Hissing sound after turning engine off

Discussion in 'High Tech Retrofits' started by 75Maro, May 5, 2019.

  1. badazz81z28

    badazz81z28 Veteran Member

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    Is the engine stock? Did you get a tune with the best pvc routed the way it was? The problem may be is the car was tuned with a vacuum leak if nothing was on the throttle body. Now that all the leaks are fixed, it’s not running good? Is the idle correct in park?
     
  2. 75Maro

    75Maro Veteran Member

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    engine has a small cam in it. The PCM was tuned out of the vehicle and its just a "start up" tune. The idle is erratic in park or neutral and fine in reverse or drive. I disconnected the batt to see if PCM maybe needs to relearn idle/fuel trims without the vacuum leak?
     
  3. badazz81z28

    badazz81z28 Veteran Member

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    I would double check all the coils and connections. Make sure everything is secure. If all is good, I would be looking at the tune. What trans?
     
  4. 75Maro

    75Maro Veteran Member

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    4L60E
     
  5. badazz81z28

    badazz81z28 Veteran Member

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    How did it end up?
     
  6. 75Maro

    75Maro Veteran Member

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    Seems to be running fine IDK maybe just had a fart stuck
     
    dave@ztech likes this.

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