Start easy when is cold but hard start when it warms up

SOURCE: Audi 80e 1991 hard starting when cold

I've owned the same car. Check that the fuel relay 'primes' the system before you start the car. When you turn the key to the on position (all you dash lights, ready to start) you should hear the fuel pump run for a second or two. If it doesn't run you can replace the relay for about $30. If the relay is not the problem, it may be a check valve within the fuel line to the engine. This valve keeps fuel from draining back to the tank when the car is sitting. That way, there is fuel close to the motor when it's time to start. The temp senor was not a bad shot, they were thinking it was bad sensor not telling the cold start injector to run. Obviously not the case. However, the injector itself may be faulty in some way. As long as the car always starts, it's one of these problems, assuming the ignition system and engine mechanicals are in running order.  good luck. JK

SOURCE: F250 Ford 7.3 L Powerstroke Hard to Start Cold

definately replace the glow plugs i'm 95% sure this will fix your problem had one of these in the shop the other day for a detail and at the same time fixed his hard starting issues.

SOURCE: 454 ci gm turns over hard backfires timing ok acts flooded

Check fuel pressure, and regulator. A leaking regulator gives a warm engine more fuel [ it does not like it] a cold motor does. same as a flooded motor. Good luck

SOURCE: HARD TO START ENGINE WHEN IS VERY COLD

check your battery, and see if the cca's (cold crankink amps) are up to par. How to test is, when it is cold try starting, if it starts slow shut off immediatly and put a "jump" on it. If it starts quickly...replace battery.