Question about 1996 Pontiac Grand Am

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Car starts fine then bogs down shuts off starts fine.Replaced fuel filter fuel pump,crank censor map sensor oxygen sensor coil packs plugs dropped cadillac converter its fine.HELP

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  • 2,101 Answers

Are there any codes ? does it back fire ?

Posted on Dec 30, 2012

  • 16 more comments 
  • Kelly Gormus
    Kelly Gormus Dec 30, 2012

    No codes yes backfires thru motor

  • teds repairs
    teds repairs Dec 30, 2012

    have you tried the ignition control module that coils is bolted to

  • Kelly Gormus
    Kelly Gormus Dec 30, 2012

    No I don't think he's tried that yet.

  • Kelly Gormus
    Kelly Gormus Dec 30, 2012

    whoops sorry yes they tried that also

  • Kelly Gormus
    Kelly Gormus Jan 01, 2013

    Anybody else got any ides?

  • teds repairs
    teds repairs Jan 01, 2013

    what about the throttle position sensor or the muffler

  • teds repairs
    teds repairs Jan 01, 2013

    what happen when this started to act up. if it is in park and idling can you give it gas ,and will it die

  • Kelly Gormus
    Kelly Gormus Jan 01, 2013

    Throttle position been replaced.Started car one morn drove to mailbox.Got back in car acted like it was gonna cut off in neutral gave it some gas acted fine whent to pull out on main road was loosing power started sputtering cut off.Started it back up tried to give it gas done it again.They replace fuel filter and fuel pump.It would start then sputter stop.Not sure what sensor they replaced at that point.It would sputter when started but once warmed up we could drive it. everytime we would start it it would sputter till it warmed up.Then it got to the point wheree its aputtering all the time.They replaced all the other stuff had it to a local dealership put on a machine and they can't figure it out.

  • Kelly Gormus
    Kelly Gormus Jan 01, 2013

    Starts fine minute or two starts sputtering and sometimes backfires cuts off.

  • teds repairs
    teds repairs Jan 01, 2013

    wow. well as I say a car is not a dart board,and there has been some thrown at it.have they tried the fuel pressure regulator. there can be fuel pressure in the fuel line ,and still have a bad fuel pressure regulator. the other thing is trying a used computer. I can get computers cheap.was any work done on the car before this happen. here is the link to my garage I am on facebookhttps://www.facebook.com/TedsRepairs .

  • Kelly Gormus
    Kelly Gormus Jan 01, 2013

    Don't know if they tried fuel regulator will ask checked on computer 200.00 but dealership says its okay not computer

  • Kelly Gormus
    Kelly Gormus Jan 01, 2013

    No car was running good drove it home from work night before it was fine

  • teds repairs
    teds repairs Jan 01, 2013

    ok I am going to put some thinking in this

  • Kelly Gormus
    Kelly Gormus Jan 01, 2013

    Thanks its got alot of our local Mechanics stumped they are gonna check ignition switch next just hate to put money in computer when they are saying i can't return it and are saying its okay

  • teds repairs
    teds repairs Jan 01, 2013

    that is why I to try a used computer. has any one pressure test the motor. the 3.1 motor and all GM motor have bad intake manifold gasket leak,

  • teds repairs
    teds repairs Jan 01, 2013

    is it the 3.1 motor or the 2.4 motor

  • Kelly Gormus
    Kelly Gormus Jan 01, 2013

    Yes they did pressure test 2.4 motor

  • teds repairs
    teds repairs Jan 01, 2013

    now the story changes with a 2.4 motor

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3 Answers

Car idles fine, but sputters, bogs and dies if gas pedal is pressed.


new spark plugs this decade. (a tune up?0
the filter is part of all 60k tuneups. letting it clog wrecks good pumps.
my wild guess, its lack of fuel flow, do to old filter.
or low fuel pressure.
car is identical to a Corolla. so is not unique or rare as some Geo cars are.
the cam belt not changes, invites valve kissing piston tops. BOOM
end of engine. (costs more to fix then worth of car)
the word is bogging, my engine bogs
if if bogs WOT (wide open throttle) and dont catch up < ITS NOT THE TPS. ever.
tps bad causes short bogs, called hesitations.
The map sensor , is what measure air flow and the ECU matches fuel to this air flow.
my guess, is it does that, but fuel pressure is like 15PSI, bad.

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