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Buick LeSabre: Problem Codes/TSBs/Recalls



  • my 1991 buick lesabre has a knock i only hear while idling or at slow speeds 10-15 mph. the oil light also blinks on and off at times. could this be oil pump? or could it be major(bearings)?
  • imidazol97imidazol97 Crossroads of America: I70 & I75Posts: 18,048
    If the oil hasn't been changed for a while, check to see if it seems diluted (thin) and smells of gasoline.

    I'd change the oil and put in 20-50 IF you're not in a cold, cold climate. I'm assuming you're using 10-30 now.

    You don't tell how many miles and what kind of maintenance like regular oil changes at 3000-4500 miles it's had. I'm assuming it's wear on bearings especially if it's over 150K. miles and hasn't had frequent oil changes.

    I'm not sure about the knock meaning since it's at low rpms only.

    Ask in this discussion about noise and which oil might buy some more time on the motor.
    Oil, a slippery subject
  • it has 79000 miles and the older gentleman said he serviced it regularly at the dealership. do you know anything about a product called no knock or something like that. if you do will it harm the engine. also everybody is saying they are getting 25-30 mpg. on ther'e 91 buick just like mine 3.8

    i put spark plugs in it. what can i do to tune it up to get optimum gas mileage.
  • imidazol97imidazol97 Crossroads of America: I70 & I75Posts: 18,048
    At 79000 and regular service I'd want to find out what it was. The sensor for oil pressure could be bad. The oil changes he did might have been 7500 miles instead of 3500. The knock could be something other than lower engine problems. Could be a crankshaft balancer. Is it erratic or constant with ignition firing?

    If you know which dealer did the service, I'd go back and ask them about the records for the vehicle. And I think it would be well worth having them check what's the problem.

    Listen with a broomstick or long piece of wood to where it comes from in the motor. Be careful of belts and moving parts. Change the oil and put in fresh oil.
    Take off the serpentine belt and spin and push and pull on each of the pulleys to look for one of those giving trouble. Check the idler pulley really carefully. They usually give a squeal or rushing noise on newer 3800s but you could have a pulley on an accessory bad.
  • what do i need to do to get optimum gas mileage on this car. i put new plugs in and it gave me a couple more mpgs.. what else do i need to do. i was posting this question while editing my reply to imidazol and he answered my question before i finished editing it which was great. he's fast. by the way thanks imidazol
  • imidazol97imidazol97 Crossroads of America: I70 & I75Posts: 18,048
    If the plug wires are still Packard which is original Gm wires, it's past due. If they're a different brand I'd go by how old they look.

    I'd put in a bottle of Chevron Techron fuel system cleaner (available at Walmart, Meijer, Pepboys, Advance auto, compare prices). Put it in when tank is low and then add 10 gallons or 20 gallons. Drive and see if it makes a difference. I use it twice a year. Don't over use it. And don't get the injector cleaner version in the same black bottle. I don't think it's as strong.

    Check the air filter. Replace if it looks like dirt is embedded into the fibers. Or knock dirt off and continue.

    See if the trans oil has been drained and replaced. If the one dealer did service, they can tell you if it was done if the papers aren't in the car. Some people would advise against draining oil after 15 years. You might want to ask in the Oil, A Slippery Subject forum.
  • imidazol97imidazol97 Crossroads of America: I70 & I75Posts: 18,048
    A note about oil light. Could be sender. Could be worn oil pump and that may have lowered pressure and worn bearings.

    and someone noted in another discussion

    " These engines were notorious for their weakened oil pressure relief valves. If you have been using conventional oils and not changed oil at proper intervals, you probably have gunked up the seals inside the relief valve or in the oil pressure sensor. Doing a motor flush may help things out and restore the operation of the relief valve. You might try adding Risolone (a high detergent oil) to your crankcase and hope for the best. Other than that, it's a fairly meaty chore to remove the oil pan and oil pump for replacement."
  • thanks a lot for your time and help.
  • i have a 1994 lesabre. the climate control works rarely with the individual climate buttons illuminated but it usually doesnt. there is no light illuminated 98% of the time and the air comes out of all the vents. the temperature control always works as well as the blower motor. there is a clicking behind the dash below the passsenger airdag and above the glove box when the control lights flicker. does anyone have any idea what needs to be replaced?
  • regarding ur window motors, the motor teeth could be worn down. if u can take the door panel off, you should be able to find the window motor about midway down the door. if the teeth on the outside arent worn, turn the key to the on position and tap on the motor with a small hammer while pushing the power window switch up and down. if nothing happens, its most likely the window motor. have you tried to push the window down? the window could simply be stuck as well. u will be able to tell if the motors internal gears are spinning or not. if not, u can most likely spray some multipurpose lubricant on all the moving parts. u cant go wrong by spraying too much.
    im not 2 sure about the lights in the steering wheel. u may b able 2 get the switches replaced. unfortunately u sometimes have to do that. good luck!!!
  • I also am checking on a 94 Buick Lesabre and check engine light is on. Engine light comes on after about 10 minutes running, surging up and down,and is running rough at idle. Could you please send me the diagram on how to jump. I got a key from Autozone, but can't figure out where to use it. I have wire down for code reader. I don't see any A and B on it. Please help.
  • imidazol97imidazol97 Crossroads of America: I70 & I75Posts: 18,048
    I looked it up and 93 was the last year for jumping A and B on the Assembly Line Diagnostic Connector. In 1994 you need a special set of connectors that are different than the OBDII connectors that are in use after that transition period.

    You need to find a store or some who has them.
  • kelli3217kelli3217 Posts: 1
    I am having a similar problem with my climate control buttons. Did you ever find out what the problem was and how to fix it?
  • rlrufusrlrufus Posts: 4
    On mine it was a switch in the dash. Replaced the switch and both sides worked as they should.
  • The security light on my 94 LeSabre is flashing! now what? I didn't even take my key out of the ignition when I try to start it, it does nothing. I know it is the security system but what can I do? This is driving me crazy. Thank you.
  • imidazol97imidazol97 Crossroads of America: I70 & I75Posts: 18,048
    When you put the key into the ignition and then turn the key to ON, the security light should come on for a few seconds while the VATS reads the resistance of the chip. If it doesn't read the right resistance for the chip, it then flashes for 3 minutes and then resets itself to read the next key inserted.

    Do you have a second key? Put it in slowly and then turn the key to ON before turning the key to START. See what the Security light does.

    The resistance it reads may be wrong because
    the contacts inside the entrance to the key cylinder that contact the two sides of the key resistor are worn or dirty. You can try putting alcohol on the resistor parts of the key and quickly insert it to clean the with the alcohol carried in.

    The resistor on the key may be gooey or oiley. Rub it with a pencil eraser to remove goop on the two resistor contacts.

    The two wires that go from the contacts inside the key cylinder down the steering column to the connector at the base may have broken some of the fine wires where they bend all the time as the tilt wheel goes up and down.

    If it reads the key resistance as correct, it will then start the car. It may still have problems. The light may come on while you're driving if and then go off again.

    The dealer will want to replace the lock cylinder and cut new keys for that cylinder at $30 each. I would expect $300 at some dealers. Independent garages may charge less that are knowledgeable.

    There is a fix where resistors equal to the key resistance are soldered into the circuit down on the steering column instead of the contacts reading the key in the cylinder at the top. Then you have no theft deterrent but the VATS system always works. (VATS=vehicle anti theft system).
  • With only 42000 miles on my mothers Lesabre she needs to replace all four struts. Bought new, the little old lady type driver, driving on main roads - what do you think would be the reason for the strut replacement ? I have driven the car and checked it out and they do need to be replaced. The car has not been hurt and well maintained. Have there been past problems or recalls? Thank you for your input time.
  • imidazol97imidazol97 Crossroads of America: I70 & I75Posts: 18,048
    To what are you comparing the struts?

    The Buicks had a very soft, but controlled ride. They are at home on a relatively smooth street and interstate. If it's a Custom, that's even more true because it doesn't have the leveling rear struts that pump up to maintain height. Those were actually stiffer than the base struts for the rear. In the 1993, with two people in the rear, stopping at a stop sign quickly and making the nose dive then hitting the gas actually threw enough mass to the rear that the struts bottom (softly).

    If you're comparing to an Accord's ride, that won't work as you see from what I've said. If you mother intends to keep the car I'd do as I did on both my leSabres and put on Monroe SensaTrac stuts all around. You can shop for price. I don't recommend Sears but another store would match their pricing. Sears runs half price on installation labor cost fairly often and you can take that plus the cost of the struts to shop at your favorite place. Don't forget there'll be a 4-wheel alignment added to that.

    Eleven years of age may also have softened the struts.
  • Thanks very much for the input. I guess I am use to driving my Honda Pilot having a stiffer ride. I will pass on your recomondation and she will probably go with that. Thanks again for your time and input.
  • I have a 93' Lesabre and the other day I pulled the codes from the computer and I am trying to clear them. I was wondering where exactly the ECM fuse is located under the hood? Thanks
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