Question about 1997 Buick LeSabre

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1997 buick lasabre custom

Car is idles high i have changed throttle postion sensor and idle air control and still idle high i put a code reader on it reads P0122 = tps/ pedal position sensor A circuit low input also reads P1406 = egr valve car is still idling high
at one time the car run right but it would not shift in to gears and it stalled
do you think it could be the computer????

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  • corvette76 Jan 04, 2009

    we try that no leaks

  • corvette76 Jan 04, 2009

    if you think of any thing else let me know thanks

  • Anonymous Mar 21, 2014

    idles up and down,low vaccum reading,had a hot o2 sensor code

  • Anonymous Mar 31, 2014

    Does a TPS sensor on a 89 Buick Lesabre need to be adjusted? I just took the old one off and just put the new one on,I noticed that when I start the car ,it idles high before that it idled normal with the old one.Is the reason for the high idling due to not adjusting the new TPS sensor.PLEASE LET ME KNOW SOMETHING ASAP.



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  • 56 Answers

It sounds like you have a vacuum leak or intake gaskets leaking. Try this. Start the engine and let it reach the idle it want to go to. Get you a can of Brake Clean and spray it around the intake manifold (it on the top center of the engine, you may have to removed a plastic cover) If the engine idle changes up or down then the intake gaskets are leaking hence your vacuum leak. I hope this will help you.

Posted on Jan 04, 2009


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Posted on Jan 02, 2017

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SOURCE: 1997 buick lasabre custom high idle, transmission, stalling

had same problem i would check the Idel Air Valve and also check all of your vaccum hose lines makeing sure there are no cracks or splits in rubber connectors if there is repair immediatelt because over time they start to dammage the internal parts fo the engine and if youve replace tps mass air etc. sounds like a vaccum hose problem

Posted on Feb 10, 2009

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