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Thread: problem with map sensors

  1. #1
    alanhoggard is offline Cadillac Owners Member
    Automobile(s): 1994 eldorado
    Join Date
    Dec 2008
    Posts
    12

    problem with map sensors

    Hello, I am going through map sensors about every 4 months on my 1994 eldo.
    I just put one in yesterday and noticed everything in the intake/valley pan area is covered in oil, the map sensor was also covered in oil. Is this oil causing the map sensor failure and if it is, what could be causing the oil in the valley area?
    Thanks


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  3. #2
    Ranger's Avatar
    Ranger is offline Cadillac Owners Member
    Automobile(s): White Diamond '03 DHS (with DTS floor shift)
    Join Date
    Jun 2004
    Location
    Woodstock Ill.
    Age
    69
    Posts
    82,278

    Re: problem with map sensors

    Not sure if that is causing the MAP failure, but that would be my guess. The oily residue is normal. It is a combination of crankcase gases from the PCV valve and exhaust gases from the EGR valve.

  4. #3
    alanhoggard is offline Cadillac Owners Member
    Automobile(s): 1994 eldorado
    Join Date
    Dec 2008
    Posts
    12

    Re: problem with map sensors

    OK Thanks! I was looking at the map sensor I took out, inside the tube there is a shiny area, it looks like about 1/4 of the shiny area is covered with dirt. could that be causing and intermittent MAP sensor problem?

  5. #4
    Ranger's Avatar
    Ranger is offline Cadillac Owners Member
    Automobile(s): White Diamond '03 DHS (with DTS floor shift)
    Join Date
    Jun 2004
    Location
    Woodstock Ill.
    Age
    69
    Posts
    82,278

    Re: problem with map sensors

    Not sure, but certainly possible. Can't hurt to clean it.


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