Question about 1992 Buick LeSabre

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Hesitation on Acceleration or Uphill.

1992 Buick LaSabre. Automatic. 136K mi. Accelerating, driving over 60, or going up a mild incline gives an intermittent hesitation. Puh, puh, puh, and loss of power. Mid grade fuel helps a little. High grade fuel offers no additional help. Driving next to a wall, I do hear pinging. Gidagidagidagida. But it seems to be able to ping without necessarily the hesitation. Driving up an incline, I get both. GidagidagidaPuh.. GidagidagidaPuh.. GidagidagidaPuh.. GidagidagidaPuh..

I thought about changing the knock sensor. But it is expensive. No check engine light. Is there a way to test the sensor? Is it possible for the sensor to be bad without a check engine light? Has anybody fixed this same problem?

Peter

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  • Peter Stearns
    Peter Stearns Aug 19, 2008

    Yes, I changed the fuel filter. Perhaps a small improvement. I haven't checked the fuel pressure. Would it be a good idea to invest in a fuel pressure gage? I assume the spark timing is taken care of by the computer. Is there any way it can get off? The timing belt hasn't been changed yet. I looked at one spark plug. Gap was correct. It wasn't burnt.

    Is the knock sensor supposed to gradually ****** the timing? I could understand the hesitation if it were instead detecting ping and then suddenly changing the timing too much.


  • Peter Stearns
    Peter Stearns Aug 20, 2008

    Shouldn't very lean mixture set the check engine light?

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The knock is caused by either timing issue or a lean cylinder condition, have you checked the fuel pressure?? has the fuel filter been changed?? A bad knock sensor will not set a light unless it is open or disconnected.

Posted on Aug 19, 2008

  • yadayada
    yadayada Aug 19, 2008

    The knock sensor, well here is how it works, it senses certain harmonic vibration in the engine, those that are created by pinging in the engine, then it pulls the timing back for just a split second and waits for the knock to go away, this all happens very fast, milliseconds. I would buy the type of guage you can hook up to the shradder valve on the fuel rail to the fuel injectors. One last note, the knock sensor can only do so much, when everything is running ok you will hear no ping, but engine concerns such as very lean mixtures can over-power the ability to get the timing retarded enough to stop the ping/knock.

  • yadayada
    yadayada Aug 20, 2008

    A lean cylinder condition will no always set the MIL, in fact sometimes it will give a rich code, to much air and raw fuel goes out the tailpipe. Have you tested the MAF or MAP sensor, they have a huge influence over timing.

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Sounds like what happend to my 92 it was the crank sensor

Posted on Sep 02, 2008

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  • 2 Answers

I had this problem. We changed the sparkplugs and fuel filter, and have not had an issue since.

Posted on Sep 07, 2008

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