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The idle should relearn by itself within a minute or so if there are no other problems. Was the battery changed/disconnected? Why do you think you need an idle relearn?
There is none.Idle is controlled by your computer. If you have problems, check these. Vacuum lines behind throttle body. You may have to replace your air flow sensor. You can also try this:
Engine cold.
Turn your key to on position for a full minute. Don't start the car.
Turn key off for 10 seconds
Turn key on for 10 seconds. (Don't start)
Turn key off for 10 seconds. Then start the car. Might work but in all probability your main airflow sensor (MAP) is the problem.
Did you ever find a solution to this? I am having the same issue on 2,4,6. I have replaced the coils. checked the intake for vacuum leaks. I am lost here let me know if you find anything and I will do the same.
My 2003 CTS would not start on the first, second or third try after filling the gas tank. Finally after several months of this occuring every two weeks a check engine light came on. It was the evac purge valve. Tom
Did you also check the air filter? The Cadillac CTS is very finicky about the differential pressure across the air filter. Checking the air filter often causes the hose between the air filter box and the intake to come loose or start to leak. This will cause the car to run rough or die immediately after starting.
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