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  1. #1
    RIP EagleMark's Avatar
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    Usually a cam change from stock lowers vacuum at idle. For the Fueling VE table it means less fuel at idle and because of more cam... more fuel mid and upper RPM. There's also a lot that can be done to spark curve.

    Open loop will usually run 128 BLM until CL feedback, problem with yours is it is maxed out rich = taking away fuel. 108 is max.

    Bottom line is the cam change is going to need a chip change to run correctly.

    1990 Chevy Suburban 5.7L Auto ECM 1227747 $42!
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  2. #2
    Carb and Points!
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    Quote Originally Posted by EagleMark View Post
    Usually a cam change from stock lowers vacuum at idle. For the Fueling VE table it means less fuel at idle and because of more cam... more fuel mid and upper RPM. There's also a lot that can be done to spark curve.

    Open loop will usually run 128 BLM until CL feedback, problem with yours is it is maxed out rich = taking away fuel. 108 is max.

    Bottom line is the cam change is going to need a chip change to run correctly.
    I kinda figured that I would need to thats how I ended up here!....based on looking at the data what should be changed first?

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