Octane reading
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Northstar Engines and System Technical Discussion Discussion, Octane reading in Cadillac Engine Technical Discussion; On my 95 STS while in "pcm data mode" there is one of the data reading's that tells you the ...
  1. #1
    first sts is offline Cadillac Owners Member
    Join Date
    Nov 2003
    Location
    Florida
    Posts
    35

    Question Octane reading

    On my 95 STS while in "pcm data mode" there is one of the data reading's that tells you the Octane reading,,,,PD42,,, mine is reading "0"....WHY ????

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  3. #2
    epanightmare is offline Cadillac Owners Member
    Join Date
    Oct 2003
    Location
    Richmond Va.
    Age
    34
    Posts
    38

    Re: Octane reading

    Quote Originally Posted by first sts
    On my 95 STS while in "pcm data mode" there is one of the data reading's that tells you the Octane reading,,,,PD42,,, mine is reading "0"....WHY ????
    PD42 Octane Level of Fuel
    Display shows the octane level of the fuel based on recent knock sesor activity. This parameter will only display 0, 87, 90, or 93 indicating the fuel octane calculated by the PCM. A parameter value of 0 indicates the PCM has not had enough time to calculate the octane level. Display will always read 0 for vehicles with LD8 (270 h.p.) engine.

    by the way what were you looking for. was there a problem or were you just playing with your car i know it's a neat feature..

    also if there are any codes or snap shot data don't just erase it because it can be very helpful for diagnosing problems, especially intermitant problems

    hope this helps EPAnightmare ...

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