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swaped from carb to TBI doesnt want to start

Discussion in 'The Garage' started by dougyfreshh, Nov 14, 2005.

  1. dougyfreshh

    dougyfreshh Registered Member

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    I did all the wiring manifold swap it wont start unless I pour a little gas down its throut then it runs just great accelerates flawlessly idles perfectly theres no check engine light on. does anyone have any ideas
    Thanks
    Doug
     
  2. aldrichg9

    aldrichg9 Registered Member

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    Do you have fuel pressure?
     
  3. botboy

    botboy 1/2 ton status

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    I can only assume so since he said that once it gets started it runs great.

    I can venture a few guesses though:

    1) get a scanner and see if your CTS is functioning properly...fuel dumped in at startup is largely based on how hot the ECM perceived the engine to be
    2) does your fuel pump run when you turn the key on? If not could be a wiring or ECM problem, the fuel pump should "prime" once the key is in the on position
    3) does the engine start after cranking for long enough, or do you always have to pour a little gas or use some ether?
    4) how is the injection spray pattern off the TBI?
     
  4. aldrichg9

    aldrichg9 Registered Member

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  5. southernspeed

    southernspeed 1/2 ton status GMOTM Winner

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    Make sure you wired the ecm to a live for cranking and running. Easy mistake and it'll do exactly what your saying.
     
  6. justinf

    justinf 1/2 ton status

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    Check your wiring for the injectors. Make sure they are wired to a be on when cranking and when running. It is fairly common mistake to wire them to a source that is only on when the key is in "on", not in "start".
     
  7. jays68yak

    jays68yak 1/2 ton status

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    FUEL PUMP!

    Make sure you have your fuel pump kicking on in the start and run position. I had the same issue, with fuel in the tbi it would start, but if I did not pour anything down there it would just crank. Moved the fuel pump positive wire to the fuel relay on the harness. I was bypassing it cuz atfirst I was not getting power from it. Then I figured out I didnt have the injector loop powered and when I fixed that it fixed the fuel pump relay not getting power.
     
  8. dougyfreshh

    dougyfreshh Registered Member

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    thanks guys

    thanks for all the help you guys were right on the money once again thankyou for the help

    Doug
     
  9. Cornfield creations

    Cornfield creations 1/2 ton status

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    Cool, I love orange and white color schemes. I drove a burnout machine, 76 c-20 14bFF. We called it the dreamsickle. :haha: :haha: :haha: I love those colors on anything. The coolest!
     

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