The injectors are different sizes. First you need to go to junk yard and pull the engine efi harness or complete system if you can.
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Tbi conversion wiring diagram. Basic connections are standard but it is easy to customize one for your needs. It is not too bad i would the g van harness as mentioned. It much more economical to use a factory tbi wiring harness from the wrecking yard donor vehicle or ebay. Painless wiring makes the conversion from carburetor to tbi real easy with there fuel injection wiring harness and a parts list of everything you need to make the switch. I ended up with a complete system from a 91 305 camaro for about 140. Wire harness can be pulled from the factory car and reworked for a conversion.
This is a basic tbi harness for all engines using ecm 1227747 and 1228746 type ecm many others can be used. I downloaded several pinout charts and wiring diagrams and began studying every detail. Using the pinout diagrams identify the circuits you want to keep. I can help i would hope after doing a couple now. What is covered here is generally applicable to most tbi systems but we will be putting. The 454 is larger with close to 2 inch bores.
Its also a lot of work. You must identify the connections wires youll need and get rid of the rest. I have diagrams for a 93 tbi 350 the engine conversion book from jegs that run various other wiring resources and of course my conversion as an example so let me know what you need to know and where you are on the project. Tbi wiring harness conversion. There will be a lot of extra things dont worry about them now grab it all as whole as you can. It included the tbi unit the intake manifold the ecm computer the distributor the wiring harness and most of the sensors.
A stock harness has a ton of circuits you wont need for a conversion. Typically technical support is limited to the customer with only a harness purchase due to the complexity of variables we have no control over. Generic tbi fuel injection block diagram acronyms individual components and their function schematic diagram the actual installation theory and modes of operation calibration equipment variables the subject of this session is throttle body fuel injection. It is recommended a tbi from about the same size engine to be used in your conversion or larger for high performance built engines. I jumped on ebay and starting bidding.
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