Question about Pontiac Trans

1 Answer

I have a 91 trans am.....can a bad coil make it bog down when u accelarate?

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  • 11 more comments 
  • Andrew Hart
    Andrew Hart Apr 24, 2010

    i have changed fuel pump and filter....i have 45psi fuel pressure....i have changed map sensor and idle sensor all plugs are fireing....i cant figure wat the hell the prob is....it idles rough and when i give it gas it bogs down

  • Andrew Hart
    Andrew Hart Apr 24, 2010

    yes its port fuel injection...and no the distibitor is not near the water pump its on top of the engine in the back...its got a brand new caytilac converter on it,,distribitor is brand new computer is brand new

    everything on it almost is brand new...and i still cant figure out the prob

  • Andrew Hart
    Andrew Hart Apr 24, 2010

    the throttle sensor...im loosing vaccumm from pvc valve when i accelatrate

  • Andrew Hart
    Andrew Hart Apr 24, 2010

    nope no codes...

  • Andrew Hart
    Andrew Hart Apr 24, 2010

    i have checked it its good

  • Andrew Hart
    Andrew Hart Apr 24, 2010

    well i checked the wire to the knock sensor its getting fired to it.....i guess it still could be bad im goin to go get a new 1 now be back later i will let u no.......i have already checked the regulator and the return line tho so i guess it could be a bad knock sensor...thnx...i will accept the answer after i check the knock sensor...if that aint it then i will write u back...thnx

  • Andrew Hart
    Andrew Hart Apr 24, 2010

    are u still on?i took the knock sensor out and water poured out wat could this be?and i got a code...est circut low voltage......wat is this?

  • Andrew Hart
    Andrew Hart Apr 24, 2010

    ???? wat

  • Andrew Hart
    Andrew Hart Apr 24, 2010

    thats wat i changed....and water poured out of it.....and i got the code for est low cuircut....wat is that and how do i change it

  • Andrew Hart
    Andrew Hart Apr 24, 2010

    lower part of the block in front of the starter....iam 100 percent thats the knock sensor...thats the first 1 i have changed with water in it...why is this?and wat is the est and how do i check it

  • Andrew Hart
    Andrew Hart Apr 24, 2010

    it has four on 1 side and two on the other....and then on the oppsite side it has 2.....do u have any idea were the est would be locacted?and would this make the enigine bog down

  • Andrew Hart
    Andrew Hart Apr 24, 2010

    this could be making it run like this?it has a brand new engine moduale on it......im done working on it for today thnx i dnt see anywere were i can accept the answer.......thanks for your help im goin to check the est 2mro if that could be makin run like that.....the code never popped up for that before till now and i have been working on this car for 2weeks now trying to figure wats wrong

  • Andrew Hart
    Andrew Hart Apr 24, 2010

    thanks nd yes ussally the page says accept the solution or ask another rep...but all it is saying is add comment

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  • Pontiac Master
  • 6,826 Answers

Very doubtful,have the fuel pressure checked,and change the fuel filter,when you pull the fuel filter,blowing threw it by mouth can tell you if it is restricted at all,it should not be hard to blow threw,if it is ,that is the problem,run some codes on the system,and see what the codes are that are stored in the computer to see if this will help narrow the problem down.

Posted on Apr 24, 2010

  • 18 more comments 
  • Ronny Bennett Sr.
    Ronny Bennett Sr. Apr 24, 2010

    91 model is split,is it port fuel injected?and has it a distributor,and is the distributor near the water pump on this model?

  • Ronny Bennett Sr.
    Ronny Bennett Sr. Apr 24, 2010

    Any codes in the computer?If so,what where the codes?

  • Ronny Bennett Sr.
    Ronny Bennett Sr. Apr 24, 2010

    Did you change the throttle position sensor,or the idle air control?

  • Ronny Bennett Sr.
    Ronny Bennett Sr. Apr 24, 2010

    It is normal to loose vacuum on acceleration,now,is there any codes?And does the engine run rough?

  • Ronny Bennett Sr.
    Ronny Bennett Sr. Apr 24, 2010

    There is a knock sensor,on the right side of the block,down low,but above the oil pan,looks like a bell,with one wire going to it,it is a green wire,check the connection to it,and tell me when you have checked it.

  • Ronny Bennett Sr.
    Ronny Bennett Sr. Apr 24, 2010

    Check the return line to the tank,and the fuel pressure regulator,if it does not allow the fuel to return to the fuel tank,the engine will bog down bad,plus check the timing,and the est module if equipped,some are built into the ignition module,also,how did you check the knock sensor?If the knock sensor is bad,it will bog like a big dog!

  • Ronny Bennett Sr.
    Ronny Bennett Sr. Apr 24, 2010

    OK,let me know.

  • Ronny Bennett Sr.
    Ronny Bennett Sr. Apr 24, 2010

    That is not the knock sensor,it does not fit in a whole with a water jacket.

  • Ronny Bennett Sr.
    Ronny Bennett Sr. Apr 24, 2010

    this is what it looks like

  • Ronny Bennett Sr.
    Ronny Bennett Sr. Apr 24, 2010

    I sent you a picture of it,and the knock sensor does not screw into a hole with a water jacket,the hole it screws into has a bottom in it,where is the part located you removed?

  • Ronny Bennett Sr.
    Ronny Bennett Sr. Apr 24, 2010

    Some one has bored out the hole,into a water jacket,or it is in the wrong place,the est module is a dealer part,if it is separate on the engine,it is mounted all by itself,it is flat,and has a 3 inch flat plug connected to it,the est module is most likely built into the module on this module,how many pins does the ignition module have?

  • Ronny Bennett Sr.
    Ronny Bennett Sr. Apr 24, 2010

    this is the module,it is mounted somewhere on the fire wall or on a bracket near the valve cover on passengers side,but the ignition module also has a by pass for this in the distributor,it could be either one of the parts that are bad.

  • Ronny Bennett Sr.
    Ronny Bennett Sr. Apr 24, 2010

    This est module is the advance of the timing,this is what gives the engine power,so yes this is the problem,but it can be the ignition module also,they work together,the ignition module has the by pass in it,it may not be working,or it can be the est module,napa can test the module for you to make sure before you order the est module,I have replaced about 10 est modules in my life,and only one of them was the problem,it ended up being the ignition module on most of them,and the others it was the ignition module,and the pick up coil in the distributor.

  • Ronny Bennett Sr.
    Ronny Bennett Sr. Apr 24, 2010

    Did you get the picture of the est module?

  • Ronny Bennett Sr.
    Ronny Bennett Sr. Apr 24, 2010

    Sometimes the computer will have to notice the problem a lot of times to set the code,but If I was any help,please let them know,thank you,just follow the directions on the page,Thank you and You have a good knowledge of automotive,you will get her going,I am sure the est module will solve the problem for you.

  • Ronny Bennett Sr.
    Ronny Bennett Sr. Apr 24, 2010

    If it is not done,it will accept on it`s own in 7 days.

  • Ronny Bennett Sr.
    Ronny Bennett Sr. Apr 24, 2010

    Thank you,and use us again.

  • Ronny Bennett Sr.
    Ronny Bennett Sr. Apr 24, 2010

    You have already pressed accepted thank you.

  • Ronny Bennett Sr.
    Ronny Bennett Sr. Apr 26, 2010

    This is very complicated on this car but the esc,or est module is on the vin e the vin f model it does not have one,if it was there it would be behind the distributor on firewall towards the passengers side a bit..the knock sensor either has the white connector,or the black connector on it,the white is for vin e,and the black is for vin f,,I have some schematics,when I get home I will send them to you if needed,let me know when you get this info

  • Ronny Bennett Sr.
    Ronny Bennett Sr. Apr 26, 2010

    Hello,are you there?Did you get my message?Do you understand my message?

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