Question about 1998 Pontiac Grand Prix

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Grand prix starts and runs fine but after 10 to 15 min driving idle increase to 1500-2800 rpm. what could be the problem. Outside temps are between 75-100 F.

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Tranny mite be slipping or getting hot... look at the tranny cooler to elimanate this possabilty

Posted on Jul 20, 2009

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I have a 2005 grand prix gt temp guage reads normal and heat is on and warm when start driving heat gets colder or if i change to defrost its cold air doeasnt stay hot car doesnt over heat though changed...


The heating coil is probably getting plugged up. You may have heat at idle or slow speeds, but once you get going, there is not enough coolant going through it to stay warm. Get the system flushed or replace the heating coil.

Jan 23, 2014 | 2005 Pontiac Grand Am

2 Answers

Grand prix 02 cuts out when try to drive but idle fines


This vwehicle has a rev limiter, if your trying to rev it up in neutral it will cut out at 2grand.

Feb 28, 2013 | 2002 Pontiac Grand Prix

1 Answer

2004 Pontiac Grand Prix Temp Gauge not working and car not running properly.


I would check the coolant temp. sensor it should be in the head and have one wire on it. The manufacturers program the computers to change the air fuel mixture, and idle higher when the engine is cold. If the engine is at normal temp and the computer thinks its not it could be idling it up to bring it to proper operating temp.

Jan 19, 2012 | 2004 Pontiac Grand Prix

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I have a 2001 grand prix SE.... It been idling at 2500 rpm in park....and when driving the rpm goes to 1500 but it accelartes on it's own..... No lights come on in the dash..... It's seems only to...


For the high idle check for broken vacuum hose and vacuum leaks. This is the most common reason. If all of these are good then check the idle air control motor, on the side of the throttle body.These can stick open. for the high heat, first check to maintain enough coolant. It sounds like your coolant system is working properly, so You need to see if the coolant fans are coming on. The is a fuse and three relays that control the fans. When you run your car up to temperture and the fans don't work pull the fuse (30 amp) check it and put it back in. Also pull the relays and put them back in. Most of the time this fixes the fan problem as the fuse or relays just loose thier contact in the box. Let me know
Randy

Jun 09, 2011 | 2001 Pontiac Grand Prix

1 Answer

Car starts, idles and revs fine when in PARK. Put car in DRIVE and try to accel, there is hesitation and very poor accel and won't go over 2000 rpm. Car is not throwing any codes. 2002 Grand Prix 3800...


You may want to have the catalytic convertor checked out. it may need to be replaced.They can cause a car to run hotter and have poor acceleration to the point that the transmisssion won't shift. Also fuel filter could cause this but not usually. Hope this helps please leave comment.

Feb 13, 2011 | 2002 Pontiac Grand Prix

2 Answers

2000 grand prix, 3800 when it warms up losses power


I would have to say the fuel/water separator filter is clogged up. The filter will remove water and crud from the gas. It looks more like a small can under the car. If the car set up with a low tank of gas, water will condensate inside and once the new fuel sloshes around it gets all this junk off the walls of the tank and that gets sucked in the filter. Try and replace that first..

Mar 19, 2010 | 2000 Pontiac Grand Prix

1 Answer

My 1990 pontiac grand prix le will start and idle fine but when you give it gas and it gets up to 2000 rpm it bogs out and dies! hELp! what can it be?


it could be either a clogged catalytic converter, or a mass air flow sensor. One way to check the cat is to let the car run for about 10 minutes and look at the underside of the car to see if anything is glowing, or check it after a very short drive. To check the Mass airflow sensor locate it and unplug it while the car is running and see if it clears up.

Feb 05, 2010 | 1990 Pontiac Grand Prix

2 Answers

Throttle/Idle/running problem - wants to run too fast, or stall out


RPM's up and down check EGR valve and sensor. EGR valve and sensor control idle. That's why your getting the surging on rpm's and this could be giving out the other codes. If mass flow was bad car will not start and the same for the map sensor. O2 sensor measures gas and air for right mixer. TPS controls 0-60 speed as in throttle respons.

Apr 28, 2009 | 1989 Pontiac Grand Prix

1 Answer

1997 Grand Prix GTP starts but wont run for more than 5 Sec


is this a supper cahrged grand prix if so check fuel pump resistor located behind right front head light or on fire wall its made of white ceramic has to wires going to it jump the two wire on the connection going to it if it runs longer then 15 min then replace resiustor.

Jan 03, 2009 | 1997 Pontiac Grand Prix

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