Question about 1998 Pontiac Grand Prix

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98 grand prix stalls randomly. Sometimes when taking off, sometimes when slowing down. What could be the problem?

Has been doing this for quite some time and seems to be getting worse.

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The following are the general instructions on the start of diagnosing any electronically controlled engine or transmission problem.

The engine and the automatic transmission (transmission control is only for automatics, engine is still computer controlled no matter the transmission type) in this vehicle are computer controlled and in most cases when a fault occurs a fault code is stored in the memory of the computer control module. There are exception to this, such as the Mass Airflow Meter and fuel pressure problems. What must be done is to have all the basic testing done such as a scan of the system for fault codes as well as a check with a live data scanner tool for engine functions that are not within range of normal, a trained technician is required to know what is correct and what isn't, then based on careful diagnostics done from a factory repair manual the correct part is replaced or the wiring repaired or the computer replaced (known as the PCM or ECM,ECU), which is very rarely the problem. Other basic checks must be done as well such as mechanical problems with the engine as well as engine state of tune and mileage on the engine. The transmission can have mechanical issues as well such as no gear engagement at all or a failed pump or other pressure related problems. Also engine mechanical problems can and do cause many drive-ability related problem such as rough idle and other symptoms.

Posted on Dec 06, 2012

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Posted on Jan 02, 2017

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SOURCE: 1997 GRAND PRIX GTP TURNING OVER BUT NOT STARTING EVERY TIME

check the fuel pump and lines. look for the fuel filter and see how much junk is in it.

Posted on Sep 15, 2008

  • 3 Answers

SOURCE: Pontiac Grand Prix 98

When the window is not used often or gets a little older the motor can "Hang Up" You might try having someone hold the down switch on the drivers door while you slam the door. This will sometimes jar the motor enough to make the brushes contact and start working.

Posted on Oct 04, 2008

  • 3 Answers

SOURCE: bogging down

fuel filter????

Posted on Dec 01, 2008

thunderalley
  • 432 Answers

SOURCE: car stalls when you slow down for a stop, wont stay running idle

fuel filter most likely

Posted on Sep 24, 2009

  • 26 Answers

SOURCE: my dim headlights will go off while driving down

Change them

Posted on Sep 30, 2009

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1 Answer

98 GRAND PRIX WONT CRANK SOMETIMES


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My 98 pontiac grand prix sometimes will die going down the road sometimes it will start right back up sometimes it doesnt it takes a little while and also right before it dies sometimes tge rpms will go...


Might be your fuel pressure regulator.. also your car might be vapor locked.Next time it shuts off loosen your gas cap... If you hear it sucking in air... that's your problem...or your catalytic converter is clogging up...check the sensors on the pipes..If there bad it tells your car it needs more gas when it really don't...you will smell gas

Nov 10, 2017 | 1998 Pontiac Grand Prix

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Tach dies and engine stalls sometimes. i can't press the gas pedal too far or the engine revs and the car slows down but doesn't stall.


Sounds as if it is starving for air or fuel. check the air filter and replace fuel filter. if it still does it check the fuel pressure. if it is low replace the fuel pump

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I have a 2004 grand prix gt and sometimes on start it stalls


Take your car to a dealer and tell them to "clean the throttle body" Known problem for this year. It will solve your issue.

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I have a 98 grand prix 3.8L and sometimes it's hard to start. then sometimes going down the road the tach goes to zero and the speedometer starts swinging while the car is trying to stall.


If the vehicle cranks normally when not starting check the tach see if it is reading any engine speed. Sounds like the crank sensor is going bad very common fault on the 3800 series 1 & 2 engines. You must remove the harmonic balancer to replace the sensor.

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Pontiac Grand Prix 98


ur power box is warped.on the drivers door. same thing happened to my Grand Prix

Sep 17, 2008 | 1998 Pontiac Grand Prix

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