Question about 1999 Pontiac Grand Prix

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How come my 99 grand prix is sucking the gas...Can't figure it out...I put a new master air flow sensor on and still nothing. THERE ARE NO LEAKS....there are no codes...I've had it checked by mechanics twice and no one can figure it out! PLEASE HELP!

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Must hook up a good scanner & drive around & ck all engine functions,by scanning all ,,fire-ring ,fuel,temp reading map readings,o2..ect....

Posted on Feb 01, 2010

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1 Answer

99 gp gt supercharged,changed battery,cranks will not start


try unplugging mass air flow sensor on plastic duck coming from the air filter if starts up now u need new mass air flow sensor

Feb 25, 2014 | 1999 Pontiac Grand Prix

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Why does my 99 pontiac grand prix gtp supercharge keep stalling


I would check the idle air control valve before replacing anything.
The computer regulates the idle speed by controlling the amount of air entering the intake thru the throttle body.
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Is the check engine light on ?

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My grand prix may be sucking too much air


So have you checked for a vac leak ?
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99 Grand Prix idles funny, dies got code p0102,


this vehicle most likely has a mass air flow sensor it may have got accidently unplugged or the air tube from mass airflow to engine is not connected well or it could be that you have indeed a bad mass air flow sensor they do make a special cleaner that you may want to try before purchasing a mass air flow sensor or purchasing one from salvage yard the symptoms you describe would be created by a bad massair flowsensor

Mar 25, 2010 | 1999 Pontiac Grand Prix

2 Answers

Location of mass air flow sensor, 2000 Grand Prix GTP


Hi:
The mass air flow sensor is a round sensor that is mounted in the air intake, between the air cleaner box and the engine throttle body.

Feb 07, 2010 | 2000 Pontiac Grand Prix

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99 Pontiac Grand Prix. When car slows down or


There are SO many things that could be to blame, such as a relay sticking in the Engine Management System, which controls fuel cut-off on deceleration, for example.

Have you changed the fuel filter yet?
If it's the original on a 99 model and a previous owner has run the tank dry, it will have sucked dirt into the filter.

Otherwise, the fuel pump may not be working efficiently.
Does the engine sound ok and maintain steady revs, around 850/900rpm when it's started up?

Nov 17, 2009 | 2000 Pontiac Grand Am GT

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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

1999 Pontiac Grand Prix intermittent problem runs rough


i have had two of these problems both on grand prix's , both turned out to be a mass air flow meter. but nethier set a code for the sensor.

Mar 29, 2009 | 1999 Pontiac Grand Prix

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