Question about Pontiac Grand Prix

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Hi i have a 93 pontiac grand prix that i ahve replace everthing on and still nothing above idle (tps, egr, intake gaskets, tb, cataltic converter, computer, did full tune up , fuel pump, fuel filter , and some relays..... cant to save my life seam to get anything to work

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  • micey72 Jul 04, 2010

    great help by ledsled alot of help and apprecaition

  • micey72 Jul 07, 2010



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At idle the engine runs fine? If the accelerator pedal is pressed, then what happens? I just need to clarify your condition.

Posted on Jul 03, 2010

  • 12 more comments 
  • micey72 Jul 03, 2010

    k will runs k when idle when the accel is pushed the first it will come up on rpms a little then drop and get rough it will stay runnning but bearly and then die out (not able to be drivin) i have also cleaned out the fuel rail and the tips of injectors

  • GetMeOttaHere Jul 03, 2010

    Do you have the OHC or double OHC engine. when you say tune up, was the spark module replaced also. I suspect weak spark.

  • GetMeOttaHere Jul 03, 2010

    Is there any trouble codes stored in the PCM memory?

  • GetMeOttaHere Jul 03, 2010

    How many miles are on the vehicle?

  • micey72 Jul 03, 2010

    k brand new plugs ingnition modul;e and wires coil pack and pcv valce it is the 3.1 liter engine not sure if it is dohc or sohc btu i belive it is double ohc high milige 150,000

  • micey72 Jul 03, 2010

    none other than tps weak signal when it is running rough for about ten min than it comes on the dreaded ck engine light but i have since cleared codes and none have come back

  • GetMeOttaHere Jul 03, 2010

    What was the code that was cleared? It seems everything that would cause this problem has been replaced. Is it possible the timing belt jumped a tooth?

  • GetMeOttaHere Jul 03, 2010

    Here is another thing I forgot about. Although you have an earlier year, I can not confirm your year does not have this may just.

    Click this link;

  • micey72 Jul 03, 2010

    k well all codes have been cleared there is a sol or valve type thing on top of the tb is that a possabillity

  • micey72 Jul 03, 2010

    also one thign i forgot to metion is that the car wil remaine running even after i press on the gas is it poss abily that the fuel pressure reg is faulty and not keeping the pressure up where it needs to be for long enough to do much more than idle and very little throllle for more than two sec

  • GetMeOttaHere Jul 04, 2010

    It is the fuel pressure regulator, I assumed the fuel pressure was ok and constant.

  • micey72 Jul 04, 2010

    k so that seams to be very good and consectant advice i will go after that on the next few days on this modle it is betweeen the two fuel rails right

  • GetMeOttaHere Jul 04, 2010

    We were not sure of the engine type, but it should look something like this;

    You should test the fuel pressure first, and be sure it maintains pressure.

  • micey72 Jul 04, 2010

    yes it kinda looks something like that it is a 3.1 multiport fuel injection six cylinder sixinjectors


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