1987 Volvo 740 GLE -- Knock sensor problem.

Discussion in 'Volvo 740' started by jamiebabineaux, Feb 14, 2006.

  1. While replacing the breather box I broke the connection to the knock
    sensor. I soldered the pins back in place and the car idles and runs
    seemingly fine, but my mechanic noticed what he described as a lot of
    engine noise and a knock.

    Would a damaged knock sensor do this, and am I risking damage to my
    engine if this solder job isn't adequate? What exactly does a knock
    sensor do?

    Thanks!
     
    jamiebabineaux, Feb 14, 2006
    #1
  2. jamiebabineaux

    Boris Mohar Guest


    At the top of my web page there are links on some articles on engine knock.
    Your mechanics observation needs to be questioned. Did he drive the car at
    heavy load when he observed the "knock"?



    Regards,

    Boris Mohar

    Got Knock? - see:
    Viatrack Printed Circuit Designs (among other things) http://www.viatrack.ca

    void _-void-_ in the obvious place
     
    Boris Mohar, Feb 14, 2006
    #2
  3. When I broke off the knock sensor wire, I couldn't keep the car
    running. It would idle then die, or let me pump the gas and rev it up,
    then it would die. When I soldered the sensor back together it ran
    pretty well, but made a knock every so often.

    I think the mechanic heard this knock too. I bought a new sensor ($77),
    and we'll install it tomorrow. Mine had no plastic housing and was just
    metal and prongs.

    When I last spoke with him the compression check was 175, 175, 165 with
    one more to go.

    I hope the new sensor helps and he says the engine has more life.

    Just FYI, this mechanic is a friend of my neighbor who does this in his
    spare time and has many excellent references. When he mentioned the
    knock, it was when he came to pick up the car and trailer it to his
    house to fix it for me. It was a quick assessment.

    (fingers crossed)

    Jamie
     
    jamiebabineaux, Feb 15, 2006
    #3
  4. jamiebabineaux

    James Sweet Guest


    Ouch! You should have a look at this place
    http://catalog.alloemvolvoparts.com/

    Much more reasonable prices on that sort of thing.
     
    James Sweet, Feb 15, 2006
    #4
  5. Thanks!
    I hated paying premium, but when the car is on the rack and timing is
    critical, I bought it. But, I will definitely use this site in the
    future.

    IPDusa.com looked good, too, but the shipping looked a bit expensive.

    Thanks!
     
    jamiebabineaux, Feb 15, 2006
    #5
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