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My 1999 Grand Prix GTP won't start after changing

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Double check the wiring harness to make sure it did not get pinched under the manifold or the top cover. It is common for a single wire to get pinched and shorted and cause this.

Posted on Oct 31, 2012

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Posted on Jan 02, 2017

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SOURCE: 97 grand prix gtp starts then immediatly dies

If you have a GTP these engines use a hi output fuel pump. they use a fuel pump resistor located under the battery tray (look up from under the car) This resistor lowers the voltage to the fuel fump when not in boost mode. because of its locatoin it is prone to corrosion. if you bypass the wires and the engine starts and stays running replace the resistor

Posted on May 16, 2009

junit80
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SOURCE: 2002 Interpid 2.7 L died on road now no start!

sounds like a bad ecm aka computer to me.have ecm checked

Posted on Aug 15, 2009

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SOURCE: Location of mass air flow sensor, 2000 Grand Prix GTP

3.1 or 3.8 motor, mass air flow is in the fresh air (goes from air cleaner to engine)

Posted on Feb 07, 2010

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1999 Grand Prix GTP Supercharged 3.8L gas engine. Poor fuel economy.


did you check the lower intake manifold gaskets? they go bad on the 3800 series 2, since you have the supercharger you won't have an issue with the upper intake because it is not plastic but the gaskets may be bad as well. that engine runs best with irridium plugs.

Sep 23, 2012 | 1999 Pontiac Grand Prix

1 Answer

Why won't the clutch engage on the ac but the pulley spins fine. 1999 Grand Prix GTP 3800 supergarged


not swich on
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empty or low freon

Jun 09, 2011 | 1999 Pontiac Grand Prix

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2004 Pontiac grand prix gtp won't start- fully


You need a new starter solenoid. It is essentially a heavy duty remote switch that is activated by your ignition key switch. The solenoids get stuck or don't conduct well after 6 to10 years.

May 27, 2011 | 2004 Pontiac Grand Prix

1 Answer

1. My grand prix gtp has problems with leaking on the passenger side. I cannot locate the leak. 2. My engine runs too hot when ideling. I changed the thermostat but this did not help. I need your assi


Make sure your cooling fans are coming on when the temp heats up. Are you talking about a leak inside the car or outside? Inside is usaully a drain tube for the A/C stopped up. Outside, look for a water pump or intake gasket.

May 12, 2009 | 1997 Pontiac Grand Prix

1 Answer

2002 Pontac Grand Prix GTP P0171 code engine stumbling at times


Bank 1 is the frt side exhaust manifold (did they say bank 1 sensor 1?),you can start by replacing that sensor,i would check the intake for leaks ,the gm 6cly. are known for bad intake gaskets,you will see oil coming out form the frt or rear of the intake,also check your atifreeze overflow bottle for bronwish sludge,which means that the oil is mixing with the antifreeze.A leaking intake could cause that lean condition.

Mar 29, 2009 | 1998 Pontiac Grand Prix

2 Answers

1999 Grand Prix GTP. Catalytic convertor fine.


Make sure it always gets premium fuel...even with premium and especially in warmer weather the GTP will frequently perform the factory programmed KR (knock ******.) In WOT it is also more susceptible to running a lean condition with stock programming.
Things you can do to troubleshoot the problem and give more consistant performance with the GTP is run colder range copper core plugs and/or any brand of cold air intake, or even a stand alone 9" open element cone filter. Both are better than stock and provide more airflow even though the stock airbox was redesigned in '99. What else you can do is not limited to that but a start. Good luck.

Mar 08, 2009 | 2000 Pontiac Grand Prix

1 Answer

Remove supercharger on pontiac GTP 1999


Technically you are supposed to (change the s/c gasket) but if your careful and don't tear it, you don't really need to.

Be sure to inspect the yellow coolant o-rings.

The gasket thickness isn't going to matter at all on the supercharger gasket.

Perfect oportunity to install that Intercooler you always wanted ;)

Nov 10, 2008 | 2007 Cadillac CTS 3.6L

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