Hey, new here.
1990 f150 5.8L (E4OD)

After diagnosing and confirmed it’s cooked, I’ve been looking for a new ECM for my 1990 f-150.
number on the Ecm is F0TF-12A650-R2A
and the the calibration number (whatever that is for) is 0-64H-R00.

the only ECMs I can find are listed as F0TF-12A650-RA
as far as I can tell, that one is for the same truck, engine and transmission.

Will that work? Or cause issues?
what’s the difference with the missing ‘2’?

Thanks.

 

I don't know what your original problem was but the ECM's were very reliable and don't cook. The ECM's are getting more difficult to find.When they do fail due to age, it is usually buldged out or leaky electrolytic capacitors. There are three of them and I would remove the cover for a look. They are cheap and generally the problem with the ECM is resolved with the replacement of them.

 

How was it determined the ECA was defective ?
What was the original problem?
OBD I computers did provide a dynamic test procedure where the Ford computer did a running test and would provide codes to tell if there was a malfunction within the system. Most folks were not aware of this feature. There was a special procedure to initiate the test which began with depressing the brake pedal once, and moving the steering wheel back and forth to check those parts (stop lts & pwr strg sensor) of the vehicle. .It saved me a lot of unnecessary checking.
Also, if a shorted solenoid for example blew the control within the computer and it was not found and corrected, it would wipe out the replacement computer too.

Replacement computers later on would come with instructions of what checks to perform BEFORE connecting the replacement computer>

They have come a long way with OBD II.