reservoir, which if you have the 3800 series II its behind the engine on the passenger side.

Oct 20, 2008 | 1999 Pontiac Grand Prix

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