Autozone repair guide for your fuel system throttle body injection tbi system fuel injector fuel tank multi port fuel injection mfi system vg30i engine 750 850 rpm with the manual transmission in n or 650 700 rpm with the automatic transmission in d z24i engine 750 850 rpm with the manual transmission in n or 600 700 rpm with the . Vacuum leaks are the leading cause of installation issues with your fuel injection system check all sources of potential vacuum leaks including components not related to the fuel injection system there are instances where the vacuum leak is coming from the adapter plate used to attach the throttle body to the manifold. For the model 220 tbi unit install the fuel injector into the cavity by aligning the raised lug on the injector base with the cast notch in the fuel meter body cavity once the injector is aligned carefully push down on the injector by hand until it is fully seated in the cavity. 2 throttle body injection tbi the 43 50 and 57 tbis are all the same cfm with 1 11 16th bores the injectors are different sizes the 454 is larger with close to 2 inch bores it is recommended a tbi from about the same size engine to be used in your conversion or larger for high performance built engines 3 tbi wiring harness. Efi tbi system on ls engines 1 install the four manifold flange studs item 9 into the intake manifold install the throttle body gasket item 8 between the manifold and the 4 barrel throttle body injection unit check for sufficient thread engagement of the throttle body hold down studs and nuts danger
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