Question about 2000 Pontiac Montana

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2000 montana 3400 engine,code p302 number 2 cylinder,replaced module,,one coil,new plugs,and wires.Miss occurs,then will clear,and come right back,compression good,spark,and injector pulse good.Sometimes after it goes a way ,does not come back until key is turned off,and right back on.

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  • Ronny Bennett Sr.
    Ronny Bennett Sr. Jul 04, 2010

    The text I give you had that the code was p302 number two,tps has nothing to do with cylinder miss fire,and no other sensors do either,go back to the drawing board,learn your pros,and cons,and I also mentioned the ignition module was also replaced,sorry,no go here,I can not even rate.You will have to do better than this to become a guru.

  • Ronny Bennett Sr.
    Ronny Bennett Sr. Jul 05, 2010

    I will let you know,I believe I am going to find out the valve springs are weak on that cylinder,but not threw testing yet.

  • Ronny Bennett Sr.
    Ronny Bennett Sr. Jul 05, 2010

    If I had more than one miss,I would think ,sensors,but it is just one,and it only does it 50 to 60 percent of the time.

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

    I solved the problem myself,the new coil pack ,I had purchased(eclin)was defective,it was not producing enough voltage to the spark plug. flbergeron68 did not read the post(the problem) sounded like he just threw some things out there,and did not read the post,I had already posted what had been done to the vehicle,in other words,he was telling me to test everything I had replaced,and some had nothing to do with the cylinder missfire,

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  • Master
  • 541 Answers

Ignition control module, throttle position sensor and other sensors need to be tested to establish problem, any codes from OBDII ? check engine light staying on ?

Posted on Jul 04, 2010

  • Fernand Luc Bergeron
    Fernand Luc Bergeron Jul 05, 2010

    let me know when you find the solution, i already had that problem on a 4.3 astro van and solved it by testing and replacing sensors for about 100$. the garage wanted to change the injectors for 1,300$ . it runs like a race car now, you be the judge !

  • Ronny Bennett Sr.
    Ronny Bennett Sr. Nov 13, 2010

    fibergeron,this is not a astro van,and it is not a 4.3,and sensors are not gonna fix the problem,you need to go back to school

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