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School me on TBI in my 91 K5

Discussion in 'The Injection Section' started by 84CUCV, Jul 25, 2006.

  1. 84CUCV

    84CUCV 3/4 ton status Premium Member

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    Well, how does it work? Not sure at all. Is there a way to give me a run down? also, some pros and cons would be great as well. thx
     
  2. stkcode

    stkcode Registered Member

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    Pros....

    - Can run at steep angles
    - Can adjust for elevation changes (advance/retart timing)
    - Better cold engine starts
    - Slightly better fuel economy
    - No more vapor lock
    - Small improvement in power (not much)
    - Cheaper than mpfi (to convert to / modify)

    Cons....

    - Harder to limp home on, depending on what goes on early retirement (sensors, fuel pump, etc.)
    - Can be harder to diagnose a bad sensor, as another circumstance maybe creating the false readings.
    - Not as efficient as mpfi, since fuel still atomizes in the intake like a carb.
    - OBD is not as nice as OBD II
    - Still uses mechanical distributor/throttle linkage (can't bump the timing as quickly/easily as with newer motors)
     
  3. 84CUCV

    84CUCV 3/4 ton status Premium Member

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    What is ORD and MPFI? thx
     
  4. stkcode

    stkcode Registered Member

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    As I recall, OBD stands for On Board Diagnostics.

    MPFI stands for Multiport Fuel Injection, where their are one injector per cylinder, located in the intake, generally fed from 2 fuel rails (one per side). The throttle body in MPFI acts as an air valve.

    You may wish to visit:

    http://en.wikipedia.org/wiki/Fuel_injection
     
  5. GMCJason

    GMCJason 1/2 ton status

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  6. 84CUCV

    84CUCV 3/4 ton status Premium Member

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    thx guys
     

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