Question about 1999 Pontiac Grand Prix

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1999 pontiac grand prix . will not run

Got service engine soon light two weeks ago , auto zone checked code , said low signal mass air flow sensor , I wiggled a wire light went out , yesterday light came on again , checked connections again , light went out , engine ran fine , about 40 miles later engine misfired and ran very rough , would not start again . Replaced mass air flow sensor per instructions , still won't start. Towed to local shop , they checked fuel pressure-ok,coil pack -ok, original mass air flow sensor signal out put is ok , plugs are firing . Engine turns over great but will not start and run , Any ideas ?

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  • jnsfarms Jul 17, 2008

    same car...same problem, but mine hasn't completely quit running yet! I can crank it over in short bursts & then it will start & run ok. wont tac over 4 grand & sounds like #$%^ when you rev it up. same car has major issue with the tac & traction control...

  • jmende Jul 22, 2008

    Yeah I have the same problem, mine still runs. When you took it to auto zone the error code was a p0102 the othe half of that code refers to the vacuum lines check that. I am in the midst of purchasing the MAF sensor and replacing it myself.

  • stephb_2005 Oct 25, 2008

    I have a 2003 grand prix, and my service engine light came on for the same error codes. When I had something fixed with the coolant leaking, the mechanic replaced the MAF and vacuum, but the service engine light came on soon after I left the mechanics. Today, it revved while I was slowing to park, then it shut off. If anyone has any solutions, then let me know please!

  • Anonymous Mar 13, 2014

    check engine light on and truck wont go pass 60 mph autozone read it was mass air flow sensor replaced and still don't work

  • Anonymous Mar 14, 2014

    Checked out under the hood for vacuum leaks(none) and checked fuel flow at engine side of the fuel filter(flow was good also chcked tps an mass air flow runs good at low rpm but seems real slow to accelerate an wont rev over 3800 rpm

  • Anonymous Mar 17, 2014


  • Anonymous Mar 21, 2014

    Mass Air Flow sensor needs to be replaced. Can I unplug it or spray with the cleaner??

  • Anonymous Mar 25, 2014

    ran great then one morning it will turn over, but not start. we jumped it, replaced starter, replaced coil pack, pressure test the fuel and sprayed starter fluid into the air breather. we used a code reader, but nothing came up. it has 162k miles. the night before it went belly up, it had snowed 6 inches and it started fine to remove the snow. the next morning the wind chill was -27 degrees and it wouldnt start

  • Anonymous Mar 25, 2014

    Replace the cam position sensor and the car ran fine for a couple of days....check engine light went out but came back a few days later. When I change the sensor I noticed there was oil in the port.

  • Anonymous Mar 26, 2014

    I have a 2000 about 32 deg outside. When I first start it it splitters an coughs. Once it warms up or you drive it, it's fine. I can park it come back hours later and if it hasn't completely cold down its fine. Had the mass air flow sensor replaced ran good for about 2 weeks then started doing it again

  • Anonymous Mar 30, 2014

    when I received it it was a gallon low on transmission fluid I filled it and found it needed a plug it ran fine for 2 days then it said speed sensor I found the wire had been severed and repaired it it ran fine once again all lights went out about 3 days later the light came back on so I replaced the speed sensor this ran fine for about 2 weeks then the transmission required 6000 to 7000 rpm to get it to move what do you suggest I feel thers most likely a leak somewhere and I have lost fluid again



2 Answers

If wiggling the wires cured the code, then one of the wires is broken inside the insulation. Pull on each wire one at a time. look for the colored insulation to stretch, this will be the broken wire. For the other car that wont rev up, this is a common when the catalytic concverter is plugged up. This will also cause MAF codes, and in turn, TRAC OFF light.

Posted on Oct 17, 2008

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If you unplug the MAF sensor it should run using the default mapping. I'm having the same problem, but I want to figure out why it won't run with the sensor connected.

Posted on Sep 08, 2008


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2003 Nissan Altima 2.5L Service Engine Soon Light is on, Auto Zone says codes are for MAF and O2 Sensors. Car hard to start after driving a while but when starts appears to run smooth. Auto Zone thi

ok lets start with the codes they say your getting. P??? which 1's and how many. there are few o2 sensors, are they next to the Exhaust next to the converter? MASS AIR FLOW -MAF use this, for now i am guessing, until i see the correct codes your are getting. this could be the 1 you may have below, please read it........
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Feb 22, 2013 | 1997 Pontiac Grand Prix

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- Dirty mass air flow sensor
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Before replacing the mass air flow sensor, try replacing the air filter and cleaning the air flow sensor with low compress air or mass air flow sensor cleaner. Reset code and drive vehicle. If the code comes back, it may be necessary to replaced the mass air flow sensor.

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