Question about 1997 Buick LeSabre

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97 buick lesabre 3.8 Idles rough and stalls out.

97 buick lesabre 3.8 Idles rough and stalls out. Gets better when warmed up. Stills idles rough when warm but doesn't stall. Going down road will not take gas and then all of a sudden will go. Fuel pressure is good and have changed ECT and Fuel Pressure Regulator. Mass Air flow is 10 gr/sec at idle and IAC seems to be working. Cleaned throttle body. Cat is not stopped up.

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  • brandoak2000 May 10, 2010

    Someone else worked on before I got it. Intake has been replaced. Got a used tps already but no change.
    Owner did say that had chaged plugs and got better for a few days but problem returned. No light except when swithing tps sensor. Got a p0121. On freeze frame long term and short term trim were real high.

  • brandoak2000 May 10, 2010

    Tried starting fluid already and got nothing.

  • Anonymous Mar 16, 2014

    Changed fuel pressure regulator, oxygen sensor, put new spark plugs in it. acts like its flooding out and overwhelming smell of gas from exhaust

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Fuel injectors go bad on these engines, you can find re manned ones for 30 bucks. If you have an engine light on get that read. Change your coil/wires/plugs also. Is the lower intake manifold gasket leaking coolant yet? You may want to get that replaced also. Check the TPS too (throttle positioning sensor) those will also cause your engine to act up

Posted on May 08, 2010

  • Alex May 10, 2010

    Well, have you changed wires/coils yet or the ignition plate under the coils. I would try it, i'm still thinking if not this it may be an injector

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It's a Spark Problem ! Check CoilPack for any Corroded or rust on Wire on the Plug that connect on the CoilPack Module, Check or replace the 6th Spark Plug, Check if there's any Cracked Coil, remove coil and check if there's no corrosion on the Coilpack module Aluminium Plate ! If anything else contact-me a_savage43@hotmail.com ! I Do Know very well 3.8 !

Posted on Jul 21, 2010

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Ignition system not operating properly ,or intake air leak ...crank engine get a can of staring fluid spray around the intake if the motor idles up you got a leak hope this helps

Posted on May 08, 2010

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Missing terribly but runs. When put in gear it shuts off. What's wrong?


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91 buick lesabre chugging at idle and accelerating smooths out at speed


It can be issue with IAC( idle air control valve) causing the problem.


There are many other possibilities causing these idle issues. Engine idles rough.

There are few help links with solutions to troubleshoot such idle issues.

I suggest you refer the link below and follow its troubleshooting details:------

Click the link below:-----

Ford Expedition IAC valve replacing

http://technoanswers.blogspot.com/2012/12/ford-expedition-iac-valve-replacing.html

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http://repairhelpcenter.blogspot.com/2012/01/engine-stumbles-coming-off-idle-when.html

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1 Answer

Buick 97 lesabre, runs rough when warm


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Jan 25, 2012 | 1997 Buick LeSabre

1 Answer

Hello i have a 1995 buick park avenue that has a rough idle and stalls in the mornings after sitting over night the first two or three times it will stall but after that it idles rough til it gets warm,ok...


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My 1991 buick lesabre will start but idles rough, and stalls if you give it gas


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