Which sensors tell the ECU to send a pulse to the single TBI injector?
You want a simple answer but there is not one. The ECU looks at many things to determine what (if any) pulse is proper. Any sensor which sends no information or info outside of normal limits can prevent pulse. No info from crank/cam sensor is common issue, Bad EFI fuse or relay can do this. Bad ECU ground or other ground (Fuel rail) can do this. Many sensors can be tested with ohm meter.
2000 geo metro hard to start after engine is hot
I would focus on what's making your car hot.... a bad catalytic converter sounds like what you have...It's before the muffler..It gets clogged up...makes car run a little hotter and harder to start....Google it
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