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Thread: '96 Eldorado, Severe Spark Knock Under Moderate/Hard Acceleration

  1. #1
    EldoradoKid's Avatar
    EldoradoKid is offline Cadillac Owners Member
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    '96 Eldorado, Severe Spark Knock Under Moderate/Hard Acceleration

    So, my Eldorado has 80091mi, has always been run on premium 91 octane with no Ethanol in it, the best synthetic oil, had a full tune up with factory platinum spark plugs and has been babied all its life. In the pass year, it started to spark knock more and more frequently and I am now starting to worry. It will do so from accelerations ranging from 1500rmp up, ( really bad above 2000rpm ). Now it doesn't spark knock every time I use it, which is not very often, but it still frequently does it and its very severe and loud spark knock .

    I am looking for any help I can get from someone who knows what could be causing this problem, I am really hoping its not an expensive fix.

    Thank you all in advance, EldoradoKid


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    MoistCabbage's Avatar
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    Quote Originally Posted by EldoradoKid
    has always been run on premium 91 octane with no Ethanol in it, the best synthetic oil
    All irrelevant.

    Have you pulled your codes?

    When's the last time the car's seen some WOT?

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    Submariner409's Avatar
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    Re: '96 Eldorado, Severe Spark Knock Under Moderate/Hard Acceleration

    "Babied" is one big problem right there, and do some searching in the Cadillac Tech Tips for threads on how to clean the EGR valve and passages.

    Study the entire Cadillac Technical Archive way up ^^^ in the black bar, especially the article titled "Occasional full throttle operation is good .........".

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    Re: '96 Eldorado, Severe Spark Knock Under Moderate/Hard Acceleration

    There are several possibilities. I am surprised you have no SES light on (Or so you?). Pull the DTC's. Post them AND their definitions.

  6. #5
    basscatt's Avatar
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    Re: '96 Eldorado, Severe Spark Knock Under Moderate/Hard Acceleration

    it still frequently does it and its very severe and loud spark knock .

    how have you determined what you hear is SPARK KNOCK?

    have you checked for codes?

  7. #6
    EldoradoKid's Avatar
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    Re: '96 Eldorado, Severe Spark Knock Under Moderate/Hard Acceleration

    So I pulled the codes, but there wasn't any that was even closely related to such a problem. I only had A/C and Traction Control codes, nothing else. And there is no SES light on.

    And I do give the car a WOT once in a while , like twice a year. Keep in mind the car is driven about 1000 miles per year only in the summer for the last 3 years.

    Could it be caused by a clogged up fuel filter? Dirty injectors? Or even by the timing being off? Is the car driven too little for its own good?

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    Submariner409's Avatar
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    Re: '96 Eldorado, Severe Spark Knock Under Moderate/Hard Acceleration

    Post #3. EGR

  9. #8
    Ranger's Avatar
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    Re: '96 Eldorado, Severe Spark Knock Under Moderate/Hard Acceleration

    Lack of EGR can cause a spark knock, BUT, that SHOULD set a DTC and trip the MIL.


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