Weird starting conditions

[alternative]

I've been through what must be at least 5 posts now with the issues on this car, I'm wondering if anyone knows of a way to test the ECU in the car for any faults. Can I crack it open and try to find a faulty part? Is there a spec resistance across certain pins? The reason I think it's the ECU is because the car will only start with the coolant temp sensor unplugged, once it starts with the sensor unplugged it runs extremely rich. I'm also thinking the lambda sensor is faulty and since I don't know when it was last replaced I want to replace it, anyone know where I can find one? Amazon said the Bosch 11027 Oxygen Sensor would work, I'm not sure how much I trust that though.

[TX82FIAT]

Bosh 11027 will work for the O2 sensor. Many cars of the period use this sensor and you can get the part for $20 and not pay what some folks on e-bay are asking. Do you have any fellow fiat enthusiast near you with EFI that would be willing to help. I've found with the ECU and air flow sensor if you suspect it, it helps to plug in a know functioning unit to see if that solved the problem. Had a spare ECU and wish I had not given it away but it was put to good use.

[bahassler]

Did you perform this check?

https://1drv.ms/u/s!Ai7cG8QKcw62g9tGqGZ ... w?e=C98jkz

And this one?

https://1drv.ms/u/s!Ai7cG8QKcw62g9tHopr ... A?e=UX0hhc

[spider2081]

the car will only start with the coolant temp sensor unplugged,

Unplugging the coolant temperature sensor causes the ECU to command a full rich mixture. If that is the only way the car starts my first guess without making any troubleshoots tests would be that the cold start valve is not opening. The cold start valve gives a short blast of fuel into the intake plenum for start up when the ambient temperature is below about 95 degrees F. To me that means most of the time.
have you plugged the coolant temperature sensor in once the car starts to see it if continues to run??

I believe disconnecting the oxygen sensor also tell ECU to enricthen the mixture