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Thread: knock sensor dead ?

  1. #1
    Supporting Member Turbo Mopar Contributor "Top Fuel" Bender's Avatar
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    knock sensor dead ?

    I was trying to log my knock sensor in MP Scan
    '89 SMEC Ostrich with SCI-USB cable (TI layout for MP Scan)

    I was logging KNKV (Knock Volts) and KNTHR (Knock Threshold)
    Noticed that my Knock Volts stayed at .02 volts no matter what RPM or Boost level I was at
    so I'm assuming this is a dead knock sensor

    also:
    is this the best way to log for knock ?
    compare knock volts to knock threshold ?
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  2. #2
    Garrett booster
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    Re: knock sensor dead ?

    Knock Volts should go up with RPM at least. So even in park, you should get *something* when revving to high rpm. Try swapping out the knock sensor and re-test.
    Having actual knock is when the knock volts is > than the knock threshold. Knock threshold is voltage vs RPM. Some calibrations change the knock threshold table.

    Jeff

  3. #3
    Hybrid booster Turbo Mopar Contributor shmedley's Avatar
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    Re: knock sensor dead ?

    Make sure the plug on the sensor is correct. On the super 60 harnesses the engine side of the connector was on the opposite pin in the plug. It never saw any knock that way...
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  4. #4
    turbo addict
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    Re: knock sensor dead ?

    Quote Originally Posted by shmedley View Post
    Make sure the plug on the sensor is correct. On the super 60 harnesses the engine side of the connector was on the opposite pin in the plug. It never saw any knock that way...
    Super 60 ECU doesn't use knock sensor nor o2 sensor.

  5. #5
    Boost, it's what's for dinner... Turbo Mopar Staff Aries_Turbo's Avatar
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    Re: knock sensor dead ?

    yes the knock volts increases with load/rpm. log the 4 cyl knock retards in addition to knock volts. RET1-RET4. that will tell you what cyl is knocking reliably.

    Brian

    Quote Originally Posted by turbovanman
    This one is easy, I have myself to blame, I rush things, don't pay attention to gauges when I should, change to much stuff at once then expect miracles, the list is endless.

  6. #6
    Supporting Member Turbo Mopar Contributor "Top Fuel" Bender's Avatar
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    Re: knock sensor dead ?

    Quote Originally Posted by jpcturbo View Post
    Knock Volts should go up with RPM at least. So even in park, you should get *something* when revving to high rpm. Try swapping out the knock sensor and re-test.
    Having actual knock is when the knock volts is > than the knock threshold. Knock threshold is voltage vs RPM. Some calibrations change the knock threshold table.

    Jeff
    that's what I thought
    I believe even tapping on the intake while it's running should produce something
    I'll have to swap it out and see what happens, hopefully it's not in the harness but it's only one wire so no big deal anyway

    Quote Originally Posted by shmedley View Post
    Make sure the plug on the sensor is correct. On the super 60 harnesses the engine side of the connector was on the opposite pin in the plug. It never saw any knock that way...
    this was a '89 Lancer harness I combined for Hoagie 20 years ago with an '88 Omni dash harness

    Quote Originally Posted by tryingbe View Post
    Super 60 ECU doesn't use knock sensor nor o2 sensor.
    I've heard that , and if I'm looking at the file correctly , it looks like they just maxed the threshold value so it'll never trigger knock

    Quote Originally Posted by Aries_Turbo View Post
    yes the knock volts increases with load/rpm. log the 4 cyl knock retards in addition to knock volts. RET1-RET4. that will tell you what cyl is knocking reliably.

    Brian
    cool , that's what I was thinking
    I did see the RET1-4 , guess that would be helpful too , If I get knock , I'll know where it's coming from
    I was trying not to clutter up what I was datalogging , but that export as CSV file really helps
    10's AGAIN '07, '08, '09
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