My Town Car has died on me ONCE after restarting on a hot day. Ash and I made it to FLA and stopped at gas station after driving the thing nonstop some 300 miles. Filled up, topped the oil off and went to start the engine. Fired up, IAC began to close fast, idled real low and died. Usually it'll idle real low but then pops right back. No surge though.
Although, I don't know how you cleaned the TB with the engine running. To do a thorough job on any I've cleaned I've had to have the thing open all the way... You want to get all that schmoo behind & around the blade gone. You also want to take the stepper motor off the IAC and verify that the pintle(?) moves freely and doesn't hang up on anything or that there isn't any build up on it. Lube it a bit with ATF or chain lube and do the same for the stepper motor's shaft. I've had no problems with that method so far. Other than the weird issue with a worn out TB on a 300 straight six, where cleaning the TB caused the idle to be so high the IAC couldn't compensate for it and nor could the minimum idle screw. Not to mention that backing that screw out then caused the TPS idle value to be too low...
Although, I don't know how you cleaned the TB with the engine running. To do a thorough job on any I've cleaned I've had to have the thing open all the way... You want to get all that schmoo behind & around the blade gone. You also want to take the stepper motor off the IAC and verify that the pintle(?) moves freely and doesn't hang up on anything or that there isn't any build up on it. Lube it a bit with ATF or chain lube and do the same for the stepper motor's shaft. I've had no problems with that method so far. Other than the weird issue with a worn out TB on a 300 straight six, where cleaning the TB caused the idle to be so high the IAC couldn't compensate for it and nor could the minimum idle screw. Not to mention that backing that screw out then caused the TPS idle value to be too low...
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