When you start the car it idels for about 8 minutes then the engine starts missing badly.evenuatly the engine stalls. when the engine cools it starts runs gets wwarm and stalls again.
The automatic idle control valve may have stopped working or the control module that operates it.
SOURCE: 2002 buick regal vibration
Could be several things, check the following: engine mounts, transmission mounts, transmission universal joints. If its not these then you may have a bad misfire?
SOURCE: fans run constantly
Irwinr12 is right, no amount of fan will keep the Regal from warming up if the thermostat is working properly, Replace it. Clear SES light with OBDII tool & you should be good to go. BTY its the car computer that keeps the fans running, and they will continue to run until you clear the code. Any kind of cooling/overheating proiblem will kick in the SES light and set both fans running. I own '01 GS, my son has '03 GS and we have both complete set of service manuals. Trust me, do what I say. Batman
SOURCE: 1991 buick regal starting and running problem
Sounds like your car is overheating. If you have a temp gauge it should show that. If you just have an idiot light, by the time it comes on it's already too hot to operate. AFTER the car is cooled down, open the radiator cap to see how much coolant has been lost. Chances are there is alot missing. Add WATER (no sense in adding coolant if it's going to leak out) and idle the car at home. Look underneath as it warms up to find where the leak is.
SOURCE: 1994 Buick Regal Gran Sport shuts off once engine warms up.
it might be a bad ignition moduale. or could be a bad ignition coil
SOURCE: I have a 1991 buick regal stalls and shut off after warming up
egr valve is not opening up when the engine reaches it normal operating temperture
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