Question about 1998 Pontiac Grand Prix

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My 1998 Pontiac Grand Prix GT is throttling high and is constantly stuck open. What could it be?

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6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

davidg65
  • 26 Answers

SOURCE: 2002 Pontiac Grand Prix Thermostat

as you face the engine the thermostat bell is on the right (drivers side) Follow the radiatoe hose. Remove the two bolts and raise the bell still attatched to the hose. the thermostat is there with the rubber seal. You can gently pry the thermostat out with a screwdriver or something similar. Put in new thermostat be sure it is the same as the old one, and then replace or change the seal (be sure it is the smae size and thickness as the old one as I got the wrong size from Napa) Then replace the bell, and tighten, but not over tighten. I hope this helps!

Posted on Jan 31, 2009

  • 158 Answers

SOURCE: 2001 Pontiac Grand Prix Gt not shifting into OD

this trans is the 4T65E. It needs a 4th clutch hub. The splines strip off around 120k or more because they weren't hardened from the factory. The new ones have the hardened splines. The trans needs to come out and be partially torn down. I've fixed alot of these. Change the EPC solenoid while you are there. They wear and hang up causing intermittent harsh shifts

You can drive them forever without changing the hub but you'll never have 4th gear

Posted on Apr 02, 2009

  • 1 Answer

SOURCE: LOOKING FOR A FUSE BOX DIAGRAM FOR 2004 PONTIAC GRAND PRIX GT

It's under the hood, on the driver's side, under a square, black box with a lightning symbol on it. Loosen the flower-shaped screw that holds the lid of the box down, remove the lid, flip it upside down and when you look at the inside of the lid, you'll see a map of all your car's fuses. There's also a fuse diagram on the very end of the dash, but it's accessible only when you open the driver's side door. When you're driving, that end of the dash is blocked by the closed door.

Posted on Jul 01, 2009

motor1258
  • 6674 Answers

SOURCE: spark plug gap for 2005 pontiac grand prix gt 3.8

.060 thousandths of an inch.

Posted on Nov 19, 2009

  • 5 Answers

SOURCE: how much to change a oil pan gasket for 2001 grand prix 3.8 gt

If you want to repair the oil pan I would also check lower engine mount for leaking oil and cracks in anti sway bar near fitting's. This due to engine mount is oil filled. OEM sway bar is made of tubular steel and they crack easy. Replacement sway bar is solid steel. Here's the kicker. When they pull the lower frame to service oil pan. The engine mount and sway bar are attached to that frame. A honest mechanic should only charge for parts ($35 for mount and $100 for sway bar) and maybe a extra hour. My mechanic did all in 5 hours. FYI gasket is only $35 bucks. Good luck

Posted on Mar 02, 2010

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1 Answer

Will the motor and tranny from a 1998 pontiac grand prix GT 2 door coupe 3.8L motor fit in a 1998 pontiac grand prix GTP supercharged 3.8l motor


everything will cross over but the engine and transmission in the gtp are suppose be heavier duty built

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I have a Pontiac Grand Prix GT, 3.8 Liter Motor. Two codes PO108 Map/Baro CKT High Input, and PO121 Throttle/Pedal Position sens A ckt Rng/Perform, according to the scanner. Did I need a Map Sensor and...


Change the throttle sensor first, and see if the map sensor is a victum. throttle sensor is similar to an old volume reostat, on some cars and everything else tries to do react, and everything errors out.... My bet is throttle position sensor... But you never know, it CAN be both, just usually not both.

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2003 Pontiac Gran Prix GT 3.8L Thermostat replacement


Yes. Remove the housing (not the hose) and you'll find the thermostat.

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2002 pontiac grand prix gt. High beams are dimmer


A loose ground wire to the headlight will keep it dim,Or a headlight adjustment will bring the headlight up.If you can have your headlight turned on a garage door or something at night,and then watch as you change your headlights from low beam to high beam which ones are higher.the last thing to verify is that your high beam headlights are not the plastic lens type that turn dull which cuts the light power.

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the po420 is catalyst system efficiency below threshold (bank 1)

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if this car is mostly city driving you might be able to clean up the egr valve and it might clear up the codes

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Sometimes the float in the low coolant sensor gets stuck.Find where the electrical connector is on the overflow tank and lightly tap on this area.This might dislodge it,if its stuck.Good Luck!!!

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Where is the throttle body located on a 2004 Pontiac Grand Prix.

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