Question about Pontiac Bonneville

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I have a 93 bonneville that cranks but won't start. fuel pressure is good have a good hot spark have new fuel pump.throttle position sensor. crankshaft position sensor spark plugs. i havecleaned the mass airflow sensor. when it is cranked it coughs and then nothing

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  • rptorg Oct 13, 2010

    i will try first thing in the morning if it works you have a new customer and friend thanks

  • rptorg Oct 15, 2010

    i tried the mass airflow sensor with no change in condition. further looking found a shorted wiring harness from the camshaft position sensor. thanks anyway

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  • Master
  • 1,450 Answers

Try un plugging mass airflow sensor and see if it cranks and idles sounds like you have a bad mass airflow. do you have access to a scan tool to see data?

Posted on Oct 13, 2010

  • 1 more comment 
  • TripleTauto
    TripleTauto Oct 13, 2010

    if vehicle runs with sensor unplugged most likely it is defective. just because you cleaned it does not rule it out.

  • TripleTauto
    TripleTauto Oct 13, 2010

    ok let me know how it works for you.

  • TripleTauto
    TripleTauto Oct 15, 2010

    glad you found it it is hard to diagnose sometimes over the computer.

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