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Thread: False knock on 2002 S10 0411

  1. #16
    Fuel Injected! Terminal_Crazy's Avatar
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    Quote Originally Posted by NomakeWan View Post
    Hi Mitch, I would prefer if we didn't clutter this person's thread with unrelated topics, but to quickly answer your question, the log will give you data that makes zero sense.
    No probs, just curious.
    Mitch
    '95 Z28 M6 -Just the odd mod.
    '80 350 A3 C3 Corvette - recent addition.

  2. #17
    Electronic Ignition!
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    Any thoughts as to calculated knock as opposed to actual knock? Perhaps something that is based upon a correlation between map, maf and TPS to calculate engine load?

  3. #18
    Fuel Injected!
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    Does this 4.3l have 1 or 2 knock sensors? Most 4.3's I've seen use 2 knock sensors. I fought one before and turns out there was a 2nd one I didn't know about and if the ECM detects a problem in either knock sensor, it defaulted to minimum timing.
    1995 GMC K2500 SUBURBAN 2001 LB7 DURAMAX/ALLISON swap, mostly stock, tuned by me with EFILive

    1999 Tahoe 2 door 2X4, 5.7l with 0411 swap, and marine intake

  4. #19
    Electronic Ignition!
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    Quote Originally Posted by THEFERMANATOR View Post
    Does this 4.3l have 1 or 2 knock sensors? Most 4.3's I've seen use 2 knock sensors. I fought one before and turns out there was a 2nd one I didn't know about and if the ECM detects a problem in either knock sensor, it defaulted to minimum timing.
    Just the one. I was reading today about the map sensor values being used for fuel and timing tables. I have a couple of those here so I might just swap it to see if there any changes. I'm just having a hard time believing that the pcm is the issue because I've seen so many people shotgun parts including a pcm and it has never been a pcm.

    BTW, I remember you from dieselplace. Good to see that you're kicking around.

  5. #20
    Electronic Ignition!
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    Here is where we're at. I tried the knock sensor unmounted but plugged in. 0 knock with the exception of a knock count of 80 only when in 5th gear and 100% throttle. That tells me that my knock counts without the knock sensor hooked up were as I suspected. Completely false. As is my knock of 80 at WOT in 5th at 100% throttle. It is obvious that my low timing, -2 timing at tip in and mysterious knock counts are all in the programming. Could it be that this is a form of stick shift torque management?

    I do have to admit some shotgunning though because I did swap out the map sensor and tps just because I have known good ones. I feel good about both of those swaps though because even though they both tested good I found that the map sensor gasket was wrapped in teflon tape and the tps sensor wasn't an AC Delco.

    For the good of the community I'll post up something else interesting. I've never been able to find a replacement gasket for these map sensors. I noticed awhile ago that Harley Davidson map sensors looked to have the same gasket. As it turns out, they do!
    Last edited by Skylarkgp; 8 Hours Ago at 09:19 PM.

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