Sounds like the ECU isn't getting the word that the engine is cold. Figure out which temp sensor is the one for the FI system (the other one is for the temp gauge), and check the condition of the wiring. When the engine is cold, according to Haynes the resistance across the sensor should be 2100-2900 ohms; 250-300 ohms when the engine is hot.

Terry
Being an 89 with LH fuel injection you should still have a cold start injector and circuit. I dont currently have my bentley handy so I going off what I remember and think would be best to check.

The cold start injector is in the plenum, after the throttle body.
Remove the cold start injector, placing it in a can of some kind that wont be eatten by gasoline, operate the starter and see if you have any fuel spray, I doubt you will.
Then I would remove the electrical connector, place a voltmeter between the connectors or a test light to see if you have voltage there. It not investigate the cold start circuit, I will check my bentley when I get home if someone else hasnt responded.

I have the exact opposite problem, my car (82 242Turbo) starts great cold, but when the engine is warm (after sitting for 2-4 hours) it has a hard time starting. I think the thermal time switch is bad. Our cars use 2 entirely different fuel injection systems, which is why I am unsure of your case exactly.

hope this helps a bit.
take care

Luke
82 242Ti 168k miles
84.5 245Ti 300k miles retired due to condition... :( now parts car :)

http://home.ncn.com/~pcguy