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Thread: Knock Sensor Tech "Topic of Week! 2/12/2012"

  1. #16
    RIP EagleMark's Avatar
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    Quote Originally Posted by gregs78cam View Post
    Have him also look up one for an application that is known to definitely have a '7747, and see if it is the same as one of the above. Then use the other one which will probably be for an Auto.

    Just like AutoZone: for 5.7
    SU154 - '88-90 both trans, '91-95 man. = '7747
    SU169 - '91-95 auto only = '6395, '8625, '7040, '7427

    I have a feeling that this will also tell us the answer to the question of a '95 5.7 man. '7427. It may not exist. If they say a '95 manual uses the same KS as a '7747, then a '95 man. ?must? be '7747.
    Well my son confirmed the knock sensor for 1995 5.7L Manual is same as 1990 1227747 C3 knock sensor.

    SO he is going to get the one listed for 1995 5.7L auto which we know is 16197427 with knock module in Memcal.

    If you ever see Kid-Neutron here give him a thanks for the research.

    1990 Chevy Suburban 5.7L Auto ECM 1227747 $42!
    1998 Chevy Silverado 5.7L Vortec 0411 Swap to RoadRunner!
    -= =-

  2. #17
    RIP EagleMark's Avatar
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    Here's a short list of knock sensors and ESC's

    ESC Module(GM #)..Knock Sensor(GM #) ..Known Applications

    16052391 .............10456287 .................5.0L V8
    16052401 .............10456288 .................5.7L V8
    16128261 .............10456288 .................5.7L V8
    16065711 .............10456288 .................4.3L V6, 5.7L V8
    16128251 .............10456288 .................4.3L V6, 5.7L V8
    16131171 .............10456288 .................7.4L V8

    1990 Chevy Suburban 5.7L Auto ECM 1227747 $42!
    1998 Chevy Silverado 5.7L Vortec 0411 Swap to RoadRunner!
    -= =-

  3. #18
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    305 truck sensor is probably close enough but if you're picky you can use a knock sensor from a 95 car with 3800. That engine has a 3.80" bore. Standard Ignition uses the same sensor for a pile of engines with 3.75" to 3.875" bores. Connecting knock sensors in parallel lowers total resistance of knock sensor circuit and lowers voltage sensed at memcal in ecm/pcm. Voltage range for code 43 can be adjusted in many cals and should be checked if using a cal from dual sensor 4.3 engine as it looks like GM used same sensor for single and dual applications. Older / low resistance KS can also be used by doing same trick. TGO and gnttype.org are two places to find good values for KS as Grumpy switched over to 7749 on his GN and retained old Buick KS. There are filter values in software which can be adjusted some to try and reduce false knock or increase sensitivity, and tricks like using teflon tape or mounting KS in pipe fittings instead of directly in block can help filter out unwanted vibration.
    Last edited by 1project2many; 02-13-2012 at 03:32 PM.

  4. #19
    Fuel Injected! JeepsAndGuns's Avatar
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    Humm...
    Might have to try a couple of those tricks when I get some time.
    79 Jeep Cherokee, AMC 401, T-18 manual trans, hydroboost, 16197427 MPFI system---the toy

    93 Jeep YJ Wrangler, 4.0L, 5 speed, 8.8 rear, homebrew hub conversion and big brakes, hydroboost, 2.5in OME lift, 31x10.50's---the daily driver

    99 Jeep WJ Grand Cherokee limited, 4.0L, auto, 2wd, leather and power everything, 99% stock---the long distance highway ride.

  5. #20
    RIP EagleMark's Avatar
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    Found this nifty little device/gauge while searching for knock info.
    http://www.casperselectronics.com/st...roducts_id=595

    And some plan to make your own!
    (see attachmant)
    Attached Files Attached Files

    1990 Chevy Suburban 5.7L Auto ECM 1227747 $42!
    1998 Chevy Silverado 5.7L Vortec 0411 Swap to RoadRunner!
    -= =-

  6. #21
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    Very cool and worth doing: Get a small amplifier like the one they advertise at 2 am on the tv for listening to other people's conversations. Tear the amp apart, disconnect it from the mic, and connect ity to the knock sensor instead to listen to the engine.

    It's amazing and surprising how much noise you'll hear.

  7. #22
    RIP EagleMark's Avatar
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    I' believe it. I've got a doctors stethoscope with metal rod, it's amazing at listening to an engine. If you have a noise in like alternator bearing or water pump you can't really pin down it will find it.

    1990 Chevy Suburban 5.7L Auto ECM 1227747 $42!
    1998 Chevy Silverado 5.7L Vortec 0411 Swap to RoadRunner!
    -= =-

  8. #23
    Fuel Injected! JeepsAndGuns's Avatar
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    What about the numbers on the ESC board inside memcals? Are they just diffrent numbers, or do the numbers actually represent diffrent esc's?
    I have 3 7427 memcals settin here on the computer desk. One is from a 350 auto ($0D BJYL) with a esc# 2265201. Next one is a 350 auto from a 95 P30 van, ($31 BNKM) esc# 234511? The last number is under some bubbles in the goo, kinda looks like either a 0 or 8. Last memcal is from a 4.3 tbi ($0D BDYT) esc# 1164141.

    Anyone have any more 7427 memcals they can compare?
    79 Jeep Cherokee, AMC 401, T-18 manual trans, hydroboost, 16197427 MPFI system---the toy

    93 Jeep YJ Wrangler, 4.0L, 5 speed, 8.8 rear, homebrew hub conversion and big brakes, hydroboost, 2.5in OME lift, 31x10.50's---the daily driver

    99 Jeep WJ Grand Cherokee limited, 4.0L, auto, 2wd, leather and power everything, 99% stock---the long distance highway ride.

  9. #24
    Fuel Injected! droptopstng's Avatar
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    hey just a thought we been putting ls7 ks in the ls1's to eliminate false knock, wonder if they would help any on older stuff???
    Wise man once said,better to stay silent and let others assume your and idiot than to open your mouth and prove it........and yes im an idiot lol

  10. #25
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    The blue or purple numbers under the clear goo on the ESC filter represent an engine family and a date code. They're usually only 5 digits IME. I have a small list of engine to filter number on my other pc. I'll try and dig it out when I have more time. I know of a few guys that have used LT4 knock filters instead of factory ones, but I don't know about the LS filters.
    Last edited by 1project2many; 02-15-2012 at 07:48 AM.

  11. #26
    Fuel Injected! droptopstng's Avatar
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    well im clueless just thought i would throw that piece in lol
    Wise man once said,better to stay silent and let others assume your and idiot than to open your mouth and prove it........and yes im an idiot lol

  12. #27
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    :) Yeah, but it's questions like that which make people think and try new stuff.

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