Question about 1991 Buick LeSabre

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1991 Buick Lesabre Shuts off when Reaching operating temp

Starting it up in the morning... Fine... Runs for a bit and bucks like a dangum bronco! Up until recently, I 've been a tech. I was a tech for 8 years. I'ts dumping WAY too much fuel. This I know for certain. Ignition system is fine (i.e. plugs and wires etc). Oil and filter new. Air filter new. Fuel filter new. I do not have a tech 1 to scan it with. The check engine light is on. I have replaced the ECT already. As a tech I got really used to being able to reach for my computer and solve these kind of problems on my own. Where do I jump wires to determine the trouble code(s). Anyone have any ideas on what this could be. I'm really leaning towards the MAF, but ****.... It's expensive.

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  • Jeremy West
    Jeremy West Jan 15, 2009

    Thanks for the help. ended up being the crankshaft position sensor.

  • myjcorp Mar 10, 2009

    1991 Buic LeSabre shuts down after reaching operating temperature... How can I fix this problem myself.. and is it going to be very costly to repair???

  • Jdmay Mar 17, 2009

    exact same problem....chugging engine dumping too much fuel....if it is left for a couple of days it eases not fixes the symptoms, but conitinueing to run it causes it to even loose power....James

  • mark_ma Mar 22, 2009

    1991 Buick Lesabre shuts off when reaching operating temp,usually 20-30 minutes after driving.It can start right away but the engine shuts off soon. I checked the temperature sensor under 25-100 degree celsius, resistor of the sensor is normal. What could be the problem? Please help.





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It sounds like the throttle posistion sensor or the ECT sensor which is the engine coolant temperature sensor. They both take care of that very problem

Posted on Jan 04, 2009

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Sounds a lot like the MAF sensor to me, has the right symptoms. When it is running right, take a screw driver and gently tap the cover of the MAF sensor and see if it starts running bad.

Posted on Jan 04, 2009

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