Base Timing for 1994 TBI

Discussion in 'Engine Performance + Maintenance' started by Connor Fischer, Jan 3, 2017.

  1. Connor Fischer

    Connor Fischer Newbie

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    So I just finish building a 1994 350 tbi I used a rv style camshaft with 204/214 duration @ 50 with vortec heads and and carb intake 9:1 compression. I'm having trouble getting it to run decent and I think it's a timing issue right now I'm at 5* advance at TDC with the computer disconnected. Should I go higher or is the computer just going to back it down when I hook the wire back up?
     
  2. 90halfton

    90halfton I'm Awesome

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    The computer may not like the things you have done.
     
  3. jkeaton

    jkeaton I need a beer.

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    Yes the computer will put it back where it's supposed to be for stock. May need a custom tune.
     
  4. sntrym

    sntrym OBS Enthusiast

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    With that cam you'll need a custom tune. I've used tbichips.com with success, other vendors are out there as well.
     
  5. Connor Fischer

    Connor Fischer Newbie

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    I'm working on getting a custom tune done by a buddy but for right now I'm just trying to get it drivable I know people have put bigger cams in With a stock computer and made then run enough to be able to drive. Has anyone done anything like this cam wise that has a good idea of where to time it?
     
  6. L29Sub

    L29Sub Newbie

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    Are any codes set? How did the engine run before mods? Whatever codes appear may reflect odd fueling related to cam
    heads-intake-intake port match-etc.
    Are all engine sensors returned and correctly wired?
    Look at O2 sensors and cam position sensor for data and codes. Any incorrect sensor will set a code.
    Firing order correct...plug wires?
    Cam may be mistyped. Cam may want more fuel than your maps allow, creating lean condition. Fuel ratios are visible on each bank with a scanner. Once you see O2 data you can chase some of your problems.
    Not sure about small blocks, but Vortec heads don't easily interchange on BB.
    Are you running an automatic?
    As stated, the ecm will attempt to return the timing to factory settings...if it can do so.
    Leave any rags in the intake or heads? ,o)
     

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