Knocking at acceleration? Or Idle? Knocking could be a rod, piston slap, or tappets (rocker arms). If its a rata tat-tat its upper engine or tappets. A heavy thump is usually from the crank.
SOURCE: 2000 buick lesabre stall after starting or after running for 30 minutes
I have a 1996 Lesabre. I had a similar problem that slowly got worse. I brought it to two different mechanics that did diagnostic checks and could only "suggest" what to replace to fix the problem. Their problem was that it wouldnt stall out while they had the mv. After replacing a bunch of sensors and the fuel pump/ filter, I solved the problem by replacing the Crank Sensor. Its located behind the lower crank pulley on the 3.8 lt motor. Hope this helps!
SOURCE: change bulb right rear blinker 2000 buick lesabre
you have to open the trunk take the carpet off right next to the very back of car undo the 3-4 plastic wing nuts take light off of car change bulb ......reinstall reverse of taking off
SOURCE: 1990 Buick Lesabre keeps stalling
Check ecm for part number 1228253. If it has this number in it replace it with a 16198264. Gm had trouble with that ecm for a cutting off problem. Mine would stall driving down the road and when I would put it neutral it would start back up and not have any trouble for the rest of the day. You must set the tps with a volt meter or scan tool.
SOURCE: remove nut at top of rear struts on 97 buick lesabre
in the trunk pull back the liner!!!!!!!!!
SOURCE: 2000 LeSabre starts but runs very rough and stalls. After
My 2002 Lesabre (app 115000 miles) started something like this. Also the loose gas cap had been coming on for quite a while. I replaced the vacuum line from the air intake to the fuel sensor. It is under the engine cover (twist off the oil filler to remove the cover). There are two hoses together that come of the air intake. The small one goes to the top of the engine. The other goes across the front and makes a 180 turn back to the sensor. Chances are the 180 piece is cracked. It all comes from the dealer as one unit. $25
Seems to have fixed my problems. So if your car is running a little rough. Shutters under load. If the gas cap loose is coming on or probably a number of symptoms this might be the answer. I would replace this item. A cheap try.
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