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Replace MAP sensor?

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by BrianDamage, May 18, 2002.

  1. BrianDamage

    BrianDamage 1/2 ton status

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    Location:
    Alabama
    every once in a while, my '87 350 TBI will stall out..usually when I'm idling into a parking space or something...I also noticed it would stall out easier while in 4x4 ...

    so I checked my codes today, and I got a '33'...the maual says to change the MAP sensor, but has an asterick* that says sometimes it may be necessary for a pro to check it out first.

    is there anything I can check myself, or would you just go ahead and change the MAP sensor first and see how it runs?
     
  2. yunit

    yunit 1/2 ton status

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    Location:
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    Check you vacuum lines.
    33-MAP sensor signal voltage was too high (low vacuum) for 1 second when throttle opening was under 2%.
     
  3. BrianDamage

    BrianDamage 1/2 ton status

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    Location:
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    is there a trick to checking vacuum lines? is there anything you can do besides just visually inspecting them? is there a trick that you can use that might show a hole that your eyes might not catch?
     

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