Random light miss during constant hwy cruising
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Northstar Engines and System Technical Discussion Discussion, Random light miss during constant hwy cruising in Cadillac Engine Technical Discussion; I have a very random and intermittent miss noticed during consistent highway speed. The miss is very light, but noticeable. ...
  1. #1
    stngh8r's Avatar
    stngh8r is offline Cadillac Owners Fanatic
    Automobile(s): 1997 STS, 1991 Chevy RC w/500 CAD
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    Question Random light miss during constant hwy cruising

    I have a very random and intermittent miss noticed during consistent highway speed. The miss is very light, but noticeable. e.g. on an hour long trip, it may only occur 2-5 times.

    maintanence in the last year or so (which hasn't effected the symptom being discussed).

    -New plugs
    -New wires
    -Used lower mileage coil pack/module
    -New FPR
    -New fuel filter
    -Cleaned EGR
    -Random fuel treatment (~3x)
    -Sea foam in spark plug holes, let sit for few hours.
    -Cleaned TB as good as possible without removing it.
    -Cleaned MAF


    ? Possible culprits ?
    -Fuel pump
    -injector
    -vacuum leak (although it idles fine and shows no sign of this)


    Please help!

    Thanks for your time

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  3. #2
    Krashed989's Avatar
    Krashed989 is offline Cadillac Owners Connoisseur
    Automobile(s): 94 Eldorado, and a 99 ETC
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    Re: Random light miss during constant hwy cruising

    Any codes?

  4. #3
    stngh8r's Avatar
    stngh8r is offline Cadillac Owners Fanatic
    Automobile(s): 1997 STS, 1991 Chevy RC w/500 CAD
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    Exclamation Re: Random light miss during constant hwy cruising

    No codes.


    BUT........

    -Just a few hours after writing the O.P. I remembered! I had basically the exact same symptoms with my Vette.

    With the Vette, the injectors were maxed out anyways, so they were certainly due for a change whether it be because I had "out grown them" or they were flat worn out.

    Needless to say, I did not realize how worn out they were, because new injectors took care of my random misses in the Vette.

    My guess is, I have answered my own question. The culprit is worn out injectors.

    Thanks

    Eric

  5. #4
    Krashed989's Avatar
    Krashed989 is offline Cadillac Owners Connoisseur
    Automobile(s): 94 Eldorado, and a 99 ETC
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    Re: Random light miss during constant hwy cruising

    I hope you're right. Fuel injectors are pretty expensive.

    Did you replace the spark plug wires with OEM AC-Delco wires?.... Cadillacs seem to be really picky about that. A lot of generic brands will cause a small miss, or they simply wont last very long.

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