TS1 (ambient air temp sensor) has a minor enriching effect, but TS2 (CHT) has a major effect and with an open circuit will not allow car to start or run. In my experience, with a bad TS2 or TS2 circuit, a stone cold car may catch briefly but then won't even give you that. An open TS1 circuit should not prevent the car from running in and of itself. Are you flooding? Have you inspected the plugs?
The TS1 on a 2.0 is located directly on top of plenum (under air cleaner), in the vicinity of the throttle body and throttle body sensor. It's sticking straight up and down with a two wire connection.
TS2 is in between cylinders 3 and 4 underneath the engine tin. If you look underneath the intake runners between the cylinders on the passenger side you should see a one wire lead going to a hole (it may still have the grommet covering it). That leads to the CHT.
To troubleshoot the CHT you need to thoroughly inspect the lead from the sensor all the way back through the wiring harness to the ECU. Is the CHT actually connected to the wiring harness? Are there signs of breaks or kinks in the wiring that would leave an open or intermittent circuit? Once you do that, you need an ohmmeter to test resistance from the CHT lead to ground (negative battery terminal). I believe you also have a ballast resistor on this circuit for a '73. If you need to replace the CHT because the values are not correct, it's a little bit of a PITA, but there are threads here describing the process.
The CHT isn't the only possible suspect if you think the car is essentially flooding. The MPS could also be failing.
More with LOTS of good information. Please read:
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