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Coolant Temperature Sensor

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In order to get the TBI system to work you’ll need to run a coolant temperature sensor since the ECU uses a reference voltage from it to adjust the fuel mixture. The ignition control module on the right needs to be wired up to the distributor in order to deliver a pulse signal to fire the injectors. If the reference voltage from a GM pick-up coil doesn’t match your distributor’s pick-up coil, the injectors may fire at the wrong time causing the engine to lock up or backfire. It’s obvious that an aftermarket fuel injection kit is the better choice when performing a swap like this. The aftermarket units are ready to run and are guaranteed to work with your engine. The same cannot be said for a junkyard system.