Question about Pontiac Grand Prix

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Hey ws talking to u earlier the tps is in the right place btu not sure where to go from here i let it run for about five mins and now it wont restart ?????????????? at such a loss

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  • Pontiac Master
  • 6,826 Answers

I think I would be looking at the timing,what engine is it?Check the cam sensor,and crank shaft sensor,these tow,most likely the crank sensor.

Posted on Jul 05, 2010

  • 57 more comments 
  • micey72 Jul 06, 2010

    cranksensor dos it control the est or not it is the 3.1 lit gm engine

  • Ronny Bennett Sr.
    Ronny Bennett Sr. Jul 06, 2010

    Crankshaft sensor only sends on time signal to computer,that is all,but it sounds like the timing chain has jumped,you need to tear it down to check,but that is what it sounds like to me.see if it is still firing,if so,check the spark plugs to make sure they are not fouled,but you need to tear down the front of the engine to check the timing chain.

  • micey72 Jul 06, 2010

    i know the timing has not jumped by the fact of only alowing the engine to stay of for a sec and then it fires back up again than will stay running i belive u told me it a\was the est that was possably breaking down in the ignition module so that would make sence also if the crank position senser it part of that it could be possable is ther any way to jump the est to check if that is it

  • Ronny Bennett Sr.
    Ronny Bennett Sr. Jul 06, 2010

    No,there is not,have the module tested,if the timing has jumped,it can run,but not very good,and not past idle,cause the acceleration causes timing advance,and if it is not there it will die.You did make sure the lever on the tps was moving with the throttle ,,,right?

  • Ronny Bennett Sr.
    Ronny Bennett Sr. Jul 06, 2010

    How many miles on the car?

  • micey72 Jul 06, 2010

    there is 150000 but the timming chain\belt which ever it has has been replaced just 5000 miles ago

  • Ronny Bennett Sr.
    Ronny Bennett Sr. Jul 06, 2010

    Tell me,what have you replaced?And what recent parts have been changed out?How about the coolant sensor,has it been changed?

  • Ronny Bennett Sr.
    Ronny Bennett Sr. Jul 06, 2010

    The coolant sensor has two modes,cold,and hot,these direct spark,and fuel inputs to the ecm,if one of the modes is not working,then this could be the problem,after warm up,now it will not start,right>Check for spark,and check for injector pulse.

  • micey72 Jul 06, 2010

    i guess it is posssable but i have replaced the ecm the coilpacks the ign mod the egr the cat the tps cleaned the tb i ahev also replaced verios relays thermostat the fuel pump and filter the wirers the plugs the hot wire going to the fuse box man what have i not hit hum the crank pos sensor which i cant find and the cam sensor cant find oh yea i have inspected the fuel injtors and presure reg hoklding @40-45 psi there is spark and fuel even when it doesnt start and i have replace dthe map without any differantce

  • Ronny Bennett Sr.
    Ronny Bennett Sr. Jul 06, 2010

    Ok,what year is it again?

  • micey72 Jul 06, 2010

    it is a 1993 pontiac grand prix with a 3.1 lit v6 automatic trans but nothing spec....

  • Ronny Bennett Sr.
    Ronny Bennett Sr. Jul 06, 2010

    The cam sensor looks like this,it could have one,or the other.

  • micey72 Jul 06, 2010

    what either a cam or a crank sensor is it possabily this could cause my prioblem? this all started after i massed on the gas and the car acted as if it was running out of fuel and stalled but i have double checked the timing and it is right on

  • Ronny Bennett Sr.
    Ronny Bennett Sr. Jul 06, 2010

    If this model has the crankshaft sensor behind the crank(harmonic balance)this would not have a cam sensor,the crankshaft sensor does it all,and yes,you have about narrowed it down to the crankshaft sensor,seeing the timing is fine,it would almost have to be the crank sensor,but answer this,when you put the tps,back on,was the lever on the tps positioned to where the throttle would move the tps?if the tps is not moving,this will be the problem.

  • micey72 Jul 06, 2010

    yes but i will go back out and check again

    how would i find out if i have one it is not visable from the out side or is it and should i be able to see it from not pulling the balencer

  • Ronny Bennett Sr.
    Ronny Bennett Sr. Jul 06, 2010

    Yes,you will be able to see the crank sensor if it is behind the balancer

  • micey72 Jul 06, 2010

    k is there any way to test it before replacing it?

  • Ronny Bennett Sr.
    Ronny Bennett Sr. Jul 06, 2010

    No,not realy,but sometimes the relucter on the inside of the harmonic balancer will start hitting it and destroy it,but the crank sensor and the harmonic balancer also.But the crank sensor causes the engine to fire,and pulse the injectors,but if it is not working correctly,it will act like it is out of time,or will quit all together.

  • Ronny Bennett Sr.
    Ronny Bennett Sr. Jul 06, 2010

    Please check the tps,to make sure it is moving with the throttle,if it is not,this will be the problem.

  • micey72 Jul 06, 2010

    k i will right now be back in a few

  • micey72 Jul 06, 2010

    k i have reinstalled the tps in the correct manner hoping i have placed it in the wrong spot but wont know if it is untill tomarrow to late



    also dont see crank position sensor behind the hb

  • micey72 Jul 06, 2010

    i just did a parts search and no crank position sensor was avil

  • Ronny Bennett Sr.
    Ronny Bennett Sr. Jul 06, 2010

    OK,this means the engine has a crankshaft sensor in the block,on the inside toward the firewall,and it is in the front,the crank sensor goes in the block.Sense the engine was running,I would say the crank sensor is the problem.Now on the tps sensor,when you look at it tomorrow,it should move,when the throttle moves,look at the lever on the tps,it should move when you move the throttle.Let me know tomorrow,going to turn in now.

  • Ronny Bennett Sr.
    Ronny Bennett Sr. Jul 06, 2010

    It will look like this,but you wont see the long shaft on it cause it is in the block

  • micey72 Jul 06, 2010

    k what do i look for on the block to find the cps

  • Ronny Bennett Sr.
    Ronny Bennett Sr. Jul 06, 2010

    It will have one screw holding it in,and a long wire going to it,you will know it when you see it.

  • micey72 Jul 06, 2010

    k thanks will let u know what i find if this doesnt fix it what else could it be

  • Ronny Bennett Sr.
    Ronny Bennett Sr. Jul 06, 2010

    We will cross that bridge when we get to it ok? talk to you tomorrow.

  • micey72 Jul 06, 2010

    thanks again for ur help i will replan\ce tomarrow i found it ill try it

  • micey72 Jul 06, 2010

    hey good morning once again thats not it however it did run great for a matter of two minutes but now right back to the orginal

  • micey72 Jul 06, 2010

    one more thing not sure if it matters but i had added engine restore to the oil the last time i changed the oil can that make the crank sensor send a faulse sigle

  • micey72 Jul 06, 2010

    have to get ready for work no ill check back later

  • Ronny Bennett Sr.
    Ronny Bennett Sr. Jul 06, 2010

    flush will not effect crank sensor,unless the sensor has a crack in it

  • micey72 Jul 07, 2010

    k just started the car and it seems to be alot better when it is cold but when the car starts to rize in temp it seems to get worst to late to keep running so i will double check tomarrow

  • micey72 Jul 07, 2010

    i also have a low coolant light on

  • Ronny Bennett Sr.
    Ronny Bennett Sr. Jul 07, 2010

    Remove the low coolant sensor,and clean it,then replace the coolant sensor,this maybe the problem,it effects the running of the engine .

  • micey72 Jul 07, 2010

    really no way didnt know that... is the location of that in the same spot as the coolant sensor

  • Ronny Bennett Sr.
    Ronny Bennett Sr. Jul 07, 2010

    It will be on the radiator,most likely on the passengers side,held in with a clip,remove the clip with a pick,but do not loose it,and blow it out,it will have build up in it,then put the clip back on,and snap it back on.

  • Ronny Bennett Sr.
    Ronny Bennett Sr. Jul 07, 2010

    If you have not replaced the coolant sensor already,it would be a good idea to,did you check the tps,to see if it was moving with the throttle?

  • micey72 Jul 07, 2010

    yes and that is good

  • micey72 Jul 07, 2010

    u said it would b located in the radiator on the pass side

  • Ronny Bennett Sr.
    Ronny Bennett Sr. Jul 07, 2010

    I assume it is,not sure on that model,but it will be in the radiator.

  • micey72 Jul 07, 2010

    k stay withj me brb i will go look to see if i can find

  • micey72 Jul 07, 2010

    k well there is not any sensor in the rad is it possabal that it could be in the thermostat housing the raad in my car sits lower than the toop of the engine

  • Ronny Bennett Sr.
    Ronny Bennett Sr. Jul 07, 2010

    Look in the coolant reservoir

  • micey72 Jul 07, 2010

    tryed that to no sensors just a overflow hose

  • micey72 Jul 07, 2010

    yes i will check this tomarrow and let u know night

  • Ronny Bennett Sr.
    Ronny Bennett Sr. Jul 07, 2010

    This is wht


    TT


  • Ronny Bennett Sr.
    Ronny Bennett Sr. Jul 07, 2010

    I sent you a picture of it,according to my information,it is in the radiator somewhere.

  • micey72 Jul 07, 2010

    oh **** i thought this had to do with something else yes i saw that now i know

  • Ronny Bennett Sr.
    Ronny Bennett Sr. Jul 07, 2010

    This is the coolant level sensor for your car according to my information,and it is in the radiator somewhere.Look real good,cause it sets flat against the radiator.

  • micey72 Jul 07, 2010

    k ifound it i will try to clean it tomarrow long day thanks for ur help again

  • micey72 Jul 07, 2010

    k cleaned the low coolant sensor and put back in now no coolant light however it is still not running correctly ran again for five min and not re starting

  • Ronny Bennett Sr.
    Ronny Bennett Sr. Jul 07, 2010

    have you changed the coolant sensor yet?

  • micey72 Jul 07, 2010

    can u find me a location of the camshaft sensor

  • micey72 Jul 07, 2010

    no i guess i should change it

  • micey72 Jul 07, 2010

    i dont belive it has a camshaft sensor

  • Ronny Bennett Sr.
    Ronny Bennett Sr. Jul 07, 2010

    Just the way you descibe the symptoms,I would change the coolant sensor

  • micey72 Jul 07, 2010

    K I WILL ORDER A NEW ONE NOW AND REPLACE IT

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