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Couple of engine quest.

Discussion in 'The Garage' started by grindkings, Jul 15, 2005.

  1. grindkings

    grindkings 1/2 ton status

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    Alright boys, got the motor finally done today. Fired it up, runs, but sorry not pics, YET. got a couple of questions: can someone show me a picture of where the egr hose connects to. And i have a holley TBI on the motor. Is there any tuning that i need to do to the TBI?
     
  2. Mad-Dog

    Mad-Dog 1/2 ton status

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    What's EGR.....?

    Just kidding, from what i can remember i thought EGR vacuum came of the manifold so it would open during idle, part-throttle and cruise but not during WFO wind sprints.
    I'm probably wrong as i have forgotten more about emission control than i ever learned.
     
  3. k5guyva

    k5guyva 1/2 ton status

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    Certain blocks have positive gas pressure in the block.... I thought the EGR was to safely put those exhaust gases back into the intake. Maybe its not needed....

    Here is a link I found on it.
    http://www.asashop.org/autoinc/nov97/gas.htm
     
  4. grindkings

    grindkings 1/2 ton status

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    Well the motor is "sputtering" alot. Does anyone have a picture of their' EGR valve hooked up?
     
  5. Mad-Dog

    Mad-Dog 1/2 ton status

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    you're thinking of "positive crankcase ventilation",
    EGR is not needed from a performance standpoint.

    Exhaust Gas Recirculation (EGR) valve simply opens at certain times to allow burnt exhaust gas to mix with the fresh air/fuel mixture.......effectively contaminating the combustion chamber with spent gases.
     
  6. grindkings

    grindkings 1/2 ton status

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    anyone else wanna help?
     
  7. scrappy88

    scrappy88 1/2 ton status

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    There is a hose that connects to the front left side of the TBI that goes to the EGR control solenoid. Then there is a hose that connects to the back of the EGR control solenoid to the EGR valve itself.

    [​IMG]
     
  8. grindkings

    grindkings 1/2 ton status

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    just what i needed. Thanks.
    Does anyone know how to adjust a Holley TBI?
     
  9. Mad-Dog

    Mad-Dog 1/2 ton status

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    There are no adjustments, TBI is computer controlled..

    What parameters are you desiring to change.....idle speed, fuel mixture..?
     
  10. grindkings

    grindkings 1/2 ton status

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    Air fuel ratio, idle, fuel pressure. timming.
     
  11. scrappy88

    scrappy88 1/2 ton status

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    Mixture and idle are computer controlled. Although the Holley TBI does have an idle speed screw I wouldn't recommend adjusting it until you have taken all the other steps to correct an idle speed problem. It's been a while since I messed around with the Holley TBI but I *think* it has an adjustable fuel pressure regulator.. don't remember.
     
  12. dirtwarrior17

    dirtwarrior17 Banned

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    They came with a 7-21 psi adjustable regulator.

    Holley designed the pressure regulator so you have to drill a hole in the top or cap(gold/brass looking thing at top of regulator) and pull on the cap so it comes off. Then take an allen wrench and adjust until your satisfied. IIRC tighten it for more psi and loosen for less.

    Make sure you take the regulator off when you do this so you don't get shavings in the tbi.
     

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