Question about 1995 Buick LeSabre

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1995 Buick Lesabre runs really rough like all of the cylinders are not firing...Just replaced the wires with no change in performance...any ideas before i take it to the shop?

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  • zerngl Sep 20, 2008

    I have the same problem. Took my Buick into the repair shop and they did a pressure test on the cooling system. Coolant is getting into the #5 cylinder. It is either the head gasket or the head. It had the 3.8 litre and I am not sure if am going to try to repair it. I was also told by someone that this engine is notorious for intake manifold leaks. I have heard that you can test this by running the engine an running an open propane torch (unlit) along the seal of the intake manifold and the head. If the engine revs, it has a leak.

    Good Luck. My Buick has over 200,000 miles on it.

  • Anonymous Sep 30, 2008

    My 93 Buick Regal 3.8 has 170,000 and runs rough at idle but great at high speeds. at school no teachers noes what wrong with it. did a vacuum test and was reading low vacuum. i was thinking of the head gasket leaking, but never did a presser test.

  • Anonymous Oct 10, 2008


  • jdextreme85 Feb 03, 2009

    i have a 95 buick lesabre. it runs great but the coolant keeps disappearing. i replaced a bad water pump which stopped the leaking of the coolant but now its like its just mysteriously evaporating. ive been told its the head gasket, and they want 1700 to fix. this seems like an unreasonable amount of money to replace a head gasket and ive been thinking of doing the work myself.. ne suggestions about how to go about doing it?

  • shadowrider4 Feb 08, 2009

    car runs baddd under load up hills and such also at times will crank but no start, wait a while and it starts.


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Check the psi in the regulator at the fuel rail/ possible bad reg.

Posted on Feb 08, 2009

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Your engine has a set of three coils, round with two spark-plug wires per coil. at about two to three o'clock as you look into the engine bay from the front of the car. replacing one of these at a time may give you the faulty coil without over-buying parts. get one and replace #1, if no change replace #2 and again if no difference replace #3. this just may put the spark back into your relationship with this car.

Posted on Nov 01, 2008

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99 Buick Lesabre Check engine light flashing.I changed wires and plugs but still misfiring on one cylinder, but all plugs are firing. Have 84,000 miles and has been running great until light came on and...

From the symptoms of the problem and the precautions you have done i think its time to check the EGR valve.Clean your EGR valve and then put it again. How handy you are in ding this?

As the check engine light is on did you scan for error code which will help you more specific to locate the problem.

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Insofar as your Ignition Wiring Diagram, I hope you're speaking of what's also called the Spark Plug Cables or Firing Order. The proper Firing order for your V-6 is 1-5-3-6-2-4 with the number 1 cylinder being the front spark plug on the left hand side. The left hand side is Odd numbered and the Right hand side is Even numbered, therefore number 2 cylinder is the 1st plug on the right hand side of the engine.

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I have a 2000 buick lasabre that has been running very rough, my son put computer on and it said bad o2 sensor, he replaced sensor, and it is still running rough, but the computer now says cylinder 6...

plugs and or wires.
for some reason the spark is jumping out of the wire or plug.
the plug insulater may have a crack in it.
also use a carb spray to clean out the throttle body at the throttle plate.
all the black carbon will build up around the throttle plate and restrick airflow at an idle position.

hope this helps
thank you

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First I would change where I buy gas.And perform a tun up,start with the spark plugs,if it runs okay your done if not #2 change your wires.And clean your throttle body with carb cleaner.

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