Question about 1991 Buick LeSabre

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1991 Buick LeSabre 3.8L misfire

Engine randomly cuts out, or misfires and has severe vibration when it does. does not matter what speed or gear its in. Have already gone through the fuel system. The check engine light never comes on.

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Plug wires! If it miss fires under a load it's usually an ignition problem. Check the plugs and replace if necessary and replace the plug wires.

Posted on Feb 06, 2010

Testimonial: "Already changed plugs and wires."

  • pjbarnes11 Feb 07, 2010

    The only other thing that I can think of is, crank or cam sensor, either one of those could throw the timing off. But, you would think either one of those would give you a "check engine" light. It's possible the torque converter is doing something goofy. I don't know if the computer in a 91 will pick up the fact that the torque converter is not locking up. Sorry I can't be more help.



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1 Answer

2002 Buick lesabre check engine light flashing and runs rough help

You have a misfire ,spark plug ,coil etc. .. the flashing check engine light is to warn you that the misfire is severe enough to damage the catalytic converter ! You need to take it to a repair right away ! A new catalytic converter can cost as much as $1,000 . The shop will check the code's in the PCM . this will tell them what cylinder is misfiring !

Apr 22, 2015 | 2002 Buick LeSabre

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Vibration when accelerating

you could have a misfire occurring at this speed only, also you could have a cv joint that is bad that is showing up under acceleration in speed area. another possibility could be wheel balance or a balance weight has come off of a drum or rotor.

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Replaced upper intake gasket, still losing antifreeze this time not visible

Did you change the Plenium also / if not you should of, these also go bad and leak antifreeze through to egr port , most parts stores will recommend you change it too, i've done several and they look good but the plastic turns soft and leaks coolant to egr port.

Mar 19, 2013 | 1999 Buick LeSabre

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Car has slow acceleration at low speeds and sputters, in addition the check engine light is on but only gives the code 0300. Suspect the o2 sensor but with only the code 0300 does not specify anything...

I would check spark plugs and wires. I have had similar problems from a mis-gapped or lose spark plug or wire. most misses are more noticeable at low speeds

Jul 01, 2011 | 1999 Buick LeSabre

1 Answer

Random misfire on 99 Buick LaSabre

random misfire can be due to bad sparkplug wires or a vacuum leak at the intake, there are many thing that can cause a random misfire even low fuel pressure, and last would be dirty injectors. i would start by having the fuel pressure checked and then having the injectors cleaned.

May 28, 2011 | 2000 Buick LeSabre

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2002 Buick LeSabre shows 3 trouble codes: p0404, p0410, AND P0300 .. Car lacks power... will operate pretty well between 1800 and 2400 RPM. Beyond 2400 RPM there is nothing, no response when accelerator...

P0300 is random engine misfiring. Could be several problems. My car had this and I replaced the plugs and plug wires. No change. Checked the three coil units. They seemed ok. I used a new on in each spot and nothing changed. Ended up being the ignition control module that sits under the coils. Relatively easy to change. Costs around $150 at the parts store. This may correct the other codes.

May 03, 2010 | 2002 Buick LeSabre

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98 buick lesabre 3.8, engine misfires. coil for #1& #4


Nov 10, 2009 | 1998 Buick LeSabre

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I have a 98 buick LeSabre showing a random missfire code

Disconnect the battery for about a half hour or so. This could clear the code and turn off the light.If it has a problem the light will return. If it does replace the spark plugs one at a time being sure the gap is perfect.

Nov 06, 2009 | 1998 Buick LeSabre

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1997 Buick LeSabre: Can't tell if my transmission is slipping or

If you have a steady misfire on your vehicle, 96 and newer vehicles have a misfire detection where it will actually flash the Check Engine Light telling you that you are doing lots of damage to the Catalytic Converter. If Engine light isn't flashing providing it comes on and does actually work when you first put your ignition into on position, then you probably don't have a miss. Spark tester in-line on each spark plug wire if you are still unsure.

Apr 09, 2009 | 1997 Buick LeSabre

1 Answer

99 buick Lesabre

hey thanks for bringing me up to speed. ive been working on many other problems but with your great explanation i remember.
we need to check the compression on that cyl. and compare it to the compression on 2 other cylinders your choice.
but before you do this get a can of carb cleaner . and with the car idling spray around the intake manifold in the area of #6 cyl. what we are looking for is a small vacuum leak that would also act like this. with the engine idling and spraying around the intake the engines idle sould not change and if it does when you spray you have an intake leaking.
let me know how it turns out.

Sep 22, 2008 | 1999 Buick LeSabre

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