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Thread: New Guy. TBI questions and help needed.

  1. #16
    Carb and Points!
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    Got the exhaust on it. It pulles 18-19in of vacuum idled up some, or 16-17 at normal idle. It seems to be running ok at the moment.

  2. #17
    Fuel Injected! PlayingWithTBI's Avatar
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    [QUOTE]16-17 at normal idle.[QUOTE]

    That's more than I have so, I wouldn't worry about "not enough vacuum for TBI".

  3. #18
    Fuel Injected!
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    Quote Originally Posted by Fast355 View Post
    4 wire is better because it uses an isolated ground back to the ECM rather than relying on the sensor body and exhaust to ground it back to the ECM. The 02 sensor ground usually goes back to the block through the harness on a TBI.
    Out of curiosity, what would be a part number or vehicle to look up for a 4 wire O2 sensor that works with the TBI system?

  4. #19
    Fuel Injected!
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    Quote Originally Posted by c5wagner View Post
    Out of curiosity, what would be a part number or vehicle to look up for a 4 wire O2 sensor that works with the TBI system?
    Just get one for say a 1997 C1500 5.7. Upstream sensor preferably Delco.

  5. #20
    Fuel Injected! PlayingWithTBI's Avatar
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