The ECM in those years had removable Proms and did not need flashing as new ones do . Some relearning is performed as the vehicle is driven . What quirks are you having ?
SOURCE: Where is the ECM located on an 1989 Buick Century Custom V6 3.3 l
unhook the battery for about 15 minutes... that will reset it ... if the stereo is an anti theft type... make sure you know the code and how to enter it.
SOURCE: 1989 lesabre engine codes
26 is a quad driver failure, 41 is a cam sensor failure. I can give you a test procedure for 26 but for 41 you likely need to replace the magnet that is in the cam gear for the cam sensor pick-up.
SOURCE: reset button on an 04 buick lesabre
You can disconnect the battery cables for a couple minutes which typically resets the ECM to some predetermined (default) settings which may make your vehicle run or respond slightly different than it currently does but as you drive the vehicle it will relearn and adjust as needed. If you prefer to wait awhile then it will turn off itself after several --several cycles of the ignition ;so long as the problem is fixed or no longer exists and there are no other problems.
SOURCE: I need to locate my fuel filter on my 1989 Buick LeSabre
Its under the car.Drive the car on ramps or do whatever to get under the car safely. Buy the new filter so you can see what it looks like. Use safety glasses,a small drain pan and rap some rags over the connection before you take it loose. It is under some pressure, but the pressure will bleed off soon.I hope this helps you.
SOURCE: how to remove 2000 transmission buick lesabre
If you are asking..... you cant/should not do it. Its heavy, awkward, and not possible with out proper tools and equipment.
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